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CHAPTER 3 THEORY OF OPERATION

3-4

1.3.3 IEEE1284

Stores the data received from the PC into DRAM as controlled by the DMA controller. It is
applicable to both normal receiving and bi-directional communication (nibble mode, byte mode,
ECP mode).
74LVX161284, 3.3V 5.0V level shifter IC stores the pull-up resistance in signal wire at the
connector side

CDCC_D[2]

CDCC_D[3]

CDCC_D[4]

CDCC_D[5]

CDCC_D[6]

CDCC_D[7]

CDCC_D[0]

CDCC_D[1]

CDCC_D[7]

D[4]

CDCC_D[2]

D[0]

D[7-0]

CDCC_D[4]

CDCC_D[6]

D[3]

D[2]

D[6]

D[6]

CDCC_D[3]

D[0]

D[4]

D[5]

D[3]

D[1]

D[2]

D[7]

D[1]

D[7]

CDCC_D[5]

CDCC_D[0]

D[5]

CDCC_D[1]

5D

INITN

5D

SEINN

5D

HBUSY

5D

STBN

2B

CDCC_DIR

L

PC

Printer

H

Printer

PC

1B

INITN

1B

SEINN

1B

1B

HBUSY

STBN

1C

CDCC_D[7-0]

3A

CDCC_D[7-0]

2B

CDCC_HD

U7

Aurora

CDCCINITN

230

CDCCSINN

229

CDCCHBUSY

228

CDCCSTBN

227

CDCC_D0

240

CDCC_D1

239

CDCC_D2

238

CDCC_D3

235

CDCC_D4

234

CDCC_D5

233

CDCC_D6

232

CDCC_D7

231

CDCCACKN

245

CDCCBUSY

244

CDCCPEN

243

CDCCSLCT

242

CDCCFLTN

241

0V

0V

0V

CDC-.cir/3A

D[7-0]

0V

R131

33

ZD1

UDZS6.8B

R113

33

R119

33

R115

33

VDD5

CDC-.cir/2B

HBUSY_IN

CDC-.cir/2B

SELINN_IN

CDC-.cir/2B

INITN_IN

CDC-.cir/2B

STBN_IN

0V

VDD5

VDD3

C121

C103

C135

C103

C120

C103

C136

C103

CDC-.cir/1B

INITN_IN

CDC-.cir/1B

SELINN_IN

CDC-.cir/1B

STBN_IN

CDC-.cir/1B

HBUSY_IN

C115

C101

C116

C101

C118

C101

C119

C101

0V

CDC-.cir/3C

D[7-0]

C123

C101

C127

C101

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C101

C133

C101

C124

C101

0V

C132

C101

C130

C101

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C101

RA6

33

2

7

1

8

3

6

4

5

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33

2

7

1

8

3

6

4

5

IF_FG2

U11

74LVX161284

48

DIR

1

HD

34

GND

8

A1

9

A2

11

A3

12

A4

13

A5

14

A6

16

A7

17

A8

2

A9

3

A10

4

A11

5

A12

6

A13

20

A14

21

A15

22

A16

23

A17

19

PLHIN

24

HLH

18

VCC

7

VCC

31

VCC_CABLE

42

VCC_CABLE

10

GND

15

GND

39

GND

41

B1

40

B2

38

B3

37

B4

36

B5

35

B6

33

B7

32

B8

47

Y9

46

Y10

45

Y11

44

Y12

43

Y13

29

C14

28

C15

27

C16

26

C17

30

PLH

25

HLHIN

IF_FG

TP118

TP119

TP120

TP121

TP122

TP123

DA2

DF5A6.8FU

C3

C1

C2

A

C4

DA3

DF5A6.8FU

C3

C1

C2

A

C4

DA4

DF5A6.8FU

C3

C1

C2

A

C4 DA5

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C2

A

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0V

TP998

TP999

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18

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16

0V

17

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25

0V

21

0V

19

0V

22

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24

0V

20

0V

23

0V

26

0V

27

0V

28

0V

29

0V

30

0V

10

ACK

11

BUSY

12

PE

13

SELECT

32

FLT

14

ATFEED

36

SELIN

31

INPRIM

1

STB

2

DI1

3

DI2

4

DI3

5

DI4

6

DI5

7

DI6

8

DI7

9

DI8

15

NC

33

NC

34

NC

35

NC

37

FG

38

FG

NC

NC

NC

NC

Fig. 3-5

1.3.4 ROM

Fig. 3-6

«
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58
59
60
61
62
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Summary of Contents for DCP-8020

Page 1: ...SERVICE MANUAL MODEL MFC8420 8820D 8820DN DCP8020 8025D 8025DN Read this manual thoroughly before maintenance work Keep this manual in a convenient place for quick and easy reference at all times ...

Page 2: ...hange without notice Trademarks The brother logo is a registered trademark of Brother Industries Ltd Apple the Apple Logo and Macintosh are trademarks registered in the United States and other countries and TrueType is a trademark of Apple computer Inc Microsoft and MS DOS are registered trademarks of Microsoft Corporation Windows is a registered trademark of Microsoft Corporation in the U S and o...

Page 3: ... made up of six chapters and appendices CHAPTER 1 GENERAL CHAPTER 2 INSTALLATION AND BASIC OPERATION CHAPTER 3 THEORY OF OPERATION CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY CHAPTER 5 PERIODIC MAINTENANCE CHAPTER 6 TROUBLESHOOTING CHAPTER 7 MAINTENANCE MODE APPENDIX 1 EEPROM CUSTOMIZING CODES APPENDIX 2 INSTALLING THE UPDATE DATA APPENDIX 3 FIRMWARE SWITCHS WSW APPENDIX 4 CIRCUIT DIAGRAMS Information i...

Page 4: ...per tray 1 10 2 13 Printable Area 1 11 2 13 1 PCL5e EPSON IBM emulation 1 11 2 13 2 PCL6 BR Script3 emulation 1 14 2 14 Print Speeds with Various Settings 1 15 2 15 Toner Cartridge Weight Information 1 15 3 SERIAL NO DESCRIPTIONS 1 16 CHAPTER 2 INSTALLATION AND BASIC OPERATION 2 1 1 CONDITIONS REQUIRED FOR INSTALLATION 2 1 1 1 Power Supply 2 1 1 2 Environment 2 1 2 UNPACKING 2 2 3 INSTALL THE MACH...

Page 5: ...ck Diagram 3 2 1 3 Main PCB 3 3 1 3 1 CPU 3 3 1 3 2 USB 3 3 1 3 3 IEEE 1284 3 4 1 3 4 ROM 3 4 1 3 5 Flash ROM 3 5 1 3 6 SDRAM 3 5 1 3 7 Optional RAM 3 6 1 3 8 EEPROM 3 7 1 3 9 Reset circuit 3 7 1 3 10 Engine I O 3 7 1 3 11 Panel I O 3 7 1 3 12 Video I O 3 8 1 3 13 Scanner control 3 8 1 3 14 Power supply 3 9 1 4 Engine PCB 3 10 1 5 Power Supply 3 11 1 5 1 Low voltage power supply 3 11 1 5 2 High vo...

Page 6: ...ver Battery 4 17 3 6 Driver PCB Access Cover 4 18 3 7 ADF Unit 4 19 3 8 Document Scanner 4 28 3 9 Panel Unit 4 33 3 10 Rear Cover C MFC 8420 DCP 8020 only 4 36 3 11 Outer Chute MFC 8420 DCP 8020 only 4 37 3 12 Rear Cover MP ASSY Outer Chute MP ASSY MFC 8820D 8820DN DCP 8025D 8025DN only 4 38 3 13 Rear Cover L R 4 39 3 14 Side Cover L R 4 40 3 15 Joint Cover 4 41 3 16 Front Cover ASSY MFC 8420 DCP ...

Page 7: ...ing the Machine Exterior 5 14 3 2 Cleaning the Scanner 5 14 3 3 Cleaning the Printer 5 15 3 4 Cleaning the Drum Unit 5 16 3 5 Cleaning the Scanner Window 5 16 3 6 Cleaning the Electrical Terminals 5 17 4 MTBF MTTR 5 18 CHAPTER 6 TROUBLESHOOTING 6 1 1 INTRODUCTION 6 1 1 1 Initial Check 6 1 1 2 Warnings for Maintenance Work 6 2 1 3 Identify the Problem 6 3 2 ERROR MESSAGE 6 4 2 1 Error Message on th...

Page 8: ...6 60 10 10Windows 95 98 Me 2000 XP IPP Troubleshooting 6 60 10 11Novell Netware Troubleshooting 6 61 10 12AppleTalk Troubleshooting 6 62 10 13DLC LLC Troubleshooting 6 62 10 14Web Browser Troubleshooting TCP IP 6 62 10 15Internet Fax Troubleshooting 6 63 CHAPTER 7 MAINTENANCE MODE 7 1 1 ENTRY INTO THE MAINTENANCE MODE 7 1 2 LIST OF MAINTENANCE MODE FUNCTIONS 7 2 3 DETAILED DESCRIPTION OF MAINTENAN...

Page 9: ...e Data onto the Flash ROM of the Machine A 4 2 SETTING ID CODES TO MACHINES A 5 2 1 Connecting the Machine to Your PC A 5 2 2 Setting Up the Machine and Your PC A 5 2 3 Running the Setup Utility A 6 APPENDIX 3 FIRMWARE SWITCHS WSW A 7 APPENDIX 4 CIRCUIT DIAGRAMS 4 1 Main PCB Circuit Diagram 1 6 A 50 4 2 Main PCB Circuit Diagram 2 6 A 51 4 3 Main PCB Circuit Diagram 3 6 A 52 4 4 Main PCB Circuit Di...

Page 10: ...fter August 2 1976 Compliance is mandatory for products marketed in the United States One of the following labels on the back of the printer indicates compliance with the FDA regulations and must be attached to laser products marketed in the United States The label for Japanese manufactured products MANUFACTURED K BROTHER INDUSTRIES LTD 15 1 Naeshiro cho Mizuho ku Nagoya 467 8561 Japan This produc...

Page 11: ...er supply and laser unit Since the variable resistor in the laser unit is adjusted in accordance with the standards never touch it Caution Use of controls adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure For Finland and Sweden LUOKAN 1 LASERLAITE KLASS 1 LASER APPARAT Varoitus Laitteen käyttäminen muulla kuin tässä käyttö...

Page 12: ...it ACHTUNG Im Falle von Störungen der Lasereinheit muß diese ersetzt werden Das Gehäuse der Lasereinheit darf nicht geöffnet werden da sonst Laserstrahlen austreten können Location of the laser beam window ADDITIONAL INFORMATION When servicing the optical system of the printer be careful not to place a screwdriver or other reflective object in the path of the laser beam Be sure to take off any per...

Page 13: ...Listed below are the various kinds of WARNING messages included in this manual WARNING Always turn off the power switch and unplug the power cord from the power outlet before accessing any parts inside the printer WARNING Some parts inside the printer are extremely hot immediately after the printer is used When opening the front cover or back cover to access any parts inside the printer never touc...

Page 14: ...rt flap Front cover release button Manual feed tray MFC 8420 DCP 8020 Multi purpose tray MP tray MFC 8820D 8820DN DCP 8025D 8025DN ADF cover Telephone line jack USB interface connector Parallel interface connector External telephone line jack Paper adjustment lever for duplex printing MFC 8820D 8820DN DCP 8025D 8025DN Duplex tray MFC 8820D 8820DN DCP 8025D 8025DN AC power connector Face up output ...

Page 15: ...CHAPTER 1 GENERAL 1 2 Inside View Document Cover Open Fig 1 3 White film Scanner glass Document guidelines Glass strip Scanner lock lever Document cover ...

Page 16: ...uid Crystal Display 22 characters x 5 lines Warm up Max 18 seconds at 73 4 F 23 C Power Source 120V AC 50 60Hz U S A CANADA Version only Power Consumption Average Operating Copying 440 W or less 25 C Peak 1090 W or less Sleep 14 W or less Standby 75 W or less 25 C Dimensions 21 28 x 17 76 x 18 76 in 532 x 444 x 469 mm Weight Without Drum Toner Unit MFC 8420 DCP 8020 36 6 lb 16 6 kg MFC 8820D 8820D...

Page 17: ...lb 80 g m 2 plain paper Maximum multi purpose tray capacity Approx 50 sheets of 20 lb 80 g m 2 plain paper MFC 8820D 8820DN DCP 8025D 8025DN only Manual Feed Tray Multi Purpose Tray Paper size Width 20 lb 2 75 8 66 69 8 220 0 mm Height 4 60 16 00 116 0 406 4 mm Weight 16 43 lb 60 161 g m 2 Paper Output Up to 150 sheets of plain paper Face up print delivery to the output paper support 2 4 Copy Colo...

Page 18: ... 208 mm Printing Width 8 2 inches 208 mm Gray Scale 64 levels Polling Types Standard Sequential Contrast Control Automatic Light Dark manual setting Resolution Horizontal 203 dot inch 8 dot mm Vertical Standard 98 line inch 3 85 line mm Fine Photo 196 line inch 7 7 line mm Superfine 392 line inch 15 4 line mm One Touch Dial 40 20 x 2 Speed Dial 300 stations Automatic Redial One time Auto Answer 0 ...

Page 19: ...msec line ADF 1 01 msec line Scanner Glass NOTE Scanning directly to a networked PC is available with Windows 98 98SE Me 2000 Professional and XP OS X scanning is supported in OS X 10 2 1 or greater 2 7 Printer Emulation PCL6 Brother Printing System for Windows emulation mode of HP LaserJet and BR Script PostScript Level 3 Printer Driver Windows 95 98 98SE Me 2000 Professional XP and Windows NT Wo...

Page 20: ...e Expectancy Up to 20 000 pages drum unit DR 500 NOTE There are many factors that determine the actual drum life such as temperature humidity type of paper toner you use and number of pages per print job 2 10 Network LAN Board NC 9100h MFC 8420 8820D Option MFC 8820DN Standard DCP 8020 8025D Option When you add the optional Network LAN Board NC 9100h you can connect your MFC into the network to us...

Page 21: ...128 MB 80 MB 180 MB OS 8 6 9 2 Printing Scanning and PC FAX Send Only 32 MB 64 MB Apple Macintosh Operating System Mac OS X 10 1 10 2 1 or greater Printing Scanning 2 PC FAX Send and Remote Setup Only All base models meet minimum Requirements 128 MB 160 MB 50 MB 200 MB NOTE USB is not supported under Windows 95 or Windows NT WS 4 0 All registered trademarks referenced herein are the property of th...

Page 22: ...per Plain Paper Xerox 4200DP 20 lb Hammermill Laser Paper 24 lb Transparency 3M CG 3300 Labels Avery laser label 5160 2 12 3 Paper capacity of the paper trays Paper size Number of sheets Multi purpose tray MP tray MFC 8820D 8820DN DCP 8025D 8025DN Width 69 8 to 220 mm 2 75 to 8 66 in Height 116 to 406 4 mm 4 57 to 16 0 in 50 sheets 80 g m 2 or 20 lb Manual feed tray MFC 8420 DCP 8020 Width 69 8 to...

Page 23: ...d Transparency 2 Multi purpose tray N A 60 to 161 g m 2 16 to 43 lb Manual feed tray 60 to 161 g m 2 16 to 43 lb N A Paper tray 60 to 105 g m 2 16 to 28 lb Paper weights Optional lower tray 60 to 105 g m 2 16 to 28 lb Multi purpose tray N A Width 69 8 to 220 mm 2 75 to 8 66 in Height 116 to 406 4 mm 4 57 to 16 0 in Manual feed tray Width 69 8 to 220 mm 2 75 to 8 66 in Height 116 to 406 4 mm 4 57 t...

Page 24: ...bels with the carrier sheet exposed or the machine will be damaged Before loading paper with holes such as organizer sheets be sure to fan the stack well Do not use organizer sheets that are stuck together The glue that is used might caused damaged to the machine When printing on the back of pre printed paper if the paper is curled be sure to straighten the paper as much as possible Different type...

Page 25: ... mm 5 85 1 754 dots 93 0 mm 3 66 1 098 dots 148 5 mm 5 85 1 754 dots á 0 mm 4 2 mm 0 16 50 dots B 5 JIS 182 0 mm 7 1 2 130 dots 257 0 mm 10 11 3 033 dots 170 0 mm 6 69 2 007 dots 257 0 mm 10 11 3 033 dots á 0 mm 4 2 mm 0 16 50 dots B 5 ISO 176 0 mm 6 93 2 078 dots 250 0 mm 9 84 2 952 dots 164 0 mm 6 46 1 936 dots 250 0 mm 9 84 2 952 dots á 0 mm 4 2 mm 0 16 50 dots B 6 ISO 125 0 mm 4 92 1 476 dots ...

