Brother 1660e - B/W Laser Printer Service Manual Download Page 112

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Appendix 6. Main PCB Circuitry Diagram (4/7)

CODE

UK3787000

B48K294/295CIR (4/7)

NAME

A-6

Summary of Contents for 1660e - B/W Laser Printer

Page 1: ...MECHANICS ELECTRONICS SERVICE MANUAL LASER PRINTER ...

Page 2: ...Brother Industries Ltd Centronics is a registered trademark of Genicom Corporation PostScrip is a registered trademark of Adobe Systems Incorporated IBM Proprinter XL is a registered trademark of International Business Machines Corporation EPSON FX 850 is a registered trademark of Seiko Epson Corporation HP GL and HP Laser Jet 5 are registered trademarks of Hewlett Packard Company ...

Page 3: ...isassembling and reassembling procedure of mechanical system ChapterV MaintenanceandServicing Parts replacement schedule list of tools lubricants and cleaners ChapterVI Troubleshooting Reference values and adjustment troubleshooting for image defects troubleshooting for malfunctions etc Appendices Engine Block Diagram PCB Circuitry Diagrams etc Information in this manual is subject to change due t...

Page 4: ... Unsealed EP ED Cartridges I 10 CHAPTER II THEORY OF OPERATION 1 BASIC OPERATIONS II 1 1 1 Mechanical Configuration II 1 1 2 Main Drive II 2 1 3 Basic Sequence of Operations II 3 2 LASER SCANNER SYSTEM II 4 3 IMAGE FORMATION SYSTEM II 5 3 1 Outline II 5 3 2 Printing Process II 5 3 2 1 Electrostatic latent image formation stage II 6 3 2 2 Developing stage II 8 3 2 3 Transfer stage II 9 3 2 4 Fixing...

Page 5: ...r assy rear cover assy IV 4 1 5 2 Changeover guide jam remove cover IV 5 1 6 Side Cover R IV 5 1 7 DC Fan Motor IV 6 1 8 Main PCB IV 6 1 9 Control Panel Unit IV 8 1 10 Scanner Unit IV 9 1 11 Cartridge StopperAssy IV 9 1 12 Paper Feed Chassis Unit IV 10 1 13 Separation PadAssy IV 11 1 14 MP PE Sub Actuator IV 12 1 15 P Feed Size SW PCB Assy IV 12 1 16 Side Switch Spring IV 12 1 17 Regist Sensor Act...

Page 6: ...IMAGE DEFECTS VI 3 3 1 Image Defect Examples VI 3 3 2 Troubleshooting Image Defects VI 4 4 TROUBLESHOOTING OF MALFUNCTIONS VI 11 5 TROUBLESHOOTING PAPERTRANSPORT PROBLEMS VI 19 5 1 Paper Jams VI 19 5 2 Incomplete Paper Feed VI 22 6 OPERATION VI 23 6 1 Line Inspection Mode Procedure VI 23 6 2 DRAMTest VI 25 7 STATUS MESSAGE LIST VI 26 APPENDICES 1 Engine Block Diagram A 1 2 Paper Feed Size SW PCB C...

Page 7: ...printer The printer is approved by the US Center for Devices and Radiological Health CDRH E Paper can be fed in two ways by the multi purpose paper feed tray and paper cassette F Maintenance is easy with print component units which are directly detachable and they require no adjustment after reassembly 2 SPECIFICATIONS 1 Type Desktop page printer 2 Printing method Electrophotography single compone...

Page 8: ...O B5 A5 ISO B6 A6 Executive A4 or letter size paper with the print density set at level 8 with 4 coverage recommended 60 g m 105 g m and Envelope com10 monarch C5 DL ISO B5 Multi purpose Tray Plain paper of 90 x 148 mm 216 x 356 mm recommended 60g m 135 g m overhead projector OHP film postcards label stock and envelopes specified sizes 10 Cassette Tray 1 Universal cassette A4 Letter Legal ISO B5 E...

Page 9: ...1 0 4 23 1 0 4 23 1 0 4 23 1 0 4 23 1 0 SIZE A mm B mm C mm D mm A 4 Letter Legal Executive B 6 ISO A 6 B 5 ISO A 5 210 0 297 0 203 2 288 5 215 9 279 4 207 4 270 9 215 9 355 6 207 4 347 1 176 0 250 0 167 5 241 5 184 2 266 7 175 7 258 2 148 0 210 0 139 5 201 5 125 0 176 0 116 5 167 5 105 0 148 0 96 5 139 5 E mm 3 39 1 0 4 23 1 0 4 23 1 0 4 23 1 0 4 23 1 0 4 23 1 0 4 23 1 0 4 23 1 0 The sizes above ...