Page 26: ...8020 8025D 8025DN SERVICE MANUAL 1 13 Landscape A B C D E F G F G E G G Physical page Printable area Logical page B Physical page length D Maximum logical page length F Distance from edge of physical page to edge of logical page ...

Page 27: ...3 1 240 dots á 0 mm 4 2 mm 0 16 50 dots B 5 JIS 257 0 mm 10 11 3 033 dots 182 0 mm 7 1 2 130 dots 247 0 mm 9 72 2 916 dots 182 0 mm 7 1 2 130 dots á 0 mm 4 2 mm 0 16 50 dots B 5 ISO 250 0 mm 9 84 2 952 dots 176 0 mm 6 93 2 078 dots 240 0 mm 9 44 2 834 dots 176 0 mm 6 93 2 078 dots á 0 mm 4 2 mm 0 16 50 dots B 6 ISO 176 0 mm 6 93 2 078 dots 125 0 mm 4 92 1 476 dots 166 4 mm 6 55 1 960 dots 125 0 mm...

Page 28: ... and paper tray NOTE When a smaller size paper than A4 or Letter is printed the temperature on both edges of the fixing unit is much higher than the temperature on the center of the unit where the paper is fed depending on the setting or model Therefore the print speed is slowed in order to decrease the temperature on the edges after the specified time it is maximum print speed when you first star...

Page 29: ... 2004 ID for factory 9 Kariya Plant A Mie Brother C BIUK J Buji Nan Ling Factory 1 Machine Printed on the label attached on the rear of the main body Example U 6 0 6 6 1 E 3 J 1 1 1 0 1 1 2 Process unit Imprinted on the aluminum bag Drum unit with toner cartridge 3 A 1 1 J A 3 Drum unit Printed on the bar code label attached inside the drum unit A 3 9 5 1 0 0 1 0 4 A YEAR MONTH DATE FACTORY ID NO ...

Page 30: ...ar code label attached on the toner cartridge M 3 9 A 0 0 0 1 9 9 A 5 Laser unit On the laser unit 2 8 0 0 1 YEAR MONTH DATE FACTORY ID NO YEAR MONTH SERIAL NO PRODUCTION LOT NO LASER UNIT NO 8 LJ7516001 Laser Unit ZL2 FACTORY ID NO FACTORY ID NO CARTRIDGE PRODUCTION INFO 1 Kariya Plant 2 Buji Nan Ling Factory TONER VOLUME PRODUCT LINE NO ...

Page 31: ...d between 10 C and 32 5 C The relative humidity is maintained between 20 and 80 The machine should be used in a well ventilated room Place the machine on a flat horizontal surface Keep the machine clean Do not place the machine in a dusty place Do not place the machine where the ventilation hole of the machine is blocked Keep approximately 100 mm 4 inches between the ventilation hole and the wall ...

Page 32: ...8025DN 4 Paper Tray 5 Front Cover 6 Power Switch 7 Document Cover 8 Automatic Document Feeder ADF 2 MFC 5 6 7 8 Fig 2 1 Carton components may differ from one country to another Save all packing materials and the carton NOTE The interface cable is not a standard accessory Please purchase the appropriate interface cable for the interface you intend to use Parallel or USB For Parallel use a bi direct...

Page 33: ...up and driver installation are contained on the supplied CD ROM 3 1 For All Users For Windowsâ â â â users 1 Turn on the PC power Insert the supplied CD ROM into the CD ROM drive The opening screen will appear automatically Follow the on screen instructions NOTE If the opening screen does not appear click Start and select Run Then enter the CD drive letter and type START EXE for example D START EX...

Page 34: ...CHAPTER 2 INSTALLATION AND BASIC OPERATION 2 4 3 1 1 Install the Automatic Document Feed ADF support 1 Open the ADF cover Fig 2 2 Fig 2 3 2 Slide ADF support into the groove on ADF Fig 2 4 ADF cover ...

Page 35: ...the front cover by pressing the front cover release button 2 Unpack the drum unit assembly Remove the protective part 3 Rock it from side to side several times to distribute the toner evenly inside the assembly Fig 2 6 4 Push the drum unit assembly into the machine until it snaps into place Fig 2 7 5 Close the front cover of the machine ...

Page 36: ... on the tray Fig 2 8 NOTE For Legal size paper press the universal guide release button and pull out the back of the paper tray 3 Fan the stack of paper well to avoid paper jams and misfeeds 4 Put paper in the paper tray Check that the paper is flat in the tray and below the maximum paper mark Fig 2 9 5 Put the paper tray firmly back in the machine and unfold the support flap before you use the ma...

Page 37: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 2 7 3 1 4 Release the scanner lock 1 Push the lever up to unlock the scanner Refer to Fig 2 11 Fig 2 11 Scanner lock lever ...

Page 38: ... Bridge PC FAX software Remote Setup and True Type fonts PaperPort is a document management application for viewing scanned documents ScanSoft TextBridge which is integrated into PaperPort is an OCR application that converts an image into text and inserts it into your default word processor 6 Click Install NOTE If you see the following screen click OK to install the Windows updates After the updat...

Page 39: ...ically start Follow the instructions on the screen 18 Select BRUSB USB Printer Port and then click Next 19 Accept the default Printer name by selecting Yes and then click Next 20 Select Yes recommended and then click Finish A test page will be printed so you can check the print quality 21 If the test page is printed correctly click Yes If you click No follow the prompts on the screen to correct th...

Page 40: ...abled NOTE Even if you select NO later you will be able to launch the Brother Control Center to use the Scan to key by double clicking the Smart UI icon on the desktop This loads the Brother Control Center to the task tray See AutoLoad the Brother Control Center Chapter 15 in the Documentation User s Guide located on the CD ROM OK This completes the installation of the Windows Logo Tested WHQL pri...

Page 41: ...stalled and the installation is now complete For Windows XP Users Only Make sure that you followed the instructions in 1 to 16 on pages 2 8 to 2 9 17 When this screen appears connect the USB interface cable to your PC and then connect it to the machine Turn on the machine by plugging in the power cord Turn the power switch on It will take a few seconds for the installation screen to appear The ins...

Page 42: ...Open 26 Make sure X WXP Addprt is displayed in the window and click OK X is the drive your CD ROM 27 Highlight the model you are installing from the list of machines and click Next 28 The model you are installing will be listed in the window Select Yes or No if you want this driver to be your default printer 29 Select Do not share this printer and Next 30 Select Yes and Next to print a test page 3...

Page 43: ...perPort is an OCR application that converts an image into text and inserts it into your default word processor 6 Click Install NOTE If you see the following screen click OK to install the Windows updates After the updates are installed your PC may restart If it does the installation will automatically continue If the installation does not continue automatically please open the installer menu again...

Page 44: ...k Yes to have the Brother MFL Pro Control Center load each time Windows is started The Control Center will appear as an icon in the task tray If you click No the Scan keys on the machine will be disabled NOTE Even if you select NO later you will be able to launch the Brother Control Center to use the Scan to key by double clicking the Smart UI icon on the desktop This loads the Brother Control Cen...

Page 45: ...iver offers some features that are not available with the Windows Logo Tested Driver To install the Brother Native driver proceed to step 21 Brother Native driver Installation 24 Click Start and select Settings and then Pointers Click on Add a printer and the Add Printer Wizard will start When this screen appears click Next 25 Un check the Automatically detect and install my Plug and Play printer ...

Page 46: ...ollowing screen appears click Finish and wait as the PC restarts Windows and continues the installation OK This completes the installation of the Windows Logo Tested WHQL printer driver and the Brother PC FAX and scanner drivers Brother also offers a Native Driver on the CD ROM The Brother Native Driver offers some features that are not available with the Windows Logo Tested Driver To install the ...

Page 47: ...ter 29 Select Do not share this printer and Next 30 Select Yes and Next to print a test page 31 When this screen appears click Finish 32 When the Windows Logo testing screen appears click Continue Anyway NOTE There will be two Brother printer drivers listed in the Printers selection The driver with Printer after the model name ex Brother MFC 8820D Printer is the Brother Native Driver OK The Brothe...

Page 48: ...erPort is an OCR application that converts an image into text and inserts it into your default word processor 7 Click Install NOTE If you see the following screen click OK to install the Windows updates After the updates are installed your PC may restart If it does the installation will automatically continue If the installation does not continue automatically please open the installer menu again ...

Page 49: ...your computer 20 After the computer restarts click Yes to have the Control Center load each time Windows is started The Control Center will appear as an icon in the task tray If you click No the Scan keys on the machine will be disabled NOTE Even if you select NO later you will be able to launch the Brother Control Center to use the Scan to key by double clicking the Smart UI icon on the desktop T...

Page 50: ...aperPort is an OCR application that converts an image into text and inserts it into your default word processor 6 Click Install NOTE If you see the following screen click OK to install the Windows updates After the updates are installed your PC may restart If it does the installation will automatically continue If the installation does not continue automatically please open the installer menu agai...

Page 51: ...our network and then click OK e g Enter 10 134 43 79 for IP Address 21 Click Next NOTE See the For Administrator section of this guide or the NC 9100h User s Guide located on the CD ROM for more network configuration information Windows 98 Me 2000 XP Users Go to 22 Windows 95 NT Users Go to 24 22 Select yes and then click Next 23 Click Next or enter the name you want displayed on the LCD for your ...

Page 52: ...launch the Brother Control Center to use the Scan to key by double clicking the Smart UI icon on the desktop This loads the Brother Control Center to the task tray See AutoLoad the Brother Control Center Chapter 15 in the Documentation User s Guide located on the CD ROM OK For Windows 98 Me 2000 Users The Brother PC FAX Printer and Scanner drivers have been installed and the installation is now co...

Page 53: ...ted restart your Macintosh 7 Connect the USB interface cable to your Macintosh and then connect it to the machine Caution Do not connect the machine to a USB port on a keyboard or a non powered USB hub 8 Turn on the machine by plugging in the power cord Turn the power switch on 9 From the Apple menu open the Chooser 10 Click the Brother Laser icon you installed On the right side of the Chooser sel...

Page 54: ...nd then connect it to the machine Caution Do not connect the machine to a USB port on a keyboard or a non powered USB hub 7 Turn on the machine by pluging in the power cord Turn the power switch on 8 Select Applications from the Go menu 9 Open the Utilities folder 10 Open the Printer Center icon 11 Click Add Printer 12 Select USB 13 Select MFC XXXX and then click Add 14 Select Quit Printer Center ...

Page 55: ...re icon to install the printer scanner and PC FAX Send drivers If the language screen appears select your language 5 Click MFL Pro Suite for your country to install 6 After the installation is completed restart your Macintosh 7 Connect the network interface cable to the printer and then connect it to a free port on your hub 8 Turn on the machine by plugging in the power cord Turn the power switch ...

Page 56: ...ars select your language 5 Click MFL Pro Suite to install 6 Connect the network interface cable to the printer and then connect it to a free port on your hub 7 Turn on the machine by plugging in the power cord Turn the power switch on 8 Select Applications from the Go menu 9 Open the Utilities folder 10 Open the Print Center icon 11 Click the Add Printer button 12 Select AppleTalk 13 Select BRN_xx...

Page 57: ...ontrol panel Printer data Fax data Low and high voltage power supplies AC Paper feeding mechanism Laser printing unit Provided on models supporting facsimile function Charging exposing developing transferring and heat fixing processes Electrical charger Laser unit including the polygon motor Laser sensitive drum Developer roller Transfer roller Heater roller Main motor Scanner unit ADF unit NCU Li...

Page 58: ...8MB 16MB RAM DIMM max 128MB EEPROM 512 x 8 bit 8192 x 8 bit CPU Core SPARClite 133MHz A S I C Oscillator 66 6MHz Address Decoder DRAM Control Timer FIFO CDCC Parallel I O Soft Support EEPROM I O Engine Control I O To Engine PCB BUS INT To PC USB I O To PC Network Program 1 5 MB STRAGE 0 5 MB PCI Bus Control Scanner Controller CCD unit Oscillator 12MHz Fig 3 2 ...

Page 59: ...k VDD3 3 3C SDCKE1 C77 C101 0V R60 10k R59 10k R30 10k R31 10k R32 10k R25 10k R29 10k R49 10k R53 10k R27 10k R26 10k R51 10k R50 10k R52 10k R48 10k VDD3 0V 0V TP6 TP7 TP8 TP9 TP5 TP2 TP3 TP35 TP36 TP37 TP10 TP11 TP12 TP13 TP14 TP15 TP16 TP17 R78 0 TP26 TP29 TP30 TP31 TP32 TP33 TP195 TP196 TP197 TP198 R33 10k R54 10k R62 10k TP700 TP701 TP702 TP703 TP705 R61 10k R79 4 7k R76 4 7k 0V TP722 TP723 ...

Page 60: ...5 CDC cir 2B HBUSY_IN CDC cir 2B SELINN_IN CDC cir 2B INITN_IN CDC cir 2B STBN_IN 0V VDD5 VDD3 C121 C103 C135 C103 C120 C103 C136 C103 CDC cir 1B INITN_IN CDC cir 1B SELINN_IN CDC cir 1B STBN_IN CDC cir 1B HBUSY_IN C115 C101 C116 C101 C118 C101 C119 C101 0V CDC cir 3C D 7 0 C123 C101 C127 C101 C129 C101 C133 C101 C124 C101 0V C132 C101 C130 C101 C126 C101 RA6 33 2 7 1 8 3 6 4 5 RA5 33 2 7 1 8 3 6 ...

Page 61: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 3 5 1 3 5 Flash ROM A 16Mbit flash ROM x 16bit is fitted Fig 3 7 1 3 6 SDRAM Fig 3 8 ...

Page 62: ... 1 6C 1 7A 1 7F 2E 4 6E ADR 18 CASN 1 8C 7D 4 7E DQ 31 0 0V 0V 0V 0V C51 C47 C131 C97 C79 C114 C98 C81 C103 C103 C103 C103 C103 C103 C103 C103 C103 C117 18 A10 AP A10 14 A2 60 DQ15 43 DQ20 3 DQ1 38 DQ16 49 SCL 66 A7 58 DQ13 67 A9 68 BA0 A11 13 A0 54 DQ10 53 DQ9 79 SN1 RASN1 E1 91 DQ27 99 SA1 40 DQ18 94 DQ29 20 A12 NotUse A14 70 A13 NotUse A15 69 A11 A13 4 DQ2 10 DQ7 100 SA2 90 DQ26 17 A8 9 DQ6 30 ...

Page 63: ...VDD3 C71 C103 TP310 Fig 3 11 1 3 10 Engine I O The interface with the engine PCB is by full duplex synchronous serial method of which transfer rate is 520kbps 3D ENGDI 1D ENGDI ENGDI U7 Aurora 254 ENGRSTN 253 ENGDO 255 R139 4 7k VDD5 VDD3 R140 4 7k L11 0 VDD3 0V C143 C102 R141 100 C152 C103 C154 C103 C153 C101 C142 C101 L10 0 L15 0 L14 0 L12 0 L13 0 R142 1k R138 100 TP202 TP203 TP200 TP201 TP204 T...

Page 64: ...N0 2D ENBN0 VDD5 L7 0 VDD5 L6 0 R21 680 C22 C102 VDD5 R7 220k R13 100 C27 C471 Q3 C3735 C B E R8 1k VDD3 R19 680 0V 0V L5 0 0V L3 0 L4 0 VDD3 R16 680 R15 330 1 10W 0V 0V C21 C103 C18 C103 C23 C101 C20 C270 1 BD CN1 5 DATA1 2 ENB1 3 5V 4 GND R10 0 R12 0 TP230 TP231 TP232 TP233 TP234 TP235 U2 TC7SH08FU 1 B 4 Y 5 VCC 2 A 3 GND VDD3 R151 330 1 10W Fig 3 14 1 3 13 Scanner control Fig 3 15 ...

Page 65: ...ition 1 9V is generated by the 3 pin regulator from 3 3V supplied from the LVPS 1 9V is used for the CPU within the ASIC and the logic circuit VDD7 D2 RB751V 40 0V VDD5 Q6 NJM2391DL1 19 OUT VCC GND C157 C22 16V C151 C104 FG1 OT1 C140 C10 16V C158 C104 VDD7 0V C141 C220 6 3V 6V VDD3 B3B EH 1 3V CN8 2 7V 3 0V C138 C220 6 3V 6V VDD3 C128 C104 0V VDD1 8 Q5 NJU7223DL1 19 1 OUT 2 VCC 3 GND C137 C104 C12...

Page 66: ...oltage power supply Lower paper exist sensor Toner sensor Lower cassette exist sensor Cover sensor Paper eject sensor Front registration sensor Fixing unit cover sensor Rear registration sensor Multi purpose tray paper exit sensor For the circuit diagram of the engine PCB see APPENDIX 4 8 and 4 9 ENGINE PCB CIRCUIT DIAGRAM in this manual Sensor configuration varies according to machine types DCP 8...

Page 67: ...om the AC line The regulated output is listed below Regulated Output 3 3V 1 5A 8V 0 4A 24V 2 2A For the circuit diagram of the low voltage power supply PCB see APPENDIX 4 15 or 4 16 LOW VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM in this manual Heater Circuit Thermal Fuse Feedback Line Filter Fuse Rectifier Oscillator 24V Regulation Circuit 24V 3 3V Lamp Heater Engin Circuit Main Circuit 3 3V Regulat...

Page 68: ...cuit diagram of the high voltage power supply PCB see APPENDIX 4 17 or 4 18 HIGH VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM in this manual Transfer Roller Supply Roller Photosensitive Drum Development Roller Corona Unit Current Regulator Current Regulator Voltage Regulator Voltage Regulator B1 B201 Q205 B251 Q253 Voltage Regulator Z101 VR101 VR52 24VI GND VR251 Voltage Regulator VR102 Cleaning Brush...

Page 69: ...or Separation pad Pressure roller Paper pick up roller DRUM UNIT Scanner motor LASER UNIT Corona wire Heat roller Second eject roller Outer chute MP Pressure plate Paper Feed roller Paper feed pinch roller Rear cover First feed roller First feed pinch roller Regist front actuator Supply roller Development roller Blade PAPER TRAY First eject roller FIXING UNIT Pressure roller DX feed ASSY ...

Page 70: ...ent cover and start the scanning operation then the CCD drive mechanism will be driven That is the CCD motor rotates and its rotation will be transmitted via the gear train to the CCD drive belt The CCD unit which is supported and guide by the CCD rail is secured to the CCD drive belt Clockwise and counterclockwise rotations of the CCD motor move the CCD unit to the right and left respectively In ...

Page 71: ... the paper top position absence of paper is detected by sensing the motion of the actuator 2 3 2 Paper registration After the paper top position is detected by the regist front actuator the paper separated into individual sheets by the paper pick up roller is fed further for a specified time and the paper top position reaches the paper feed roller so that the paper skew is adjusted Then the soleno...

Page 72: ...o the printer rear straight paper path Fig 3 23 2 3 4 Duplex printing After the paper exits from the second eject roller with the front of sheet printed the second eject roller rotates conversely and feeds the paper to the duplex tray where the paper skew is adjusted Afterwards the paper is ejected from the duplex tray to the path through the paper feed roller and the transfer roller to the transf...

Page 73: ...r in the toner cartridge The toner sensor at the left side emits light through the window on the left side of the toner cartridge then the toner sensor at the right side receives it when the toner is low They also detect whether or not the drum unit is installed The toner cartridge is installed in the drum unit Fig 3 25 Toner sensor Light emission Toner sensor Light reception Front cover sensor ...

Page 74: ... Detect if the paper tray is installed They also detect if there is paper in the paper tray Fig 3 26 2 4 4 Paper eject sensor Detects if paper is ejected from the fixing unit Fig 3 27 Paper empty sensor Eject sensor PCB ASSY Cassette sensor PCB ASSY Cassette sensor Fixing unit ...

Page 75: ...0D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 3 19 2 4 5 MP PE sensor Detects if there is paper in the MP tray Fig 3 28 2 4 6 Document cover sensor Fig 3 29 Feed MP unit MP PE sensor PCB ASSY Document cover sensor ...

Page 76: ...CHAPTER 3 THEORY OF OPERATION 3 20 2 4 7 Document front sensor Document rear sensor Fig 3 30 2 4 8 DX sensor PCB ASSY Fig 3 31 Document front sensor Document rear sensor DX sensor PCB ASSY ...

Page 77: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 3 21 2 4 9 Rear cover sensor Fig 3 32 2 4 10 HP sensor Fig 3 33 Rear cover sensor HP sensor ...

Page 78: ...Charging The drum is charged to approximately 870V by an ion charge which is generated by the primary charger The charge is generated by ionization of the corona wire which has a DC bias from the high voltage power supply applied to it The flow of the ion charge is controlled by the grid to ensure it is distributed evenly on the drum surface The aluminum drum sleeve in the photosensitive drum is g...

Page 79: ...o be printed The surface potential of the exposed area is reduced forming the electrostatic image to be printed Fig 3 36 Drum Lens Laser beam Polygon mirror Paper Laser detector Laser diode Motor Laser beam f θ lens 3 Primary charging Laser beam exposure and developing a Unexposed area Non image area b Exposed area Image area Transfer the image to paper Time Drum sleeve 0 2 1 1 2 3 a b 150 400 870...

Page 80: ...ctrostatic potential to attract toner particles from the development roller to the latent image area on the drum surface Fig 3 37 2 7 4 Transfer 1 Transfer process After the drum has been charged and exposed and has received a developed image the toner formed is transferred onto the paper by applying a negative charge to the back of the paper The negative charge applied to the paper causes the pos...

Page 81: ...xed by heat and pressure when passing through the heat roller and the pressure roller in the fixing unit The thermistor keeps the surface temperature of the heat roller constant by detecting the surface temperature of the heat roller and turning on or off the halogen heater lamp Fig 3 38 First eject roller Thermistor Pressure roller Heat roller ...

Page 82: ...this chapter 3 When using soldering irons or other heat generating tools take care not to accidentally damage parts such as wires PCBs and covers 4 Before handling any PCBs touch a metal portion of the equipment to discharge any static electricity charge on your body or the electronic parts or components may be damaged 5 When transporting PCBs be sure to wrap them in the correct protective packagi...

Page 83: ...TTERY 7 ADF UNIT 9 PANEL UNIT 8 DOCUMENT SCANNER REAR COVER L R SIDE COVER L R 14 MAIN PCB 22 FRONT COVER ASSY MFC 8420 DCP 8020 only 16 MP UNIT MFC 8820D 8820DN DCP 8025D 8025DN only REVERSING RELEASE SOLENOID MFC 8820D 8820DN DCP 8025D 8025DN only DX SENSOR PCB ASSY MFC 8820D 8820DN DCP 8025D 8025DN only 17 BASE PLATE LV INSULATION SHEET 23 LASER UNIT 21 FRAME L DRIVE UNIT FAN MOTOR 60 UNIT LV F...

Page 84: ...020 8025D 8025DN SERVICE MANUAL 4 3 3 DISASSEMBLY PROCEDURE 3 1 AC Cord 1 Disconnect the AC cord from the machine Fig 4 1 3 2 Drum Unit 1 Open the front cover and remove the drum unit Fig 4 2 AC cord Machine Drum unit Front cover ...

Page 85: ...ray 1 Close the front cover and pull out the paper tray 2 Remove the paper from the paper tray Fig 4 3 3 Remove the pad holder and the separation pad spring from the paper tray Fig 4 4 Front cover Paper tray Pad holder Separation pad spring Paper tray 1 2 ...

Page 86: ...d grease and apply a suitable amount of grease referring to the figure below Fig 4 5 4 Remove the four bind B M4x12 Taptite screws and then remove the paper tray front cover Fig 4 6 Paper tray Paper pick up roller Grease Molykote PG 662 4 mm dia ball Taptite bind B M4x12 Taptite bind B M4x12 Paper tray front cover Paper tray Hook Hook ...

Page 87: ...move the two cup B M3x10 Taptite screws and then remove the paper tray cover Fig 4 7 6 Remove the pressure roller holder Fig 4 8 Paper tray Taptite cup B M3x10 Paper tray cover Flat screwdriver Pressure roller holder Paper tray Taptite cup B M3x10 ...

Page 88: ...move the scratch spongy holder ASSY from the pressure roller holder 10 Remove the two scratch spongy springs 11 Remove the scratch spongy from the scratch spongy holder ASSY Fig 4 10 Pressure roller shaft Pressure roller holder ASSY Scratch spongy Scratch spongy holder ASSY Pressure roller holder Scratch spongy springs 1 2 Pressure roller collar ...

Page 89: ... and then unhook the catches of the two side guide racks Fig 4 11 14 Remove the side guides right and left from the paper tray Fig 4 12 Taptite cup M2 6x5 Taptite cup M2 6x5 Side guide rack Lock lever Paper tray Catches Paper tray Side guide L Side guide R Side guide L Side guide L 2 2 1 2 1 2 1 Side guide rack ...

Page 90: ... unhook the other two catches B of the plate while pulling the plastic frame outwards to remove the pressure plate ASSY Fig 4 13 16 Unhook the pressure plate spring from the plastic hook to remove the two pressure plate springs Fig 4 14 Pressure plate ASSY Plastic frame Catches A Paper tray Paper tray Pressure plate spring Pressure plate spring Catch B Hook ...

Page 91: ...ate do not bend the pressure plate gently ease the plastic cover If the pressure plate is deformed paper feeding problems may occur 17 Remove the herical extension spring 18 Remove the lock lever Fig 4 15 NOTE When re assembling the lock lever insert it upwards from underneath the cassette and rotate it until the two catches lock into place Herical extension spring Lock lever 1 2 3 Paper tray Pape...

Page 92: ...p B M3x8 Taptite screw and then remove the side guide gear and the friction spring 20 Remove the two side guide racks Fig 4 16 21 Remove the paper indicator Fig 4 17 Side guide rack Side guide rack Paper tray Paper indicator Taptite cup B M3x8 Side guide gear Friction spring 2 1 1 ...

Page 93: ...bling the paper cassette remove the old grease and apply a suitable amount of grease onto both sides of the paper tray referring to the figure below Fig 4 18 22 Remove the pan B M3x8 Taptite screw and then remove the tray lock lever 23 Unhook the four hooks to remove the paper tray rear from the paper tray Fig 4 19 Taptite pan B M3x8 Tray lock lever Paper tray Hook Paper tray rear Paper tray Greas...

Page 94: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 4 13 24 Remove the paper rear guide Fig 4 20 Paper tray Paper rear guide 2 1 1 ...

Page 95: ... 4 21 2 Remove the four bind B M3x8 Taptite screws and then remove the DX roller holder and three pressure rollers 3 Remove the three pressure roller springs Fig 4 22 DX feed ASSY Tray feed ZL2 Pressure roller Pressure roller spring Taptite bind B M3x8 Taptite bind B M3x8 Pressure rollers Pressure roller springs DX roller holder ...

Page 96: ... holder Fig 4 23 4 Remove the two bind B M3x8 Taptite screws and then remove the guide plate stopper 5 Remove the two left guide spring 2 Fig 4 24 Left guide spring 2 Taptite bind B M3x8 Taptite bind B M3x8 Guide plate stopper Guide plate stopper Left guide spring 2 Left guide spring 2 Tray feed ZL2 Tray feed ZL2 Pressure roller Pressure roller spring ...

Page 97: ...4 25 8 Remove the DX feed roller drive gear 14 two side regist rollers T belt S and ground wire 9 Remove the guide actuator and T belt L Fig 4 26 Tray feed ZL2 DX paper switch pull arm Left guide plate ASSY Side regist guide DX feed roller T belt S T belt L Drive gear 14 Tray feed ZL2 Hooks 1 2 3 Guide actuator Ground wire Side regist rollers ...

Page 98: ... Remove the access cover 2 Loosen the two access plate screws 3 Remove the access plate Fig 4 27 4 Disconnect the connector and then remove the battery MFC 8420 8820D 8820DN only Fig 4 28 Access cover Hooks Hooks Hooks Hooks Access plate Access plate screw Access plate screw Battery Main PCB ...

Page 99: ...PTER 4 DISASSEMBLY AND RE ASSEMBLY 4 18 3 6 Driver PCB Access Cover 1 Remove the bind B M4x12 Taptite screw and then remove the driver PCB access cover Fig 4 29 Driver PCB access cover Taptite bind B M4x12 ...

Page 100: ... 1 Remove the document tray ASSY Fig 4 30 2 Disconnect the three connectors 3 Remove the cup B M3x10 Taptite screw and then remove the ground wire Fig 4 31 Taptite cup B M3x10 Ground wire Connector Connector Connector Main PCB Driver PCB ASSY Document tray ASSY Hooks Hooks 1 2 ...

Page 101: ...ase R 6 Remove the three cup B M3x10 Taptite screws and then remove the hinge arm R 7 Remove the three cup B M3x10 Taptite screws and then remove the hinge ASSY L Fig 4 33 Document cover Taptite cup B M3x10 Taptite cup B M3x10 Taptite cup B M3x10 Hinge base R Hinge arm R Hinge ASSY L Document cover LGL 1 2 Hinge arm R Hinge base R Taptite bind B M4x12 ...

Page 102: ...d spring 9 Remove the two cup B M3x10 Taptite screws and then remove the rear sensor cover Fig 4 34 10 Remove the ADF cover Fig 4 35 Document hold ASSY Taptite cup B M3x10 Rear sensor cover ADF cover Document hold spring Document hold ASSY Hooks Hooks Hook 1 2 3 4 2 1 Document cover LGL Document hold spring Hooks ...

Page 103: ... the cup B M3x10 Taptite screw and then remove the side cover F 13 Remove the cup B M3x10 Taptite screw and then remove the side cover R Fig 4 37 Document ejection tray Document cover LGL Side cover F Side cover R Taptite cup B M3x10 Taptite cup B M3x10 Hook Hook Document cover LGL 2 1 3 4 Hook Hook ...

Page 104: ...he ADF chute ASSY Fig 4 38 17 Remove the conductive bushing and then remove the PF roller holder ASSY 18 Remove the conductive bushing and then remove the LF roller 1 ASSY Fig 4 39 Document cover LGL Taptite cup B M3x10 Taptite cup B M3x10 ADF chute ASSY Conductive bushings LF roller 1 ASSY PF roller holder ASSY ADF chute ASSY Conductive bushing ADF motor ADF relay PCB ASSY Taptite cup S M3x6 Grou...

Page 105: ...Y 21 Remove the two pan S P washer M3x8 screws and then remove the ADF motor Fig 4 40 22 Remove the four cup B M3x10 Taptite screws and then remove the paper feed chute ASSY Fig 4 41 ADF chute ASSY Taptite cup S M3x6 ADF relay PCB ASSY ADF motor Pan S P washer M3x8 Taptite cup S M3x6 Motor frame ASSY Taptite cup B M3x10 Taptite cup B M3x10 Paper feed chute ASSY PF roller holder ASSY Taptite cup S ...

Page 106: ...ing 26 Remove the two pressure rollers and pressure roller shaft S Fig 4 42 27 Remove the front sensor actuator ASSY and document front sensor Fig 4 43 Taptite bind B M3x6 Pressure rollers Spring plate ADF front A ASSY Separation rubber Rubber holder Pressure roller shaft S Front sensor actuator ASSY Connector Paper feed chute Document front sensor Paper feed chute Compression spring ADF film Hook...

Page 107: ... the two cup S M3x10 Taptite screws and then remove the two LF springs 32 Remove the two pressure rollers and pressure roller shaft S Fig 4 45 LF roller 2 ASSY Conductive bushing Ejection roller ASSY Taptite cup S M3x10 Pressure rollers Pressure rollers Pressure roller shaft S Pressure roller shaft S LF springs Pressure rollers Pressure rollers Pressure roller shaft S Pressure roller shaft S PF ro...

Page 108: ...ANUAL 4 27 33 Remove the film 34 Remove the document rear sensor and then disconnect the connector 35 Remove the document cover sensor Fig 4 46 Document rear sensor Document cover sensor Document cover LGL Document rear sensor 1 2 Connector Connector Film ...

Page 109: ...C cable 2 Remove the two cup B M3x10 Taptite screws and then remove the driver PCB shield 3 Disconnect the two connectors Fig 4 47 4 Remove the two bind B M4x20 Taptite screws and then remove the scanner unit Fig 4 48 Taptite bind B M4x20 Scanning motor FB harness Document scanner Document scanner Taptite cup B M3x10 Photo interrupter harness FFC cable Driver PCB ASSY Driver PCB shield Main PCB 1 ...

Page 110: ...he two cup B M3x6 Taptite screws and then remove the lock lever ASSY NOTE After moving the lock lever ASSY to A direction assemble B of lock lever B that is to the direction of the top cover rib in touch Fig 4 50 Taptite cup B M4x12 Taptite cup B M4x12 Taptite cup B M4x12 Taptite cup B M4x12 Top cover ASSY Taptite cup B M3x6 Taptite cup B M3x6 Lock lever B Lock lever ASSY Lock lever B Scanner base...

Page 111: ...rom the pulley ASSY 10 Remove the belt support rubber and then remove the belt from the CCD module 11 Disconnect the FFC cable from the CCD module 12 Remove the CCD module from the scanner base Fig 4 51 CCD module Guide shaft Belt 2 1 Pulley ASSY Scanner base Belt CCD module Belt 4 5 7 6 Belt support rubber 3 ...