Page 10: ...xtrabold Antique Oakland Oblique Bold Brougham Oblique Bold BoldOblique ClevelandCondensed Connecticut Guatemala Antique Italic Bold Bold Italic Letter Gothic Oblique Bold Maryland Oklahoma Oblique Bold BoldOblique PC Brussels Light Light Italic Demi Demi Italic PC Tennessee Roman Italic Bold Bold Italic Utah Oblique Bold Bold Oblique Utah Condensed Oblique Bold BoldOblique Bitmapped Fonts Portrai...

Page 11: ...onallowed Storageconditions Printer Temperature Normal total storage time x 9 10 0 35 C Severe total storage time x 1 10 High Low 35 C 60 C 20 C 0 C Temperaturechange within3minutes High Low 60 C 15 C 20 C 25 C Albertville Extrabold Antique Oakland Oblique Bold Cleveland Condensed Conecticut Guatemala Antique Italic Bold Bold Italic Letter Gothic Oblique Bold Maryland Oklahoma Oblique Bold Bold Ob...

Page 12: ...tified as a Class 1 laser product under the US Department of Health and Human Services DHHS Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968 This means that the printer does not produce hazardous laser radiation Since radiation emitted inside the printer is completely confined within the protective housings and external covers the laser beam canno...

Page 13: ...hose specified in this manual may result in hazardous radiation exposure Figure 1 2 MANUFACTURED BROTHER INDUSTRIES LTD 15 1 Naeshiro cho Mizuho ku Nagoya 467 Japan This product complies with FDA radiation performance standards 21 CFR chapter 1 subchapter J 3 3 Additional Information When servicing or adjusting the optical system of the printer be careful not to place screwdrivers or other reflect...

Page 14: ... RS 232C interface connector 15 Centronics interface connector 16 Optional interface connector 4 PARTS OF THE PRINTER 4 1 External Views 1 Upper cover 2 Control panel 3 MP tray 4 Tray 1 5 Tray 2 Option 6 Font card slot 7 Font cartridge slot 8 Power switch 2 4 10 11 6 3 8 5 7 1 9 15 13 16 12 14 Figure 1 4 ...

Page 15: ...r unit 5 Transfer unit 6 Face down tray 7 Print delivery path 8 Fixing unit 9 Low voltage power supply assy 10 High voltage power supply assy 11 Paper cassette Tray 1 12 Pick up rollers 13 MP tray 14 Control panel 9 13 8 1 2 3 4 5 12 11 7 6 10 4 2 Cross Sectional View 14 Figure 1 5 ...

Page 16: ... contains a photosensitive drum that has an organic photoconductor OPC which deteriorates when exposed to strong light It also contains toner The user therefore should be fully informed about the correct storage and handling of EP ED cartridges 1 Storage requirements 1 Avoid places exposed to direct sunlight or near a window Do not leave an EP ED cartridge in a car in warm or hot weather even if i...

Page 17: ...roups of signals 1 BASIC OPERATIONS 1 1 Mechanical Configuration The printer functions can be divided into four blocks the laser scanner system the image formation system the paper pick up feed system and the control system Figure 2 1 Expansion memory SIMM Font cartridge card Optional I O MIO External Device Control panel IMAGE FORMATION SYSTEM Cleaning unit Photosensitive drum Developing unit Las...

Page 18: ...SDRIVE output from the main PCB Figure 2 2 Main motor Main motor drive signal MDRIVE Main PCB Drum gear Photosensitive drum Fixing unit Paper delivery rollers Paper feed motor Paper feed motor drive signal MP tray pick up roller solenoid drive signal MPSOL MP tray pick up roller solenoid MP tray pick up roller Tray1 pick up roller solenoid drive signal PUCL1 Tray1 pick up roller solenoid Tray1 pic...

Page 19: ...ts on A4 paper Power on Print WAIT STBY PRINT Ready lamp Fixing heater Main motor 170 C control 190 C STBY control 170 C control Scanner motor Paper feed motor Pick up roller solenoid Laser diode Registration sensor 0 15 sec 0 15 sec 1 88 sec 1 73 sec 3 18 sec Figure 2 3 ...

Page 20: ...eed The laser beam reflected by the scanning mirror focuses on the photosensitive drum via the focusing lenses arranged in front of the scanning mirror The path of the beam coming through the focusing lenses is reflected by the reflective mirror As the scanning mirror rotates at a constant speed the laser beam scans the photosensitive drum at a constant speed As the photosensitive drum rotates at ...