Page 112: ...cup S M3x6 Taptite screw and then remove the ground wire 16 Remove the four pan B M3x8 Taptite screws and then remove the drive plate ASSY 17 Remove the HP sensor and then disconnect the connector Fig 4 53 FFC plate FFC cable ASSY Taptite cup S M3x6 Scanner base Sponge Hook Taptite cup B M3x8 Pin Ground wire Taptite pan B M3x8 Taptite pan B M3x8 Drive plate ASSY Connector HP sensor Scanner base ...

Page 113: ... washer M3x6 screws and then remove the scanning motor FB Fig 4 54 19 Remove the B M3x6 Taptite screw and then remove the pulley ASSY and pulley spring Fig 4 55 Pulley spring Taptite B M3x6 Pulley ASSY Scanner base Drive plate ASSY Scanning motor FB Pan S P washer M3x6 ...

Page 114: ... Taptite screws and then remove the connector and panel unit Fig 4 56 2 Remove the six cup B M3x8 Taptite screws and then remove the panel rear cover Fig 4 57 Panel unit Taptite cup B M3x8 Taptite cup B M3x8 Panel rear cover Panel cover Taptite cup B M4x12 Taptite cup B M4x12 Panel PCB harness 1 2 Hook Hooks ...

Page 115: ...ASSEMBLY 4 34 3 Disconnect the three cables Fig 4 58 4 Remove the two cup B M3x8 Taptite screws and then remove panel PCB ASSY Fig 4 59 Panel cover Lock Cables 1 2 Lock Cable Taptite cup B M3x8 Panel cover Hooks Panel PCB ASSY 1 2 ...

Page 116: ...P 8020 8025D 8025DN SERVICE MANUAL 4 35 5 Remove the backlight holder and the deffusion film Fig 4 60 6 Remove the LCD Fig 4 61 Backlight holder Deffusion film Panel cover 2 1 3 4 LCD Hooks Hooks Hook LCD Panel cover LCD Hook ...

Page 117: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 36 3 10 Rear Cover C MFC 8420 DCP 8020 only 1 Remove the bind B M4x12 Taptite screw and then remove the rear cover C Fig 4 62 Taptite bind B M4x12 Rear cover C ...

Page 118: ...820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 4 37 3 11 Outer Chute MFC 8420 DCP 8020 only 1 Remove the outer chute Fig 4 63 2 Remove the outer chute tray Fig 4 64 Hook Outer Chute Outer Chute Outer chute tray ...

Page 119: ... ASSEMBLY 4 38 3 12 Rear Cover MP ASSY Outer Chute MP ASSY MFC 8820D 8820DN DCP 8025D 8025DN only 1 Remove the rear cover MP ASSY Fig 4 65 2 Remove the outer chute MP ASSY Fig 4 66 Outer chute MP ASSY Rear cover MP ASSY Hook Hook ...

Page 120: ...ar Cover L R 1 Remove the two bind B M4x12 Taptite screws and then remove the rear cover L 2 Remove the two bind B M4x12 Taptite screws and then remove the rear cover R Fig 4 68 Rear cover MP ASSY Rear cover MP tray Taptite bind B M4x12 Rear cover L Taptite bind B M4x12 Hook Hook Taptite bind B M4x12 Rear cover R ...

Page 121: ...nd B M4x12 Taptite screws and then remove the side cover R Fig 4 69 2 Remove the four bind B M4x12 Taptite screws and then remove the side cover L Fig 4 70 Side cover R Taptite bind B M4x12 Side cover L Taptite bind B M4x12 Taptite bind B M4x12 Taptite bind B M4x12 Taptite bind B M4x12 ...

Page 122: ...tors Fig 4 71 2 Remove the four bind B M4x12 Taptite screws and then remove the joint cover Fig 4 72 Taptite bind B M4x12 Taptite bind B M4x12 Joint cover Hook Hooks Hook Hook Hook Panel PCB harness Driver PCB harness Speaker harness Joint cover Driver PCB ASSY Main PCB Taptite bind B M4x12 Taptite bind B M4x12 ...

Page 123: ...ker hold spring and the speaker Fig 4 73 4 Remove the four bind B M4x12 Taptite screws and then remove the inner chute Fig 4 74 Speaker hold spring Hook Speaker 1 2 Taptite bind B M4x12 Taptite bind B M4x12 Taptite bind B M4x12 Inner chute Hooks Hook Joint cover ...

Page 124: ... L 6 Remove the two bind B M4x12 Taptite screws and then remove the joint cover front R Fig 4 75 7 Remove the cup B M3x10 Taptite screw and then remove the driver PCB ASSY Fig 4 76 Taptite bind B M4x12 Joint cover Taptite bind B M4x12 Joint cover front R Joint cover front L Taptite cup B M3x10 Driver PCB harness Joint cover Driver PCB ASSY Hooks ...

Page 125: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 44 8 Remove the support flap and the support flap S Fig 4 77 Support flap Support flap S ...

Page 126: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 4 45 3 16 Front Cover ASSY MFC 8420 DCP 8020 only 1 Release the link 2 Remove the front cover ASSY Fig 4 78 Frame Front cover ASSY Link ...

Page 127: ...up S M3x6 Taptite screw 4 Remove the MP solenoid holder unit Fig 4 79 5 Remove the cup S M3x6 Taptite screw and then open the MP chute ASSY cover 6 Remove the paper pick up roller ASSY from the shaft Fig 4 80 MP ground spring Paper pick up roller ASSY Taptite cup S M3x6 MP chute ASSY cover MP sensor harness Hook Shaft Engine PCB connector Taptite bind B M3x8 MP solenoid holder unit Taptite cup S M...

Page 128: ...the MP pressure plate remove the separation plate ASSY Fig 4 81 NOTE When replacing with the new separation plate ASSY attach it after peeling the cover paper of double faced tape Fig 4 82 Separation plate ASSY MP chute ASSY MP pressure plate Separation plate ASSY Double faced tape ...

Page 129: ...ease link and then remove the MP front cover ASSY from the MP chute ASSY Fig 4 83 9 Remove the bosses from the guide at 2 spots in the MP tray ASSY and then remove the MP paper guide ASSY Fig 4 84 MP tray ASSY MP front cover ASSY Drive release link MP chute ASSY MP chute ASSY MP paper guide ASSY Shaft Shaft ...

Page 130: ...DN SERVICE MANUAL 4 49 10 Remove the MP tray ASSY Fig 4 85 11 Remove the MP tray support flap 2 and the MP tray support flap 3 from the MP tray ASSY Fig 4 86 MP tray support flap 3 MP tray support flap 2 MP tray ASSY MP tray ASSY MP chute ASSY ...

Page 131: ...12 Open the MP chute ASSY cover 13 Remove the MP PE actuator Fig 4 87 14 Remove the four bind B M4x12 Taptite screws and then remove the MP chute ASSY Fig 4 88 MP PE actuator Taptite bind B M4x12 Taptite bind B M4x12 MP chute ASSY MP chute ASSY ...

Page 132: ...r cover 16 Remove the MP roller cover 17 Remove the MP PE sensor PCB ASSY Fig 4 89 3 18 Rear Cover Sensor 1 Disconnect the connector and then remove the rear cover sensor Fig 4 90 MP PE sensor PCB ASSY Hook pin Hook Hooks Rear cover sensor Connector Hook MP chute ASSY Tite cup S M3x6 MP gear cover Hook pin MP roller cover Hook ...

Page 133: ...move the NCU unit Fig 4 91 3 Remove the cup S M3x6 Taptite screw and then remove the NCU shield cover 4 Remove the two cup S M3x6 Taptite screws and then disconnect the connector 5 Remove the NCU Fig 4 92 Taptite cup S M3x6 Taptite cup S M3x6 Taptite cup S M3x6 Taptite cup S M3x6 NCU harness NCU shield cover NCU shield plate Hook Hook NCU harness NCU NCU unit ...

Page 134: ...ss 2 Remove the bind B M4x12 Taptite screw and the shoulder screw and then remove the fixing unit Fig 4 93 3 Remove the three cup B M3x10 Taptite screws and then remove the FU paper guide Fig 4 94 Pin Pins FU paper guide Taptite cup B M3x10 Fixing unit Fixing unit Thermistor harness Heater harness Taptite bind B M4x12 Shoulder screw ...

Page 135: ...g 4 95 5 Remove the cup B M3x12 Taptite screw 6 Release the thermistor ASSY harness from the hooks 7 Remove the thermistor ASSY Fig 4 96 Thermistor relay PCB ASSY Taptite cup B M3x10 Fixing unit Pins Pin Star wheel holder Taptite cup B M3x12 Fixing unit Thermistor ASSY Hooks Hook Thermistor relay PCB ASSY Thermistor ASSY harness ...

Page 136: ...direction of the thermistor is correct referring to the figure below Fig 4 97 8 Remove the two cup B M3x20 Taptite screws 9 Remove the FU frame upper from the FU frame lower Fig 4 98 Thermistor Thermistor Taptite cup B M3x12 FU frame upper FU frame lower Hook Hook Pin FU frame upper Hook Pin Hook Taptite cup B M3x20 Taptite cup B M3x20 ...

Page 137: ... surface of the halogen heater lamp When securing the screw to assemble the halogen lamp connector plate ensure you use the Fu lamp assembly jig ASSY as shown in the figure below to avoid damaging the edge of the halogen heater lamp Fig 4 100 Screw pan washer M2 6x6 Fu lamp assembly jig ASSY Halogen lamp connector plate Halogen heater lamp Screw pan washer M2 6x6 Heat roller 25 FU frame upper Heat...

Page 138: ...move the HR bearing 25 Fig 4 101 CAUTION Never touch the surface of the heat roller NOTE When re assembling the heat roller 25 to the FU frame upper place the two projections onto the bosses on the frame as shown in the figure below Fig 4 102 HR gear 34 HR retaining ring 25 Heat roller 25 HR bearing 25 Heat roller 25 projection HR gear 34 HR bearing 25 boss Heat roller washer 25 HR bearing 25 ...

Page 139: ... frame upper ensure you do not damage the heat roller 25 with the four separate claw ASSY on the FU frame upper Fig 4 103 18 Remove the pressure roller 25 Fig 4 104 Separate claw ASSY FU frame upper Separate claw ASSY Heat roller 25 Pressure roller 25 FU frame lower FU jam remove cover 2 3 1 ...

Page 140: ...ensure the direction of the roller is correct referring to the figure above Ensure that the both springs are seated correctly in the locating channel and does not protrude from either end Ensure also that the proper spring is fixed to the each cleaner pinch roller ASSY because the both springs are NOT identical with each other Fig 4 106 FU frame lower Cleaner pinch roller ASSY S Cleaner pinch roll...

Page 141: ...ite screw and then remove the eject sensor PCB ASSY 26 Remove the bind B M3x10 Taptite screw and then remove the thermistor relay PCB ASSY Fig 4 107 27 Remove the paper eject actuator and eject actuator spring Fig 4 108 Taptite bind B M3x10 Taptite bind B M3x10 FU frame lower Thermistor relay PCB ASSY Eject sensor PCB ASSY FU frame lower Eject actuator spring Paper eject actuator Hook Hooks Hook E...

Page 142: ... seated correctly in the locating channel referring to the figure below Fig 4 109 28 Disconnect the heater harness 29 Remove the four cup B M3x6 Taptite screws 30 Remove the four claw holder plate 31 Remove the four separate claw ASSY Fig 4 110 Paper eject actuator Eject actuator spring FU frame lower Separate claw ASSY Separate claw ASSY Heater harness Claw holder plate Taptite cup B M3x6 Tweezer...

Page 143: ...2 Disconnect the LD harness 5P from the laser unit 3 Disconnect the polygon motor harness and remove the spongy from the laser unit 4 Remove the six cup S M3x8 Taptite screws and then remove the laser unit Fig 4 112 Filter Air duct Taptite cup S M3x8 Taptite cup S M3x8 LD harness 5P Laser unit Polygon motor harness Spongy Taptite cup S M3x8 Hook Hook ...

Page 144: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 4 63 5 Remove the shutter arm C Fig 4 113 Shutter arm C Frame L ...

Page 145: ...SASSEMBLY AND RE ASSEMBLY 4 64 3 22 Main PCB 1 Disconnect the LD harness 5P 2 Disconnect the four connectors Fig 4 114 Main PCB ASSY LVPS connector Engine connector LVPS connector Thermistor connector LD harness 5P ...

Page 146: ... NOTE After replacing the Main PCB please perform the following operations APPENDIX 1 EEPROM CUSTOMIZING CODES Refer to A 1 APPENDIX 2 1 INSTALING THE UPDATE DATA TO THE MACHINE Refer to A 3 APPENDIX 2 2 SETTING ID CODES TO MACHINES Refer to A 5 Chapter 7 3 12 CCD Scanner Area Setting Maintenance mode 55 Refer to P7 20 Main PCB ASSY Taptite cup S M3x6 Taptite cup S M3x6 Screw pan M3x6 ...

Page 147: ...e pan washer M3 5x6 Taptite screw and then remove the ground wire 4 Remove the base plate Fig 4 116 5 Remove the two bind B M4x12 Taptite screws and then remove the LV insulation sheet Fig 4 117 Taptite cup S M3x6 Taptite bind B M4x12 Taptite bind B M4x12 Taptite bind B M4x12 Taptite cup S M3x6 Base plate Screw pan washer M3 5x6 Ground wire LV insulation sheet Taptite bind B M4x12 ...

Page 148: ...CE MANUAL 4 67 3 24 DX Sensor PCB ASSY MFC 8820D 8820DN DCP 8025D 8025DN only 1 Disconnect the connector 2 Remove the bind B M3x10 Taptite screws and then remove the DX sensor PCB ASSY Fig 4 118 Taptite bind B M3x10 DX sensor PCB ASSY Engine PCB ASSY ...

Page 149: ...r sensor light reception connector Thermistor relay PCB connector Main motor connector Main PCB connector MP tray PCB connector FR solenoid connector PF solenoid connector Fan motor 60 unit connector LT connector Polygon motor connector Fan motor 60 connector LVPS connector Cassette sensor PCB connector Toner sensor light emission connector HVPS connector Document cover sensor connector DX sensor ...

Page 150: ...ANUAL 4 69 3 26 High voltage PS PCB ASSY 1 Remove the bind B M4x12 Taptite screw and then remove the high voltage PS PCB ASSY 2 Disconnect the flat cable from the high voltage PS PCB ASSY Fig 4 121 Taptite bind B M4x12 Flat cable High voltage PS PCB ASSY ...

Page 151: ...3 Remove the two bind B M4x12 Taptite screws and then remove the inlet holder 4 Remove the bind B M4x12 Taptite screw and then remove the SW holder 5 Remove the Fan motor 60 6 Remove the low voltage PS PCB Fig 4 123 Main PCB Engine PCB Connector Heater Connector Taptite bind B M4x12 Low voltage PS PCB Taptite bind B M4x12 Inlet holder Inlet SW holder Taptite bind B M4x12 Low voltage PS PCB Main PC...

Page 152: ...er ASSY 3 Remove the two roller collars from the paper pick up roller ASSY Fig 4 124 4 Remove the bind B M3x10 Taptite screw and then remove the PE sensor cover 5 Remove the cassette sensor PCB ASSY Fig 4 125 Roller collar Roller collar Paper pick up roller ASSY Bearing R Taptite bind B M3x10 PE sensor cover Cassette sensor PCB ASSY 1 2 ...

Page 153: ...the CA actuator Fig 4 126 7 Remove the spring extension P R from the gear 63P R 8 Remove the gear 63P R 9 Remove the ground spring from the conductor bearing Fig 4 127 Gear 63P R Spring extension P R Ground spring PE actuator CA actuator Frame Hooks Conductor Bearing Hooks ...

Page 154: ...move the P R shaft Fig 4 128 12 Remove the idle gear 22 13 Remove the middle roller gear 14 Remove the bind B M3x10 taptite screw and the conductor bearing 15 Remove the 1st F R shaft Fig 4 129 Bearing L P R shaft 1st F R shaft Conductor bearing Taptite bind B M3x10 Idle gear 22 Frame Hook 1 2 Middle roller gear ...

Page 155: ...screws 17 Remove the front chute ASSY Fig 4 130 18 Remove the feed roller gear 19 Remove the bearing F R 20 Remove the feed roller gear shaft Fig 4 131 Front chute ASSY Taptite bind B M4x12 Taptite bind B M4x12 Taptite cup S M3x6 Taptite cup S M3x6 Feed roller gear shaft Feed roller gear Bearing F R Bearing F R Hook Frame ...

Page 156: ...ed roller ASSY in the direction of the arrow 22 Remove the feed roller ASSY 23 Remove the joint 5 and the bearing 5 from the feed roller ASSY Fig 4 132 NOTE Be careful that the different direction installation causes jam when you install joint 5 Fig 4 133 Bearing 5 Joint 5 Feed roller ASSY Hook 1 2 3 4 5 Bearing 5 Joint 5 ...

Page 157: ... 4 134 25 Remove the regist front actuator and regist front actuator spring 26 Remove the regist rear actuator and regist rear actuator spring Fig 4 135 Regist front actuator Regist front actuator spring Regist rear actuator Regist rear actuator spring Chute cover Hook Hook ...

Page 158: ...ICE MANUAL 4 77 NOTE When assembling the regist front actuator and the regist rear actuator set the spring as shown in the figure Fig 4 136 Regist front actuator spring Regist rear actuator Regist rear actuator spring Regist front actuator Hole Hole ...

Page 159: ...Taptite screws 3 Remove the two bind B M3x10 Taptite screws and then remove the frame L Fig 4 137 4 Remove the back up plate ground spring DCP 8020 MFC 8420 only Fig 4 138 Taptite bind B M3x10 Taptite bind B M3x10 Under bar Under bar Main PCB sheet Frame L Frame L Back up plate ground spring Drive unit Taptite bind B M4x12 Taptite bind B M4x12 ...

Page 160: ...the cup S M3x6 Taptite screw and then remove the sub gear plate 10 Remove the LD harness 5P from the drive unit 11 Remove the drive unit 12 Disconnect the connector for the main motor harness from the main motor ASSY Fig 4 139 Taptite bind B M4x12 Taptite bind B M4x12 Taptite cup S M3x6 Taptite cup S M3x10 Main motor harness Taptite cup S M3x6 Sub gear plate Frame L Drive unit Main motor ASSY Grou...

Page 161: ...oid ASSY the P R solenoid lever and the solenoid release spring P R 16 Remove the bind B M3x10 Taptite screw 17 Remove the F R solenoid ASSY and solenoid release spring F R Fig 4 141 Taptite cup S M3x6 Main motor ASSY Drive unit F R solenoid ASSY Solenoid release spring P R P R solenoid ASSY P R solenoid lever Solenoid release spring F R Taptite bind B M3x10 Taptite bind B M3x10 Taptite cup S M3x6...

Page 162: ...nt cover sensor 19 Remove the bind B M3x10 Taptite screw 20 Remove the toner LED PCB unit ASSY 21 Remove the sensor clip 22 Remove the front cover sensor from the frame L Fig 4 142 Taptite bind B M3x10 Toner LED PCB unit ASSY Sensor clip Front cover sensor Sensor clip Frame L Front cover sensor Connector ...

Page 163: ...ring 4 Remove the idle gear and switch arm ASSY 5 Remove the reversing sector gear and release solenoid lever 6 Remove the bind B M3x4 Taptite screw and then remove the reversing release solenoid and solenoid release spring Fig 4 144 Taptite bind B M4x12 PCP case Taptite bind B M4x12 Eject gear frame unit Switch arm return spring Solenoid release spring Frame L Idle gear Hooks Sector gear spring R...

Page 164: ...AL 4 83 3 31 Thermistor ASSY 1 Remove the thermistor ASSY Fig 4 145 3 32 Fan Motor 60 Unit LV Fan Motor 60 Unit 1 Remove the fan motor 60 unit LV and the fan motor 60 unit Fig 4 146 Main frame R Fan motor 60 unit Fan motor 60 unit LV Thermistor ASSY Frame L ...

Page 165: ...ite screws 2 Remove the cup S M3x16 Taptite screw 3 Remove the two cup S M3x6 Taptite screws 4 Remove the main frame R unit Fig 4 147 Taptite bind B M4x12 Taptite cup S M3x6 Under bar Main frame R unit Under bar Taptite cup S M3x6 Taptite bind B M4x12 Taptite bind B M4x12 Taptite cup S M3x16 ...

Page 166: ... 6 Remove the cup S M3x6 Taptite screw 7 Remove the drum spring R 8 Remove the FG plate Fig 4 148 9 Remove the toner sensor PCB unit Light reception Fig 4 149 Toner sensor PCB unit Light reception Pin Drum spring R Taptite bind B M4x12 Taptite bind B M4x12 FG plate Taptite cup S M3x6 Main frame R Main frame R ...

Page 167: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 86 4 PACKING Fig 4 150 Machine Pad Carton Telephone line cord Pad Drum unit Pad AC power cord Carton Carton ADF support Carton ...

Page 168: ...on Genma Japan DHB RMA3 NP303 H only Component side Sn Ag Cu Nihon Genma Japan DHB RMA3 NP303 We use wire solder which is indicated by digit after LF indication on PCB Wire solder made in the contries except Japan are under investigation and will be evaluated 3 Appearance quality criteria The appearance of the surface of portions soldered with lead free solder is basically the same as that for tho...

Page 169: ...nt of the lead free solder is higher The temperature of the soldering iron s tip is restricted to the temperature that the component to be soldered can resist It should be noted that the temperature that the components to be soldered with lead free solder can resist has not increased even though the melting point of the solder has 5 A soldering iron must be correctly applied Even though the meltin...

Page 170: ...ity of the soldering operations The soldering irons used at BIL are model no 941 manufactured by HAKKO and M6 SIC 40 manufactured by BONKOTE The prices of these soldering irons for use with lead free solder are three to four times higher than those for conventional soldering irons with a temperature controller built in 7 No mixing of different solders When repairs are made on a PCB with an LF indi...

Page 171: ...SSY 4 Side cover R 3 Side cover L 4 Rear cover R 2 Rear cover L MFC 2 Driver PCB access cover 1 4 085412 216 Taptite bind B M4x12 Rear cover C 1 0 784 0 098 8 1 3 Document Scanner No Parts code Parts name Location Pcs Tightening torque N m Kgf cm 1 0A4300 605 Rew pan S P washer M3 FB motor 2 0 686 0 098 7 1 2 087320 616 Taptite cup S M3x6 FG harness 1 0 686 0 098 7 1 3 LE2861 001 Taptite pan B M3x...

Page 172: ... 0 686 0 098 7 1 ADF chute ASSY 4 Side cover F 1 5 087311 016 Taptite cup B M3x10 Side cover R 1 0 686 0 098 7 1 6 UF5034 001 Taptite B M3x6 Separation rubber 1 0 392 0 098 4 0 5 7 087311 016 Taptite cup B M3x10 Hinge ASSY L 3 0 686 0 098 7 1 8 087311 016 Taptite cup B M3x10 Rear sensor cover 2 0 686 0 098 7 1 9 087320 616 Taptite cup S M3x6 Ground wire 1 0 686 0 098 7 1 5 Panel No Parts code Part...

Page 173: ... PG4 PG4 PG4 PG4 PG4 PG4 PG4 PG4 PG4 PG4 Shaft idle gear 16 Idle gear 16A Shaft idle gear 16 Idle gear 16A Drive unit Gear 58 88 Pendulum gear 22 Pendulum gear 22 Gear 40 54Y Gear 45 arm F R Gear 17 planetary Gear 20 center F R Flame L PG4 Grease PG662 4 mm dia ball Gear 58 88 ...

Page 174: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 4 93 EM3 EM3 EM3 Grease EM D110 3 mm dia ball DX feed roller Tray feed ZL2 Side regist roller ZL2 Side regist roller ZL2 ...

Page 175: ...CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY 4 94 SK4 PG2 SK4 Grease SK 623 4 mm dia ball Separation plate ASSY PG2 Grease PG 662 2 mm dia ball Paper feed chute Rubber holder ...

Page 176: ... LD harness 5P Toner sensor PCB Toner sensor PCB Engine PCB Main PCB Main PCB Thermistor Laser unit MP solenoid holder unit MP PE sensor PCB Fan motor 60 unit Engine PCB Fan motor 60 unit LV Engine PCB Laser unit Engine PCB 1 3 Laser unit Polygon motor harness 4 Fan motor 60 unit 2 5 Main PCB 6 MP PE sensor PCB 7 ...

Page 177: ...canning motor FB 9 11 Main PCB 12 ADF motor ADF relay PCB ASSY 13 Panel Main PCB ADF ADF motor ADF relay PCB ASSY Driver PCB ASSY Main PCB Engine PCB Low voltage PS PCB ASSY Main PCB Main PCB Main PCB Driver PCB ASSY FFC HP sensor Scanning motor FB Driver PCB ASSY Speaker Engine PCB Rear cover sensor ...

Page 178: ...0 000 pages When printing A4 or Letter size paper at 5 print coverage The actual number of printed pages will vary depending on the average type of print job and paper NOTE There are many factors that determine the actual drum life such as temperature humidity type of paper type of toner used number of pages per print job and so on Under ideal conditions the average drum life is estimated at up to...

Page 179: ...arefully because it may contain toner Replacement Procedure 1 Press the cover release button and then open the front cover of the machine 2 Pull out the drum unit assembly Fig 5 2 CAUTION We recommend that you place the drum unit assembly on a piece of disposable paper or cloth in case you accidentally spill or scatter toner To prevent damage to the machine from static electricity do not touch the...

Page 180: ... cold water immediately Discard the used drum unit according to local regulations keeping it separate from domestic waste If you have questions call your local waste disposal office Be sure to seal up the drum unit tightly so that toner powder does not spill out of the unit Do not reset the drum counter when replacing the toner cartridge only It is recommended to clean the machine when you replace...

Page 181: ...ssage Toner Empty message Toner Empty Open cover then replace new t Fig 5 6 Replacement Procedure 1 Press the cover release button and then open the front cover 2 Pull out the drum unit assembly Drum unit with toner cartridge Fig 5 7 CAUTION It is recommended to place the drum unit assembly on a piece of disposable paper or cloth in case you accidentally spill or scatter toner To prevent damage to...

Page 182: ...r cartridge firmly into the drum unit until you hear it lock into place If you put it in properly the lock lever will lift automatically Make sure you fit the toner cartridge properly or it may separate from the drum unit Fig 5 10 7 Clean the primary corona wire inside the drum unit by gently sliding the blue tab from right to left several times Return the tab to the home position before you put t...

Page 183: ...elf It may also cause serious damage to the performance and life of a genuine Brother drum unit Warranty cover is not applied to problems caused by the use of 3rd party toner or toner cartridges Brother strongly recommends that you do not refill the toner cartridge provided with the machine We also strongly recommend that you continue to use only Genuine Brother Brand replacement toner cartridges ...

Page 184: ...er referring to the service life For the procedures to replace these parts refer to CHAPTER 4 DISASSEMBLY AND RE ASSEMBLY Parts Name Part No Qty Service life number of prints Replacement Procedure Fixing Unit 115V LJ7897001 1 80 000 pages See subsection 3 20 in CHAPTER 4 Paper Feeding Kit Pad holder ZL2 Paper pick up roller ASSY ZL2 LJ7920001 1 50 000 pages See subsection 3 3 and 3 28 in CHAPTER 4...

Page 185: ...ERIODIC MAINTENANCE 5 8 2 1 Fixing Unit Replacement procedure 1 Disconnect the AC cord from the machine Fig 5 12 2 Close the front cover and pull out the paper tray Fig 5 13 Front cover AC cord Paper Tray Machine ...

Page 186: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL 5 9 3 Remove the DX feed ASSY Fig 5 14 4 Remove the rear cover MP ASSY Fig 5 15 Hook DX feed ASSY Rear cover MP ASSY ...

Page 187: ...move the two bind B M4x12 Taptite screws and then remove the rear cover L 7 Remove the two bind B M4x12 Taptite screws and then remove the rear cover R Fig 5 17 Taptite bind B M4x12 Rear cover R Rear cover L Hook Taptite bind B M4x12 Hook Taptite bind B M4x12 Hook Outer chute MP ASSY ...

Page 188: ... and then remove the NCU unit Fig 5 18 9 Disconnect the heater harness and thermistor harness 10 Remove the bind B M4x12 Taptite screw and the shoulder screw and then remove the fixing unit Fig 5 19 Shoulder screw Heater harness Taptite bind B M4x12 Thermistor harness Taptite cup S M3x6 NCU unit Fixing unit ...

Page 189: ...ODIC MAINTENANCE 5 12 2 2 Paper Feeding Kit Replacement procedure 1 Disconnect the AC cord from the machine Fig 5 20 2 Close the front cover and pull out the paper tray Fig 5 21 Machine AC cord Front cover Paper tray ...

Page 190: ...the separation pad spring from the paper tray Fig 5 22 4 Remove the bearing R 5 Remove the paper pick up roller ASSY 6 Remove the two roller collars from the paper pick up roller ASSY Fig 5 23 Pad holder Separation pad spring Paper pick up roller ASSY Bearing R Roller collar Roller collar 1 2 ...

Page 191: ...leaning the Machine Exterior Clean the machine exterior to keep the machine clean 1 Turn off the power switch and unplug the power cord 2 Wipe dirt and dust away from the machine exterior with a damp cloth and allow the machine to dry completely before turning the power on again 3 Plug in the power cord CAUTION Use water or neutral detergents for cleaning Cleaning with volatile liquids such as thi...

Page 192: ...anner window or toner sensor Do not touch the scanner window with you finger The drum unit contains toner so handle it carefully If toner scatters and you hands or cloths get dirty immediately wipe or wash it off with cold water 1 Open the front cover 2 Remove the drum unit and toner cartridge assembly 3 Gently clean the scanner window by wiping it with a clean soft dry cloth Do not use isoproply ...

Page 193: ...o the home position before re install the drum unit assembly Fig 5 27 CAUTION Make sure that the blue tab on the drum unit is returned to the home position mark position before re installing the drum unit into the machine or printed pages may have vertical stripes 5 Re install the drum unit into the machine 6 Close the front cover 3 5 Cleaning the Scanner Window When replacing the drum unit or ton...

Page 194: ...If toner scatters and your hands or cloths get dirty immediately wipe or wash it off with cold water Do not touch the scanner window with your fingers Do not wipe the scanner window with isopropyl alcohol 3 6 Cleaning the Electrical Terminals To obtain the best print performance be sure to clean the electrical terminals inside the machine 1 Turn off the power switch and unplug the power cord 2 Rem...

Page 195: ...me between failure MTBF and the meantime to repair MTTR for this machine are as follows MTBF Up to 4 000 hours MTTR Average 30 minutes except the periodical maintenance parts the Paper Feeding Kit and the machine control boards whose MTTR is average 10 minutes ...

Page 196: ...rect sunlight The room is well ventilated The machine is not placed where the ventilation hole of the machine is blocked 2 Print paper Check if A recommended type of print paper is being used If the paper is too thick or too thin or tends to curl paper jams or paper feed problems may occur or printed images may be blurred The print paper is damp If so use fresh paper and check whether the print qu...

Page 197: ...ndensation has occurred print several pages or leave the machine for 2 hours to allow it to reach room temperature If the drum unit is unpacked soon after it is moved from a cold room to a warm room condensation may occur inside the unit which may cause incorrect images Instruct the user to allow the unit to come to room temperature before unpacking it This will take one or two hours 1 2 Warnings ...

Page 198: ...The machine does not start printing 3 1 Paper Loading Problems 3 2 Original Jams 4 Software Setting Problems Paper jam occurs Transmission and reception of fax can not be done 7 Troubleshooting of Fax Functions Other defect 5 Malfunctions The machine does not print The machine does not work The machine does not load paper The control panel does not work 6 Troubleshooting of the Control Panel 10 Ne...

Page 199: ...d paper Check Paper Size When you see this error the paper in the paper tray does not match the paper size you set in Menu button 1 key and 3 key Either load the appropriate size paper or change the default setting Check Scan Lock The scanner lock is locked Release the scanner lock lever and then press Stop Exit button Comm Error Poor phone line quality caused communication error Try the call agai...

Page 200: ...ntil the other operations in process finish and then try again OR Clear the data in the memory OR Add an optional memory Printing operation in process Reduce print resolution OR Clear the data in the memory OR Add an optional memory No Response Busy The number you dialed does not answer or is busy Verify the number and try again Not Registered You tried to access a One Touch or Speed Dial number t...

Page 201: ... in the machine See Paper Jam on page 6 13 or Paper is jammed in the Duplex Tray For MFC 8820D 8820DN DCP 8025D 8025DN on page 6 16 Toner Empty Toner cartridge is not installed OR Toner is used up and printing is not possible Reinstall the toner cartridge OR Replace the toner cartridge with a new one Toner Low If the LCD shows Toner Low you can still print But the toner is depleted and the machine...

Page 202: ...ded print Recording paper 5C Paper size error of one side only in case of double sided print 5D MP tray sensor remains ON MP tray sensor 5E MP tray sensor remains OFF MP tray sensor 5F DX unit sensor is inactivated DX unit sensor 6A Heater warming up timeout error Heater does not reach 60 C within 11 sec Thermistor ASSY Halogen lamp 6B Heater warming up timeout error Heater does not reach 100 C wi...

Page 203: ...aper width sensor Paper size 81 Paper width sensor remains ON Paper width sensor 82 Paper feeding error Paper pick up roller 83 Recording paper jam At the retry of paper pulling in operation the registration sensor is not OFF Registration sensor Main PCB 84 Recording paper jam The paper width sensor and or registration sensor has detected a paper jam Registration sensor actuator If the paper width...