Page 21: ...jor part of the image formation system is contained in the cartridge as shown in Figure 2 5 The cartridge used by the printer has a seamless photosensitive drum with the structure shown in Figure 2 6 The outer layer of the drum consists of an organic photoconductor OPC the base is aluminum The printing process can be divided into five major stages Figure 2 5 Base Photoconductive layer Laser beam D...

Page 22: ... 3 Develop ment Figure 2 7 3 2 1 Electrostatic latent image formation stage This stage has two steps which together produce a pattern of electrical charges on the photosensitive drum At the end of the stage negative charges remain in the unexposed dark area Charges are absent from the light areas where the laser beam struck exposed the drum surface Since this image of negative charges on the drum ...

Page 23: ...to keep the potential on the drum surface uniform This DC bias is changed with the developing DC bias This charging method has advantages such as lower applied voltage less ozone generation etc compared with the corona charge system Step 2 Scanning exposure Figure 2 10 _ _ _ Laser beam Unexposed area Exposed area When the laser beam scans the drum surface it causes the charge to be neutralized in ...

Page 24: ...ive charge by friction due to the rotation of the cylinder The areas on the drum that were exposed to the laser beam have a higher potential are less negative than the negatively charged toner particles on the developing cylinder When these areas approach the cylinder the potential difference projects the toner particles onto them This is called toner projection and the latent image on the drum be...

Page 25: ...gative insequence Duringwait initialrotation andlastrotation theprintersetstheprimaryDCvoltage to zero and sets the charge on the drum to zero In this case the transfer voltage is made negative to remove the negatively charged toner on the transfer charging roller to the drum The transfer charging roller is thus cleaned 3 2 3 Transfer stage In the transfer stage the toner image is transferred from...

Page 26: ...er becoming higher than that of the lower roller resulting in the toner being drawn to the lower roller and adhering to the lower roller surface 3 2 5 Drum cleaning stage In the transfer stage not all the toner is transferred to the paper Some remains on the photosensitive drum This residual toner is cleaned off in the drum cleaning stage so that the next print image will be clear Step 7 Drum clea...

Page 27: ...er by the transfer roller unit Then the residual toner is removed from the drum surface with the cleaner blade The cartridge also has a toner sensor When the output from this sensor falls below a certain level it warns that the EP ED cartridge will be out of toner with an alarm Primary charge AC drive HV1AC Primary charge DC drive HV1DC Developing bias AC drive DBAC Developing bias DC drive DBDC T...

Page 28: ...detected by the paper ejection sensor if printed paper has not reached or not cleared the paper ejection sensor in a specified time the printer judges that a paper jam has occurred In this case a paper jam is noticed to the external devise by a status signal Figure 2 18 Main PCB Paper ejection sensor Fixing rollers Transfer roller Main motor Photosensitive drum Registration sensor Tray1 Pick up ro...

Page 29: ...e specified temperature while a cassette with paper is in the printer the READY lamp changes from flashing to lighting When the engine controller circuit receives PRNT or PRFD signal from the video controller circuit the paper feed motor starts rotation About 0 2 seconds later the printer actuates the tray1 pick up roller solenoid and the pick up roller makes one rotation This feeds paper to the p...

Page 30: ...te feed Tray1 paper empty sensor MP tray feed MP tray paper empty sensor 2 The pick up roller solenoids are different Cassette feed Tray1 pick up roller solenoid MP tray feed MP tray pick up roller solenoid 0 15 sec 0 15 sec Main motor Paper feed motor Registration sensor Paper empty sensor Pick up roller solenoid Paper ejection sensor STBY PRINT STBY PRNT or PRFD 0 84 sec Figure 2 20 ...

Page 31: ...1 Paper exists at the paper ejection sensor or the registration sensor when power is switched on JAM REAR or JAM INSIDE 2 Paper has not reached the registration sensor within a specified time JAM TRAYS 3 Printed paper has not passed through the registration sensor within a specified time JAM INSIDE 1 4 Printed paper has not reached the paper ejection sensor within a specified time JAM INSIDE 2 5 P...

Page 32: ...al 1 88 sec 1 88 sec Main motor Paper ejection sensor Paper feed motor Jam check Jam inside 2 Figure 2 23 Jam rear STBY PRINT Jam Normal 7 17 sec 7 17 sec Main motor Paper ejection sensor Paper feed motor Jam check Figure 2 24 ...