Page 204: ... scanning CCD unit Main PCB B3 Scan area left edge detection error B4 Scan area right edge detection error CCD unit Main PCB Black markings on the white level reference film inside the scanner top cover B5 Horizontal scanning edge reduction detection error in scanning area setting B6 Horizontal scanning edge enlargement detection error in scanning area setting BB White level data error CCD unit CC...

Page 205: ... Check F5 Internal software error Replace the main PCB if this error occurs frequently F6 PC interface error Interface cable Main PCB FA Reading motor error detected Reading motor FF Memory management error Replace the main PCB if this error occurs frequently ...

Page 206: ...r multi purpose tray Your application software must be set up correctly to print on the envelope size you are using This is usually done in the page setup or document setup menu of your software Please see your software application manual A paper jam has occurred Clear the jammed paper Please see paper jams and how to clear them or the paper jam instructional video on the CD ROM The machine does n...

Page 207: ...Lift the ADF cover 3 Pull the jammed original out to the right 4 Close the ADF cover 5 Press Stop Exit button Fig 6 1 3 2 2 Original is jammed inside the ADF unit 1 Take out any paper from the ADF that is not jammed 2 Lift the document cover 3 Pull the jammed original out to the right 4 Close the document cover 5 Press Stop Exit button Fig 6 2 OR 1 Remove the ADF support out of the ADF unit 2 Pull...

Page 208: ...mpletely out of the machine 2 Pull the jammed paper up and out of the machine Fig 6 4 3 Press the cover release button and then open the front cover 4 Pull out the drum unit assembly Pull the jammed paper up and out of the machine If you cannot remove the drum unit assembly easily at this time do not use extra force Instead pull the edge of the jammed paper from the paper tray Fig 6 5 ...

Page 209: ...can be cleared go to Step 7 Fig 6 7 NOTE If you have to pull the paper toward the back of the machine the fuser may get dirty with toner powder and it may scatter on the next printouts Print a few copies of the test page until the scattering of toner stops CAUTION After you have just used the machine some internal parts of the machine are extremely hot Wait for the machine to cool down before you ...

Page 210: ...it Fig 6 9 7 Close the jam clear cover Close the back output tray 8 Push the lock lever down and take the toner cartridge out of the drum unit assembly Take out the jammed paper if there is any inside the drum unit Fig 6 10 9 Put the drum unit assembly back in the machine 10 Put the paper tray in the machine 11 Close the front cover ...

Page 211: ...ammed in the Duplex Tray For MFC 8820D 8820DN DCP 8025D 8025DN 1 Pull the Duplex Tray and paper tray out of the machine Fig 6 11 2 Pull the jammed paper out of the machine Fig 6 12 3 Pull the Duplex Tray and paper tray back into the machine Fig 6 13 ...

Page 212: ... transfer roller Jam caused by paper length detected as shorter than 80mm The front registration sensor was turned off early Malfunction of actuator or hardware noise Check the front registration sensor referring to 3 9 Sensor OperationaI Check in Chapter 7 Top of paper stopped between the paper feed roller and the pick up roller Jam caused by a paper feed delay Paper was not fed in at the proper ...

Page 213: ...cifications 3 Try printing using the straight through output path 4 Turn over the stack of paper in the cassette or try rotating the paper 180 in the cassette Possible cause Step Check Result Remedy Paper 1 Is the problem solved if new paper is used Yes Instruct the user how to store paper so that it does not absorb moisture Fixing unit entrance guide 2 Is the entrance guide dirty Yes Clean the en...

Page 214: ...dity will cause paper to curl 2 If the machine is used infrequently the paper may have sat for too long in the paper tray Turn over the stack of paper in the paper tray Also try rotating the paper 180 in the paper tray 3 Try printing using the straight through output path NOTE For no paper supplied as the cause of a malfunction see M 4 No paper supplied in 6 MALFUNCTIONS in this Chapter ...

Page 215: ...is selected as Set as Default Check also that the correct print port is set for the selected printer driver 4 Check that the machine is not connected to the same port which is also connected to a mass storage device or scanner Remove all other devices and connect the port to the machine only Turn off the printer status monitor in the device options tab in the printer driver 5 If the print port is ...

Page 216: ... hub Possible cause Step Check Result Remedy Computer Operating System 1 Windows 95 or Windows NT4 0 Yes Not supported Computer settings 2 Does Universal Serial Bus Controllers appear in the Device Manager tab of System Properties in Control Panel No This problem can be caused by your computer settings See the computer manual USB cable machine damage 3 Does Add New Hardware Wizard appears on the s...

Page 217: ...nsions Folder of System Folder No Try to re install the printer driver For System 8 6 or higher BR_PrintMoniter USB Brother Laser Yes Turn off the machine and PC power switch and check all connections between them Then turn them on again S 4 This machine does not appear in Chooser with iMac and Power Macintosh G3 G4 with USB User Check 1 Check the machine is turned on 2 Check the USB interface cab...

Page 218: ... Wiring 4 Unplug the power supply plug Is there a broken wire between the AC input connector of the low voltage power supply and the power plug Yes Replace the AC power cord M 2 No DC power supplied Possible cause Step Check Result Remedy AC power supply 1 Is AC power supplied between connectors CN1 L and CN1 N when the power plug is plugged into the outlet No Follow the same check procedure of M ...

Page 219: ...in PCB M 4 No paper supplied Possible cause Step Check Result Remedy Failure of connector 1 Is the contact of the solenoid connector on the engine PCB good No Reconnect the connector Engine PCB circuit 2 Set paper in the manual paper slot and make a test print by pressing the control panel button Yes Replace the engine PCB Paper pick up clutch solenoid Does the voltage between pins 2 SOLENOID and ...

Page 220: ...Is the contact of connector CN7 on the engine PCB good No Reconnect the connector Blown thermal fuse 2 Remove the fixing unit and measure the resistance of the thermal fuse Is it open circuit Yes Replace the fixing unit Thermistor failure 3 Is the thermistor installed properly Yes Replace the fixing unit No Reinstall the thermistor properly Halogen heater lamp failure 4 Remove the fixing unit and ...

Page 221: ...ce the halogen heater lamp Heater harness connection failure 5 Is the heater harness connector connected to the low voltage power supply PCB and fixing unit secure No Reconnect the connectors securely NOTE This problem will be cleared if leaving the printer power ON for ten minutes If the heater is cooled down sufficiently this problem may be cleared by enter the maintenance mode after press 9 key...

Page 222: ...he connection of the connector between the main PCB and the engine PCB connected correctly No Reconnect the connectors securely Engine PCB 3 Is the problem solved by replacing the engine PCB Yes Replace the engine PCB Main PCB 4 Is the problem solved by replacing the main PCB Yes Replace the main PCB M 14 DIMM failure Possible cause Step Check Result Remedy DIMM failure 1 Try installing DIMM into ...

Page 223: ...wer supply PCB are properly connected No Fix the connection properly Harness between main PCB and low voltage power supply PCB LCD 4 Harness wire is damaged Yes Replace the harness with a normal part LCD 5 Replacement of LCD solves the problem Yes Replace the LCD with a normal part Control panel PCB 6 Replacement of control panel PCB solves the problem Yes Replace the control panel PCB with a norm...

Page 224: ...ay PCB solves the problem Yes Replace the relay PCB with a normal part Control panel PCB 7 Replacement of control panel PCB solves the problem Yes Replace the control panel PCB with a normal part Main PCB 8 Replacement of main PCB solves the problem Yes Replace the main PCB with a normal part L 3 Printing from Macintosh applications fails User Check 1 Verify that the printer driver supplied with t...

Page 225: ...Yes Replace the harness with a normal part Connection between main PCB and control panel PCB 4 Main PCB and control panel PCB are properly connected No Fix the connection properly Harness between main PCB and control panel PCB 5 Harness wire is damaged Yes Replace the harness with a normal part Connection of FPC key 6 FPC key is properly connected No Fix the connection properly FPC key 7 Replaceme...

Page 226: ...ly connected No Fix the connection properly Harness between main PCB and control panel PCB 6 Harness wire is damaged Yes Replace the harness with a normal part Connection of FPC key 7 FPC key is properly connected No Fix the connection properly FPC key 8 Replacement of FPC key solves the problem Yes Replace the FPC key with a normal part NCU PCB 9 Replacement of NCU PCB solves the problem Yes Repl...

Page 227: ...damaged Yes Replace the harness with a normal part Connection between main PCB and NCU PCB 5 Main PCB and NCU PCB are properly connected No Fix the connection properly Harness between main PCB and NCU PCB 6 Harness wire is damaged Yes Replace the harness with a normal part Speaker 7 Replacement of speaker solves the problem Yes Replace the speaker with a normal part Relay PCB 8 Replacement of rela...

Page 228: ...rly Harness between main PCB relay PCB and control panel PCB 6 Harness wire is damaged Yes Replace the harness with a normal part NCU PCB 7 Replacement of NCU PCB solves the problem Yes Replace the NCU PCB with a normal part Relay PCB 8 Replacement of relay PCB solves the problem Yes Replace the relay PCB with a normal part Main PCB 9 Replacement of main PCB solves the problem Yes Replace the main...

Page 229: ... t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o u t t e s t p r i n t o u t t e s t P r i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o u t t e s t p r i n t o u t t e s t P r i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o u t t e s t p r i n t o u t t e s t P r i n t o u t t e s t p r i n t o P r i n t o...

Page 230: ...rinted after the toner cartridge is replaced with a full one Yes The wiper of the toner cartridge is defective Replace the toner cartridge Drum connection failure 3 Are all the contacts between the drum unit and machine connected correctly No Clean contact electrodes both on the drum unit and in the machine 1 4 5 6 High voltage power supply PCB failure 4 Is the harness connection between the high ...

Page 231: ...ne High voltage power supply PCB failure 4 Is the connections of the connector between the high voltage power supply PCB and the engine PCB secured correctly Yes Replace the high voltage power supply PCB Main PCB failure 5 Are there any disconnected connectors No Replace the main PCB Engine PCB failure 6 Are there any disconnected connectors No Replace the engine PCB User Check 1 Check the paper u...

Page 232: ...es Replace the drum unit Toner cartridge failure 4 Is the problem solved after replacing the toner cartridge Yes Replace the toner cartridge with a new one Scanner harness connection failure 5 Is the scanner harness connected securely Check if there is any play in the connection No Reconnect the connector correctly Main PCB failure 6 Are printing signals being input to the laser unit Is the proble...

Page 233: ...n 4 Is the laser unit connected to the main PCB correctly No Connect the harness between the laser unit and the main PCB correctly High voltage power supply PCB failure 5 Is the problem solved after replacing the high voltage power supply PCB Yes Replace the high voltage power supply PCB Main PCB failure 6 Is the problem solved after replacing the main PCB Yes Replace the main PCB CCD unit 7 Is th...

Page 234: ...oller dirty Is the problem solved after replacing the drum unit Yes Replace the drum unit No Replace the high voltage power supply PCB NOTE This problem may disappear after printing approximately 10 pages of completely blank sheets How to clean the pressure roller Clean the pressure roller as follows 1 Set ten or more sheets of paper in the paper tray 2 Check the absence of paper in the ADF and th...

Page 235: ...drum surface scratched Yes Replace the drum unit Cleaning failure 6 Is the drum surface dirty with toner in streaks Yes Replace the drum unit Scratch on the heat roller 7 Is the surface of the heat roller scratched Yes Replace the fixing unit NOTE If you print the same pattern continuously the drum will be worn and black vertical streaks will appear on the paper This problem may occur with noise d...

Page 236: ... contact failure 4 Are the charge electrodes between the machine and the drum unit dirty Yes Clean both electrodes 3 High voltage power supply PCB failure 5 Is the problem solved after replacing the high voltage power supply PCB Yes Replace the high voltage power supply PCB I 8 Black vertical streaks in a gray background Possible cause Step Check Result Remedy Ground contacts Translucent stain on ...

Page 237: ...artridge dirty Yes Clean the electrodes at both sides 4 User Check 1 Try to wipe the scanner window with a soft cloth 2 The toner cartridge may be damaged Install a new toner cartridge 3 Check the machine s environment High temperature and high humidity conditions can cause this problem 4 Damp wet paper might be used Try to change to freshly unpacked paper User Check 1 Check the paper used meets t...

Page 238: ...of the rear registration sensor normal No Reposition the sensor to the correct position I 12 Poor fixing Possible cause Step Check Result Remedy Print paper 1 Is thick paper of more than 43lb being used Yes Recommend to use the specified types of paper Toner sensing failure When printing is faint 2 Is the problem solved by replacing the drum unit or the toner cartridge Yes 1 Toner is empty 2 The t...

Page 239: ... i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o u t t e s t p r i n t o u t t e s t P r i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o u t t e s t p r i n t o u t t e s t P r i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o P r i n t o u t t e s t p r i n t o u t t e...

Page 240: ...n the toner cartridge almost empty Yes Replace the toner cartridge with a new one Print paper 4 Is the problem solved after changing to specified freshly unpacked paper Yes Damp wet paper might be used Recommend to change freshly unpacked paper Environment 5 Does the problem still appear after the machine has warmed up Yes 1 Replace the drum unit 2 Advise the user of the specified print environmen...

Page 241: ... at the surface of the photosensitive drum Fig 6 16 3 Wipe the surface of the photosensitive drum with a cotton swab until the dust or paper powder on the surface comes off Fig 6 17 CAUTION Do not wipe the surface of the photosensitive drum with something sharp ball point pen etc Use cleaning liquid which is a 50 50 mixture of ethyl alcohol and pure water Position of smudge on the drum 94mm interv...

Page 242: ...nected correctly No Clean contact electrode both on the drum unit and in the machine 8 Fixing unit 3 Are the spots at 79mm intervals The problem is not solved after printing a few pages Yes 1 Check and clean the heat roller with a cloth dampened with alcohol 2 Replace the fixing unit High voltage power supply PCB failure 4 Is the problem solved after replacing the high voltage power supply PCB Yes...

Page 243: ...esult Remedy Ground contacts Corona failure 1 Is the wire cleaner at its home position No Return the wire cleaner to its home position 2 Corona failure 2 Is the corona wire dirty Yes 1 Clean the corona wire 2 If the problem still appears after cleaning replace the drum unit 2 ...

Page 244: ...drum unit and toner cartridge Be sure to close the cover after removing the drum unit and toner cartridge Yes Toner sensor failure Clean the toner sensor and check the toner sensor connection Toner cartridge failure 3 Is the problem solved after replacing the toner cartridge Yes Replace the toner cartridge Drum unit failure 4 Is the problem solved after replacing the drum unit Yes Replace the drum...

Page 245: ...artridge failure 1 Is the problem solved after replacing the toner cartridge Yes Replace the toner cartridge High voltage power supply PCB failure 2 Is the problem solved after replacing the high voltage power supply PCB Yes Replace the high voltage power supply PCB User Check 1 Check the paper used meets the recommended paper specifications 2 Select the Thick paper mode in the printer driver or u...

Page 246: ... ground contacts on the back side of the paper tray connecting correctly No Clean the contacts 7 I 22 Light rain Possible cause Step Check Result Remedy Ground contact Drum unit failure 1 Is the problem solved after replacing the drum unit Yes Replace the drum unit Drum connection failure 2 Is the contact between the drum unit and machine connected correctly No Clean contact electrode both on the ...

Page 247: ...es Replace the high voltage power supply PCB I 24 Toner specks User Check 1 Check the paper used meets the recommended paper specifications Damp paper thick media or rough surfaced paper can cause the problem 2 Check the machine s environment High temperature and high humidity conditions can cause the problem 3 Check that the appropriate media type is selected in the printer driver 4 Try installin...

Page 248: ...Contacts 8 4 1 Drum unit Fig 6 18 8 4 2 Machine body Paper tray Fig 6 19 Drum Unit Paper Tray 2 Wire cleaner 3 Charge 1 Photosensitive drum 7 Ground 5 Grid 5 Grid 3 Charge 1 Photosensitive drum 6 Transfer roller 6 Transfer roller 4 Development roller 4 Development roller 8 Cleaner 8 Cleaner ...

Page 249: ...nd try again 4 Check that the appropriate printer driver is selected as Set as Default Check also that the correct print port is set for the selected printer driver 5 Check that the machine is not connected to the same port which is also connected to a mass storage device or scanner Remove all other devices and connect the port to the machine only Turn off the printer status monitor in the device ...

Page 250: ...es Replace the main PCB Is it possible to print the data No Replace the DIMM P 3 Headers or footers are not printed out even though they are viewed on PC screen User Check Most laser machines have a restricted area that cannot be printed on Usually the first two lines and last two lines of text cannot print leaving 62 printable lines Adjust the top and bottom margins in your document to allow for ...