Page 33: ...e Engine controller circuit 2 Displays the current printer status in LED and LCD and enables settings from the control panel The operation sequence of the printer controlled by a microprocessor in the Engine Controller Circuit The Engine Controller Circuit outputs signals to drive the various loads on the laser diode scanner motor main motor etc according to the print commands and image data from ...

Page 34: ...lash card requires 12V power supply when writing or erasing data The address bus is buffered by LS245 and the data bus is buffered by LCX245 4 Centronics RS 232Cinterfaceblock Centronicsparallelinterface Data transmission and reception are controlled by the MB87F1610 19 RS 232C Data transmission and reception are controlled by the MB87F1610 19 The ADM202JRN 35 serves as driver receiver 5 SIMM bloc...

Page 35: ...ionalsocketsareavailablefortwo8MbitEPROM µPD27C8000DZ 120 NECorequivalent forexpansion ROM access time should be less than 120nsec 7 DRAM block DRAMs are used for receiving buffer or working area of the CPU The DRAM block contains four 16Mbit DRAMs thus having 8MB memory capacity in total The refreshing method is CBR Cas Before Ras DRAM access time should be less than 80nsec ...

Page 36: ...ected it will become one memory space and ROM 0 supports upto 16MB CSROM 3 is a rest of the memory space with 256MB 5E00_0000 5E20_0000 5E40_0000 5E60_0000 5E80_0000 5EA0_0000 5EC0_0000 5EE0_0000 5F00_0000 5F20_0000 5F40_0000 5F60_0000 5F80_0000 5FA0_0000 5FC0_0000 5FFF_FFFF USB HRC GS setting Memory wait setting BD LSB setting Write to LSB DRAM transfer SDRAM mode setting Soft support function FC...

Page 37: ...MB 4MB 4MB 4MB 4MB 4MB 8MB 8MB 8MB 8MB 8MB 8MB 8MB 8MB 8MB 8MB 8MB 8MB 8MB 1MB 2MB 4MB 1MB 1MB 2MB 2MB 4MB 4MB 4MB 1MB 2MB 1MB 2MB 4MB 1MB 2MB 4MB 8MB 0830 0000 0840 0000 0850 0000 0860 0000 0870 0000 0880 0000 0890 0000 08A0 0000 08B0 0000 08C0 0000 08D0 0000 08E0 0000 08F0 0000 0900 0000 0910 0000 0920 0000 0930 0000 0940 0000 0950 0000 0960 0000 0970 0000 0980 0000 0990 0000 09A0 0000 ...

Page 38: ...3FP CPU VIDEO CPU ENGINE ASIC µPD65626 ASIC M65340 FP Control panel connector Font card connector Font cartridge connector Centronics parallel I F connector ROM block RS 232C serial I F connector DRAM block SIMM block Option I F connector ...

Page 39: ...t Control G 1 Scanner Motor Control Circuit G 2 Laser Diode Drive PCB Control Circuit H Fan Motor Drive Circuit I Main Motor Control Circuit J Cover Open Detect Circuit K Safety Door Switch Circuit Components in the Circuit refer to the next page Engine Controller Circuit Primary charging roller MP Tray Pick up Solenoid Scanner Unit High Voltage Power Supply Assy Paper Feeder PCB Detectors Main Mo...

Page 40: ...noid Drive Circuit and Connector D Multi Purpose Tray Pick up Solenoid Drive Circuit and Connector E Sensors E 1 Tray1 Paper Empty Sensor E 2 Multi Purpose Tray Paper Empty Sensor E 3 Regist Sensor E 4 Pre Regist Sensor E 5 Paper Detect Sensor in Duplex Unit F Tray1 Paper Size Detect Switches Refer to the next page ...

Page 41: ...24VB 24VRET 5V 0V R16 4 7K 24VRET 0V R15 4 7K 0V Q3 2SC5060 24V 24V CA SOL P3 CA SOL 1 2 24VRET Q2 2SC5060 24V 24V MP SOL P4 MP SOL 1 2 02D HLD Q1 DTC114ES 0V R12 82 R11 27 R10 1K 5V 24VRET 24VRET 24VRET R5 1 1W R6 1 1W R4 2 2K R7 2 2K C4 222 C5 222 C6 471 C3 471 R8 47K R3 47K 5V 0V C2 103 C1 100µ 35V 24VB 24VB 24VB 24VB 4 3 MT D 6 MT C 1 MT B 2 MT A 5 P1 FEED MOTOR 1 SLA7027M B48K140 1 P1 SIZE PS...