Page 251: ...hat in some instances it can take up to two minutes for the print fax server to load its IP address after setting the IP address If a successful response is received then proceed to the UNIX TCP IP Windows NT LAN Server Windows 98 95 Me Peer to Peer LPR Internet Printing or Web Browser troubleshooting section Otherwise proceed to step 3 and then go to subsection 10 3 TCP IP Troubleshooting b If yo...

Page 252: ... on the other hub or multi port repeater 5 If you have a bridge or router located between the print fax server and host computer make sure that the device is set up to allow the print fax server to send and receive data from the host For example a bridge can be set up to only allow certain types of Ethernet addresses to pass through a process known as filtering therefore such a bridge must be conf...

Page 253: ...ry in the etc bootptab file is correctly configured 5 Also verify that host computer and the print fax server are either on the same subnet otherwise that the router is properly configured to pass data between the two devices 10 4 UNIX Troubleshooting 1 Make sure that the etc printcap file if applicable is typed in correctly In particular look for missing and characters because a small error anywh...

Page 254: ... of the print fax server in the Name or address of server providing lpd box 10 6 Windows 95 98 Me Peer to Peer Print LPR Troubleshooting If you are having trouble printing on a Windows 95 98 Me Peer to Peer network LPR method check the following 1 Make sure that the Brother LPR Port driver is correctly installed and configured according to the Windows 95 98 Me Peer to Peer chapters 2 Try to turn t...

Page 255: ... are having problems printing large files the problem may be in the e mail system Some e mail systems have difficulties printing large files If the file does not reach its destination intact then the problem is with the E mail system 3 You can also enable the partial e mail print facility on your client PC this will split the e mail up into fragments which should then not overwhelm your e mail ser...

Page 256: ...ftware or by using a web browser or the BRAdmin Professional utility and in the file server using the PCONSOLE Print Fax Server Information Change Password command 2 If you created the print queue using PCONSOLE and instead of BRAdmin Professional utility make sure that you have enabled at least one NetWare file server using the SET NETWARE SERVER servername ENABLED command 3 Have you exceeded you...

Page 257: ...Talk zone Because the print fax server gets its zone information from router broadcasts it may not be in the zone you expect and will therefore not show up in the Chooser If this is the case you may need to force the zone name using BRAdmin Professional utility a web browser 10 13 DLC LLC Troubleshooting If you are having trouble printing with DLC LLC check the following 1 Make sure that the DLC L...

Page 258: ...d into smaller documents that will be accepted by the mail server Ex A 42 page document of the CCITT 1 test chart is approximately 1Mbyte in size 6 If you do not receive e mail check the Auto Polling setting and Polling frequency 7 If you cannot retrieve mail from the mail server check the setting for the POP3 server and Mailbox name Check that the POP3 password is entered correctly This setting i...

Page 259: ...try from the keys To select one of the maintenance mode functions listed in Section 2 enter the corresponding 2 digit function code with the numerical keys on the control panel The details of each maintenance mode function are described in Section 3 NOTE Pressing the 9 key twice in the initial stage of the maintenance mode makes the machine exit from the maintenance mode restoring it to the standb...

Page 260: ...3 7 7 12 13 Operational Check of Control Panel PCB 3 8 7 13 14 15 32 Sensor Operational Check 3 9 7 14 53 Received Data Transfer Function 3 10 7 16 54 Fine Adjustment of Scan Start End Positions 3 11 7 18 55 CCD Scanner Area Setting 3 12 7 20 74 EEPROM Customizing 3 13 7 21 77 Printing out of Machine Log Information 3 14 7 22 80 Display of the Equipment s Log Information 3 15 7 24 82 Machine Error...

Page 261: ...r accessible selectors which are shaded in the firmware switch tables in Appendix 3 The service personnel should instruct end users to follow the procedure given below 1 Press the Menu and Enlarge Reduce button in this order NOTE The Enlarge Reduce button does not work when the machine is in the retry mode or the timer function is set 2 Press the 0 key 3 Enter the desired function code 06 10 11 12...

Page 262: ...r Telephone function registration One touch dialing Speed dialing Group dialing All of these will be initialized These will not be initialized NOTE If you replace the main PCB with one used for any other machine carry out this procedure and then customize the EEPROM maintenance mode function code 74 in Subsection 3 13 Operating Procedure 1 Press the 0 and 1 keys or the 9 and 1 keys according to yo...

Page 263: ...s in this order in the initial stage of the maintenance mode The WHITE LEVEL 1 will appear on the LCD 2 The equipment prints out the scanning compensation data list containing the following a Dark output adjustment value CH0 1Byte b Dark output adjustment value CH1 1Byte c Bright output adjustment value CH0 1Byte d Bright output adjustment value CH1 1Byte e Black level data CH0 1Byte f Black level...

Page 264: ...CHAPTER 7 MAINTENANCE MODE 7 6 Fig 7 3 l m a b c d e f g h i j k ...

Page 265: ...MAINTENANCE 06 is displayed until the CCD unit is placed in position When the CCD unit is placed in the position the PLEASE SCAN LOCK appears on the LCD 2 Open the document cover and lock the scanner lock lever at the rear left of the scanner unit When the scanner lock lever is locked the SCAN LOCKED appears To terminate this operation press the Stop button The machine returns to the initial stage...

Page 266: ...tion much like the copying function prints out test pattern 1 to allow the service personnel to check for record data missing or print quality Operating Procedure Press the 0 and 9 keys in this order in the initial stage of the maintenance mode The figure below shows test pattern 1 Fig 7 4 ...

Page 267: ...gnal setting WSW03 PABX mode setting WSW04 TRANSFER facility setting WSW05 1st dial tone and busy tone detection WSW06 Pause button setting and 2nd dial tone detection WSW07 Dial tone setting 1 WSW08 Dial tone setting 2 WSW09 Protocol definition 1 WSW10 Protocol definition 2 WSW11 Busy tone setting WSW12 Signal detection condition setting WSW13 Modem setting WSW14 AUTO ANS facility setting WSW15 R...

Page 268: ...0 0 0 0 3 Use the and keys to move the cursor to the selector position to be modified 4 Enter a value to be set 0 or 1 using the 0 and 1 keys 5 Press the Set button This operation saves the newly entered selector values onto the EEPROM and readies the machine for accepting a firmware switch number 6 Repeat steps 2 through 5 until the modification for the desired firmware switches is completed 7 Pr...

Page 269: ...ting items and contents specified by the firmware switches Operating Procedure 1 Press the 1 key twice in the initial stage of the maintenance mode The PRINTING will appear on the LCD 2 The machine prints out the configuration list as shown in the figure below 3 Upon completion of printing the machine returns to the initial stage of the maintenance mode Fig 7 5 ...

Page 270: ...itial stage of the maintenance mode The LCD shows 2 Press the Start button Each time you press the Start button the LCD cycles through the displays shown at right The Status lamp also changes from orange red to green each time you press the Start button 3 Press the Stop button in any process of the above display cycle The machine beeps for one second and returns to the initial stage of the mainten...

Page 271: ...e illustration below If a key or button is pressed out of order the machine beeps and displays the INVALID OPERATE on the LCD To return to the status ready to accept key button entry for operational check press the Stop button 3 After the last number key or button is pressed the machine beeps for one second and returns to the initial stage of the maintenance mode To terminate this operation press ...

Page 272: ...2 FAFUPOLVDX which can be switched by pressing the Start button for machines Given below is the relationship between the LCD indication sensor names and sensor status LCD Sensors Sensing status DF Document front sensor No document detected DR Document rear sensor No document detected FC Document tray open sensor Document cover close FH CCD HP sensor CCD unit placed in home position CV Cover sensor...

Page 273: ...ration sensor s open the front cover or the document cover remove the toner cartridge jam paper at the paper outlet insert paper from the manual feeder and load a recording paper tray etc 3 Press the Stop button The machine beeps for one second and return to the initial stage of the maintenance mode NOTE If you have opened and closed the front cover during the above procedure you need to open and ...

Page 274: ...the number of received documents The 1 NO OF JOBS will appear Press the Set button and then the number of received documents is displayed e g NO OF JOBS 10 3 Press the 2 key to transmit an activity report The 2 ACTIVITY will appear Press the 3 key to transfer received data It is transferred with an activity report attached The 3 DOCUMENTS will appear If no received data exists NO DOCUMENT will app...

Page 275: ...del code Boot ROM information ROM information Serial number Fig 7 10 Example of the end page FAX TRANSFER END PAGE JOB NO TOTAL PAGE S NAME FAX TEL 001 001 BROTHER 052 824 2330 052 824 2846 MACHINE STATUS 1 A1 MACHINE STATUS 2 A3 MACHINE STATUS 3 AA MACHINE STATUS 4 A1 MACHINE STATUS 5 84 MACHINE STATUS 6 A1 MACHINE STATUS 7 00 MACHINE STATUS 8 00 MACHINE STATUS 9 00 Job No of the transfer setting...

Page 276: ...key 3 Press the 1 or 2 key to display the present compensation level for the start position Compensation levels can be adjusted in 11 steps from 5 to 5 mm 4 Press the left arrow key to increase compensation levels and the right arrow key to lower them Press the Stop button and the machine returns to the initial state of the maintenance mode without adjusting compensation levels 5 Press the Set but...

Page 277: ...L 7 19 MAINTENANCE ACCEPTED 1 ADF 2 FB SCAN START ADJ MAINTENANCE MAINTENANCE Fig 7 13 Fig 7 14 Stop button 5 and 4 keys Right arrow key Stop button Left arrow key Set button 1 second later Set button Right arrow key Left arrow key 2 second later 1 or 2 keys ...

Page 278: ...a specified in the table input its corresponding 5 digit data value input data e g 4723 47247 3 Save the magnification compensation setting value in the EEPROM and then return to the initial stage of the maintenance mode Input Data for Magnification Compensation after Performing ZL2FB Maintenance 55 Maintenance 55 Required Input Data Input data 1 4610 4619 46156 2 4620 4629 46257 3 4630 4639 46358...

Page 279: ...f the maintenance mode The current customizing code e g 0302 in the case of MFC8820D CANADA version appears 2 Enter the desired customizing code e g 9301 in the case of MFC8820D U S A version The newly entered code appears NOTE The machine does not work properly when an incorrect code is entered 3 Press the Start button The machine saves the setting and appears the PARAMETER INIT on the LCD The ma...

Page 280: ...o print out log information Operating Procedure 1 Press the 7 key twice in the initial stage of the maintenance mode The MAINTENANCE 77 will appear on the LCD 2 The machine prints out a list of log information The example of the log information is shown below Fig 7 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 ...

Page 281: ...up according to the paper size 12 Total number of paper jams 13 Number of jams that occurred at each tray 14 Number of jams that occurred inside at the rear 15 Number of times the drum has been changed and the last date when the drum was replaced 16 Number of pages printed by a drum 17 Number of times the toner cartridge has been changed and the last date when the toner cartridge was replaced 18 N...

Page 282: ...g how many times toner replacement has been made 7 Copy page count indicating how many copies have been made 8 PC print page count indicating how many pages the equipment has been printed as an output device of the connected PC 9 FAX page count indicating how many received FAX pages have been printed 10 Error code of the most recent machine error 1 11 Error code of the most recent communications e...

Page 283: ... MP tray DX_PAGE Number of pages picked up from the DX tray A4 LTR Number of A4 Letter size sheets picked up LG A4L Number of Legal A4 Long size sheets picked up B5 EXE Number of B5 Executive size sheets picked up ENVLOP Number of envelopes picked up OTHER Number of other size sheets picked up DRUM Drum counter COVERAGE Average black coverage DRUM_CH Number of times the drum has been replaced DATE...

Page 284: ...line It allows the service personnel to receive the transmission log of the user s machine at a remote location and use it for analyzing problems arising in the user s machine Operating Procedure 1 If the user s machine has a transmission related problem call the user s machine at a remote location from your machine 2 If the line is connected have the user perform the following 1 Hook up to the ex...

Page 285: ...n setting the memory security mode so as not to exit from the memory security mode NOTE Carrying out this procedure will lose passwords previously entered but retain FAX messages received in the memory security mode Operating Procedure 1 When the SECURE MODE is displayed on the LCD hold down the Menu button and press the key Within two seconds start to press the 2 7 9 0 and 0 keys The memory secur...

Page 286: ...which the machine is ready to accept entry from the keys 2 Press the 7 and 4 keys in this order in the initial stage of the maintenance mode The current customizing code e g 0302 in the case of MFC8820D CANADA version appears 3 Enter the desired customizing code e g 9301 in the case of MFC8820D U S A version The newly entered code appears NOTE The machine does not work properly when an incorrect c...

Page 287: ... 0304 FRANCE 0005 0105 0105 0205 0305 0305 BELGIUM 0008 0108 0208 0308 0308 NETHERLANDS 0009 0109 0209 0309 SWITZERLAND 0010 0110 0210 0310 IRELAND 0204 0304 DENMARK 0013 0113 0113 0213 0313 0313 AUSTRIA 0203 0303 0303 SPAIN 0015 0115 0115 0215 0315 0315 ITALY 0016 0116 0216 0316 PORTUGAL 0018 0118 0118 0218 0318 0318 SOUTH AFRICA 0004 0104 0204 0304 ASIA 0004 0104 0340 PAN NORDIC 0057 0157 0257 0...

Page 288: ...is turned off 2 Make sure that the power cord of the machine is unplugged from a wall socket or other power source 3 Connect the parallel interface cable to the parallel port on the back of the machine and secure it with the lock wires 4 Connect the other end of the interface cable to the printer port of your PC and secure it with the two screws 1 2 Setting up the Machine and Your PC 1 Plug the po...

Page 289: ...downloading the machine beeps intermittently Upon completion of the downloading the machine beeps continuously NOTE If the machine cannot return to the standby state after completion of downloading turn the power off and on On a PC running Windows 98 Me 2000 1 Install the printer driver for the parallel port to your PC Once installed no more printer driver is required for your PC 2 Copy the update...

Page 290: ...eck the printer driver of MFC 8820 MFC 8420 DCP 8025 or DCP 8020 is installed in a host computer before working When not installed Please install a printer driver in a host computer before working 2 1 Connecting the Machine to Your PC See the illustration on page A 3 1 Make sure that your PC is turned off 2 Make sure that the power cord of the machine is unplugged from a wall socket or other power...

Page 291: ...e as an ID code Then press the OK button The setup utility will transmit the ID code data from your PC to the machine and then it will terminate The machine will automatically return to the standby mode 3 To check whether the entered character string ID code is correct make the machine then press the 8 key and 0 key in this order refer to CHAPTER 7 Subsection 3 15 The USB serial number appears on ...

Page 292: ... speed setting A 26 WSW20 Overseas communications mode setting A 27 WSW21 TAD setting 1 A 28 WSW22 ECM setting A 28 WSW23 Communications setting A 29 WSW24 TAD setting 2 A 30 WSW25 TAD setting 3 A 30 WSW26 Function setting 4 A 31 WSW27 Function setting 5 A 32 WSW28 Function setting 6 A 33 WSW29 Function setting 7 A 34 WSW30 Function setting 8 A 34 WSW31 Function setting 9 A 35 WSW32 Function setti...

Page 293: ...fault dialing mode pulse DP or tone PB dialing 0 PB 1 DP l Selectors 1 and 2 Dial pulse generation mode These selectors set the number of pulses to be generated in pulse dialing N Dialing N generates N pulses Dialing 0 generates 10 pulses N 1 Dialing N generates N 1 pulses 10 N Dialing N generates 10 N pulses l Selectors 3 and 4 Break time length in pulse dialing These selectors set the break time...

Page 294: ...cations 1 2 Tone signal transmission time length No 1 2 0 0 70 ms 0 1 80 ms 1 0 90 ms 1 1 100 ms 3 4 Min pause in tone dialing No 3 4 0 0 70 ms 0 1 80 ms 1 0 90 ms 1 1 140 ms 5 8 Attenuator for pseudo ring backtone to the line selectable in the range of 0 15 dB 0 0 dB 1 8 dB 0 0 dB 1 4 dB 0 0 dB 1 2 dB 0 0 dB 1 1 dB l Selectors 1 through 4 Tone signal transmission time length and Min pause in tone...

Page 295: ... sharing a modular wall socket with the machine Upon detection of CNG signals by the number of cycles specified by these selectors the machine interprets CNG as an effective signal and then starts FAX reception Selector No 1 No 5 Cycle 0 A 0 A 0 A 1 B 1 B 0 A 1 B 1 B 0 5 cycle 1 0 cycle 1 5 cycles 2 0 cycles WSW04 TRANSFER facility setting Selector No Function Setting and Specifications 1 6 Not us...

Page 296: ... deactivate the 1st dial tone detection function which detects the 1st dial tone issued from the PSTN when a line is connected to the PSTN Setting all of these selectors to 1 activates the dial tone detection function so that the machine starts dialing upon detection of a dial tone when a line is connected For the detecting conditions of the 1st dial tone refer to WSW07 and WSW08 Other setting com...

Page 297: ...tion in automatic receiving mode This selector determines whether or not the machine automatically disconnects a line upon detection of a busy tone in automatic receiving mode WSW06 Pause button setting and 2nd dial tone detection Selector No Function Setting and Specifications 1 3 Pause button setting and 2nd dial tone detection No 1 2 3 0 0 0 No pause 0 0 1 3 5 sec WAIT 0 1 0 7 sec WAIT 0 1 1 10...

Page 298: ...communications line After that the machine will insert a WAIT of 3 5 seconds If no 2nd dial tone is received within the specified time length set by WSW08 the machine will disconnect the line if in automatic dialing or it will start transmitting the dial signal if given after depression of the Pause button in hook up dialing l Selectors 4 through 6 Detection of 2nd dial tone Upon detection of the ...

Page 299: ...through 7 are not applicable in those countries where no dial tone or line current detection is supported e g U S A l Selectors 1 and 2 Frequency band range These selectors set the frequency band for the 1st dial tone and the busy tone before dialing to be detected This setting is effective only when selectors 1 through 3 of WSW05 are set to 1 1 1 l Selectors 4 through 6 2nd dial tone detection le...

Page 300: ...Bm 0 1 1 30 dBm 1 0 0 33 dBm 1 0 1 36 dBm 1 1 0 39 dBm 1 1 1 42 dBm NOTE The WSW08 is not applicable in those countries where no dial tone detection is supported e g U S A l Selectors 1 through 3 1st dial tone detection time length Upon detection of the 1st dial tone for the time length set by these selectors the machine starts dialing This setting is effective only when selectors 1 through 3 of W...

Page 301: ...a message into 64 octet frames Remarks The error correction mode ECM is a facsimile transmission manner in which the machine divides a message into frames for transmission so that if any data error occurs on the transmission line the machine retransmits only those frames containing the error data l Selector 2 Use of non standard commands If this selector is set to 0 the machine may use non standar...

Page 302: ...ion of the last dial digit to CML ON This selector sets the time length from when the machine transmits the last dial digit until the CML relay comes on l Selector 3 Time length from CML ON to CNG transmission This selector sets the time length until the machine transmits a CNG after it turns on the CML relay l Selector 4 Time length from CML ON to CED transmission This selector sets the time leng...

Page 303: ...W11 is not applicable in those countries where no busy tone detection is supported The setting of WSW11 is effective only when selectors 5 and 6 of WSW05 are set to 0 1 or 1 1 Busy tone detection l Selectors 1 and 2 Frequency band range These selectors set the frequency band for busy tone to be detected l Selectors 3 through 8 ON OFF time length ranges These selectors set the ON and OFF time lengt...

Page 304: ... Not used l Selectors 1 through 4 Min and max OFF time length of calling signal Ci If the machine detects the OFF state of calling signal Ci for a time length which is greater than the value set by selectors 1 and 2 and less than the value set by selectors 3 and 4 it interprets the Ci signal as OFF l Selectors 5 and 6 Detecting time setting These selectors set the time length required to make the ...

Page 305: ...stics of analogue signals on a line Attenuation in the high band frequency is greater than in the low band frequency Set these selectors according to the distance from the telephone switchboard to the machine l Selectors 3 and 4 Reception level These selectors set the optimum receive signal level l Selectors 5 through 8 Modem attenuator These selectors are used to adjust the transmitting level of ...

Page 306: ...0 0 0 2 to 3 times 1 0 0 1 2 to 4 times 1 0 1 0 2 to 5 times 1 0 1 1 2 to 6 times 1 1 0 0 1 to 10 times 1 1 0 1 2 to 10 times 1 1 1 0 3 to 5 times 1 1 1 1 4 to 10 times l Selectors 1 through 4 Frequency band selection These selectors are used to select the frequency band of calling signals for activating the AUTO ANS facility In the French versions if the user sets the PBX to OFF from the control ...

Page 307: ...edials by the number of times set by selectors 3 through 6 at intervals set by selectors 1 and 2 This setting is effective only when selector 7 is set to 0 l Selectors 7 Redialing for no response sent from the called terminal This selector determines whether or not the machine redials if no G3 command response comes from the called station after dialing within the time length set by selectors 7 an...

Page 308: ...1 Functional l Selector 2 CCITT superfine recommendation If this selector is set to 1 the machine communicates in CCITT recommended superfine mode 15 4 lines mm If it is set to 0 it communicates in native superfine mode l Selector 7 Max document length limitation This selector is used to select the maximum length of a document to be sent l Selector 8 Stop key pressed during reception If this selec...

Page 309: ...e the alarm function which sounds an alarm when the handset is off the hook after the communication is completed The off hook alarm works also for an external telephone connected to the EXT modular socket l Selector 5 Calendar clock type If this selector is set to 0 USA the MM DD YY hh mm format applies if it is set to 1 Europe the DD MM YY hh mm format applies DD is the day MM is the month YY is ...

Page 310: ...g 1 0 Up to phase B at the calling station only 1 1 All transmission phases both at the calling and called stations l Selectors 2 and 3 Detection enabled time for CNG and no tone After the line is connected via the machine or the external telephone the machine can detect a CNG signal or no tone for the time length specified by these selectors The setting specified by these selectors becomes effect...

Page 311: ...3 the machine attempts to establish the transmission link via the modem If the establishment fails the machine automatically steps down to the next highest speed and attempts to establish the transmission link again The machine repeats this sequence while stepping down the transmission speed to the last choice specified by selectors 4 through 6 If the modem always falls back to a low transmission ...

Page 312: ...ons mode These selectors should be used if the machine malfunctions in overseas communications According to the communications error state select the signal specifications Setting selector 2 to 1 allows the machine to use 1100 Hz CED signal instead of 2100 Hz in receiving operation This prevents malfunctions resulting from echoes since the 1100 Hz signal does not disable the echo suppressor ES whi...

Page 313: ...ECM in sending 0 ON 1 OFF 2 ECM in receiving 0 ON 1 OFF 3 Call Waiting Caller ID 0 ON 1 OFF 4 Not used 5 8 Not used ECM Error correction mode NOTE Selector 3 is applicable to the American version only but not applicable to those models equipped with high speed modem Selectors 5 through 8 are applicable to the Asian version only l Selector 3 Call Waiting Caller ID Setting this selector to 0 allows ...

Page 314: ... head of a series of zeros is detected If it is set to 1 the called station starts counting zeros upon detection of 10 ms successive zeros 50 ms after the head of a series of zeros is detected In this case if the detection of 10 ms successive zeros is too late the data counting period will become less than 1 0 second making the called station judge the line condition unacceptable l Selectors 2 and...

Page 315: ...n These selectors set the length of time from CML ON up to the start of pseudo ring backtone transmission WSW25 TAD setting 3 Selector No Function Setting and Specifications 1 4 Not used 5 7 Pause between paging number and PIN No 5 6 7 0 0 0 2 sec 0 0 1 4 sec 0 1 0 6 sec 0 1 1 8 sec 1 0 0 10 sec 1 0 1 12 sec 1 1 0 14 sec 1 1 1 16 sec 8 Not used l Selectors 5 through 7 Pause between paging number a...

Page 316: ...ry message transmission If this selector is set to 0 the machine waits for document reading into the memory to complete and then starts dialing This enables the machine to list the total number of pages in the header of the facsimile message l Selectors 4 and 5 No of CNG cycles to be detected when the line is connected via the external telephone except in the external TAD mode The machine interpre...

Page 317: ...only in models versions having a TEL key Selector 4 is applicable only to the U S A versions l Selector 2 Ringer OFF setting This selector determines whether or not the ringer can be set to OFF l Selector 4 Detection of distinctive ringing pattern If this selector is set to 1 the machine detects only the number of rings if it is set to 0 the machine detects the number of rings and the ringing time...

Page 318: ...dB 0 1 0 2 dB 0 1 1 3 dB 1 0 0 0 dB 1 0 1 1 dB 1 1 0 2 dB 1 1 1 3 dB 4 6 Transmission level of DTMF low band frequency signal No 4 5 6 0 0 0 0 dB 0 0 1 1 dB 0 1 0 2 dB 0 1 1 3 dB 1 0 0 0 dB 1 0 1 1 dB 1 1 0 2 dB 1 1 1 3 dB 7 8 Not used l Selectors 1 through 6 Transmission level of DTMF high low band frequency signal These selectors are intended for the manufacturer who tests the machine for the St...

Page 319: ...able to the European version only l Selector 4 Duty cycle control of pulsed current for the heat fixing unit Setting this selector to 1 activates the duty cycle control that suppresses the rush current The duty cycle is 10 ms ON and 20 ms OFF However the duty cycle control may emit switching noise to the AC line Depending upon the codes and regulations in the country this selector should be set to...

Page 320: ...e current recording paper If it is set to 0 the machine records one page data at full size 100 without reduction if it is set to 1 the machine records it at the size specified according to the current paper size l Selector 5 Minimum short OFF duration in distinctive ringing The ringer pattern consists of short and long rings e g short short long rings This selector sets the minimum OFF duration fo...

Page 321: ...efault resolution These selectors set the default resolution which applies when the machine is powered up or completes a transaction l Selectors 7 and 8 Default contrast These selectors set the default contrast which applies when the machine is powered up or completes a transaction WSW33 Function setting 11 Selector No Function Setting and Specifications 1 5 Not used 6 Report output of polled tran...

Page 322: ... 1 OFF 8 Not used NOTE Selectors 4 and 5 are not applicable to the American version l Selectors 6 and 7 Number of DTMF tone signals for inhibiting the detection of CNG during external TAD operation If the machine receives this specified number of DTMF tone signals during external TAD operation it will not detect CNG afterwards If these selectors are set to 1 1 the CNG detection will not be inhibit...

Page 323: ... data from the PC l Selector 3 PC power off recognition time This selector sets the time length from when the machine detects the PC powered off until it recognizes the detected state as power off If selector 2 is set to 0 it is recommended that selector 3 be set to 1 otherwise the machine may mistakenly detect PC powered off l Selector 5 Escape from phase C This selector determines whether or not...

Page 324: ...lector determines whether or not the 1st page image data of a document will be printed out onto the error report if the document image data stored in the temporary memory cannot be transmitted normally l Selector 2 Erasure of the stored image data of an unsent document at the time of the subsequent in memory message transmission If in memory message transmission fails repeatedly when selector 1 is...

Page 325: ...er These selectors set the equalizer s training level to be applied if the machine fails to send training due to weak line connection If these selectors are set to 0 X the modem will automatically set the appropriate training level l Selector 3 Sending level of guard tone at phase 2 This selector sets the sending level of guard tone for 1800 Hz to be sent at Phase 2 in the V 34 mode l Selector 4 S...

Page 326: ...irst and last choices of transmission speed for fallback These selectors are used to set the modem speed range With the first transmission speed choice specified by selectors 1 through 4 the machine attempts to establish the transmission link via the modem If the establishment fails the machine automatically steps down to the next highest speed and attempts to establish the transmission link again...

Page 327: ...mission speed choice is 33600 bps specified by selectors 1 through 4 of WSW39 for example the allowable maximum transmission speed will be limited to 31200 bps If selector 8 is set to 1 to mask the 2400 symbols second when the first transmission speed choice is 33600 bps then the allowable maximum transmission speed remains 33600 bps If selector 8 is set to 1 to mask the 2400 symbols second when t...

Page 328: ...fect only in the V 34 mode Selectors 1 through 3 are applicable only to models equipped with a flat bed scanner l Selectors 1 through 3 ON duration of the fluorescent lamp built in the CCD unit If the scanning operation is started when the fluorescent lamp is off then the lamp will come on for scanning These selectors determine how long the lamp will stay ON after scanning If these selectors are s...

Page 329: ...ction 0 OFF 1 ON 4 JBIG 3 coding system 0 Disabled 1 Enabled 1 POP Post Office Protocol 2 SMTP Simple Mail Transfer Protocol 3 JBIG Joint Bi level Image Group NOTE Selectors 1 through 3 are applicable to those models equipped with LAN interface l Selector 3 Internet FAX forward function If this selector is set to ON the machine may forward a FAX message received through Internet to other remote G3...

Page 330: ...command transmission No 2 3 0 0 50 ms 0 1 100 ms 1 0 150 ms 1 1 0 ms 4 5 Detection time of 2100 Hz CED or ANSam No 4 5 0 0 200 ms 0 1 300 ms 1 0 400 ms 1 1 500 ms 6 Not used 7 Automatic start of remote maintenance 0 No 1 Yes 8 JPEG coding 0 Disabled 1 Enabled NOTE Selector 1 is applicable to those models equipped with LAN interface l Selector 8 JPEG coding Setting this selector to 0 disables the e...

Page 331: ... only to models equipped with a flat bed scanner l Selectors 6 through 8 Effective time length of the white level compensation data obtained beforehand If you set documents in the ADF and the document front sensor detects them or if you open the document tray ASSY and the document tray open sensor detects the open state then the controller will make correction of the reference voltage to be applie...

Page 332: ...ning standby position after you set them in the ADF as well as determining whether or not the ADF automatically draws in documents l Selectors 4 through 6 Periodical correction intervals of the reference voltage applied to white level compensation for document scanning during standby These selectors set the correction intervals in seconds of the reference voltage to be applied to white level compe...

Page 333: ...8 are applicable only to models equipped with a flat bed scanner l Selectors 1 and 2 Monitoring the PC ON OFF state For the related functions refer to WSW36 selectors 2 and 3 l Selectors 3 Parallel port output pins kept at high level Setting this selector to 0 will keep all parallel output pins of the facsimile equipment at high level Use this setting if Resource Manager bundled with MFC models in...

Page 334: ... 125 pcs 1 0 1 150 pcs 1 1 0 175 pcs 1 1 1 200 pcs 6 8 Not used WSW49 Function setting 24 Selector No Function Setting and Specifications 1 2 Size of the RAM Disk when using PCL PS 0 0 None 0 1 1 Mbytes 1 0 2 Mbytes 1 1 4 Mbytes 3 Presence or absence of copy completion sound 0 Present 1 Absent 4 5 Flag detection time when receiving a command 0 0 150 ms 0 1 350 ms 1 0 550 ms 1 1 750 ms 6 7 Scanning...

Page 335: ...APPENDIX 4 CIRCUIT DIAGRAMS A 50 Appendix 4 1 Main PCB Circuit Diagram 1 6 ...

Page 336: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 51 Appendix 4 2 Main PCB Circuit Diagram 2 6 ...

Page 337: ...APPENDIX 4 CIRCUIT DIAGRAMS A 52 Appendix 4 3 Main PCB Circuit Diagram 3 6 ...

Page 338: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 53 Appendix 4 4 Main PCB Circuit Diagram 4 6 ...

Page 339: ...APPENDIX 4 CIRCUIT DIAGRAMS A 54 Appendix 4 5 Main PCB Circuit Diagram 5 6 ...

Page 340: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 55 Appendix 4 6 Main PCB Circuit Diagram 6 6 ...

Page 341: ...APPENDIX 4 CIRCUIT DIAGRAMS A 56 Appendix 4 7 Driver PCB Circuit Diagram ...

Page 342: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 57 Appendix 4 8 Engine PCB Circuit Diagram 1 2 ...

Page 343: ...APPENDIX 4 CIRCUIT DIAGRAMS A 58 Appendix 4 9 Engine PCB Circuit Diagram 2 2 ...

Page 344: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 59 Appendix 4 10 NCU PCB Circuit Diagram U S A ...

Page 345: ...APPENDIX 4 CIRCUIT DIAGRAMS A 60 Appendix 4 11 NCU PCB Circuit Diagram Europe ...

Page 346: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 61 Appendix 4 12 NCU PCB Circuit Diagram Asia ...

Page 347: ...APPENDIX 4 CIRCUIT DIAGRAMS A 62 Appendix 4 13 NCU PCB Circuit Diagram Oceania ...

Page 348: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 63 Appendix 4 14 Control Panel PCB Circuit Diagram ...

Page 349: ...APPENDIX 4 CIRCUIT DIAGRAMS A 64 Appendix 4 15 Low voltage Power Supply PCB Circuit Diagram 200V ...

Page 350: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 65 Appendix 4 16 Low voltage Power Supply PCB Circuit Diagram 100V ...

Page 351: ...APPENDIX 4 CIRCUIT DIAGRAMS A 66 Appendix 4 17 High voltage Power Supply PCB Circuit Diagram 200V ...

Page 352: ...MFC 8420 8820D 8820DN DCP 8020 8025D 8025DN SERVICE MANUAL A 67 Appendix 4 18 High voltage Power Supply PCB Circuit Diagram 100V ...

Page 353: ...April 03 SM FAX018 8C5703 Printed in Japan ...

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