Page 42: ...tive LED lamps Illuminating when Low and extinguished when High PAD4 PAD7 LCD control signal LCDRS A signal to distinguish PAD4 PAD7 into command and data LCDE A signal to start the operation SW1 SW8 Input signals from the switches Going Low when each switch is pressed 3 DISPLAY CIRCUIT 3 1 Outline The control panel of this printer has four LED lamps one LCD display and eight switches The control ...

Page 43: ...ngine controller 24V output is reserved in the DC block for the cooling fan for the low voltage power supply assy 4 2 Protection Functions Each of the power supply circuits 5V and 24V has a protection function to prevent the circuit from accident by automatically cutting off the power supply in the case of a over voltage or over current of the load When the cooling fan stops to rotating an over vo...

Page 44: ... N L N Power Switch SW1 Noise Filter Rectfier Inlet Transformer Rectfier Chopper Over Voltage Detector Feedback Control 1 4 2 3 6 7 5 8 HEAT 24V 5V 5V 0V 0V 24VRET FANLOCK P3 To Heater Circuit F101 F102 P1 Figure 3 9 Low Voltage Power Supply PCB Block Diagram ...

Page 45: ...er cylinder The developer bias DC changes according to values of the input signal DNSTY which is for print density adjustment like the primary high voltage DC 3 Transfer charging Transfer bias is controlled by the input signals HVT1 4 and HVTFB When the input signal HVT1 gets the Low level negative high voltage is applied to the transfer roller When the input signal HVT2 gets the Low level positiv...

Page 46: ...l Unit DNSTY Control Circuit ON OFF Circuit Feedback Circuit Pulse Generator Control Unit Feedback Circuit ON OFF Circuit Control Unit DNSTY Control Circuit ON OFF Circuit Feedback Circuit PULSE DEVELOPER BIAS DC DEVELOPER BIAS AC PULSE PRIMARY HIGH VOLTAGE DC PRIMARY HIGH VOLTAGE AC 1 5 2 3 4 HV1AC DNSTY HV1DC DBAC DBDC P4 High Voltage Electrode P2 DBOUT Figure 3 10 High Voltage Power Supply Bloc...

Page 47: ...tor Current Buffer P5 High Voltage Electrode Current Buffer Attenuator Constant Current Control Unit Feedback Circuit ON OFF Circuit Toner Sense Control Unit HVT4 Control Circuit Current Buffer Toner 1 Circuit Toner 2 Circuit P3 Toner Sense Electrode Pulse Generator Constant Voltage Control Unit Figure 3 11 High Voltage Power Supply Block Diagram 2 ...

Page 48: ...ling observe the following precau tions during maintenance work 1 Always turn off the power before replacing parts or units When having access to the power supply be sure to unplug the power cord form the power outlet 2 Be careful not to lose screws washers or other parts removed for parts replacement 3 Be sure to apply grease to the teeth of gears 4 When using soldering irons and other heat gener...

Page 49: ...DER MAIN PCB CONTROL PANEL UNIT BEAM SCANNER UNIT DUCT CARTRIDGE GUIDE L CARTRIDGE STOPPER ASSY SCANNER HOLDER ASSY FEED FLAT CABLE 20P PAPER FEED CHASSIS UNIT PAPER DELIVERY HOLDER SPRING FIXING UNIT TRANSFER UNIT CARTRIDGE GUIDE R GROUND LEAF SPRING PANEL ARM L R HEAT INSULATION COVER LV HARNESS 8P DC GEAR HOLDER ASSY PS SWITCH WIRE REMOTE SWITCH HIGH VOLTAGE POWER SUPPLY PCB ASSY LOW VOLTAGE PO...

Page 50: ... 2 1 3 Side Cover L 1 Release the lock by pinching the lever on the left top surface A and remove the cover by pulling it rearward B Figure 4 3 Toner cartridge lid Upper cover assy Control panel unit Side cover L Paper tray Rear cover assy Cleaner brush Hook lever Side cover L A Open the toner cartridge lid Supporter Upper cover assy Toner cartridge lid Side cover R B Font cover assy ...

Page 51: ...p and releasing the hooks on the bottom and the side Figure 4 6 Figure 4 4 A Screw Hook Font cover assy Hook Upper cover assy Screws Screws Rear cover assy Figure 4 5 2 Loosen the top left screw 3 Remove the upper cover assy A Refer to Figure 4 5 4 Remove the rear cover by pulling it rearward B Refer to Figure 4 5 Screw hook Upper cover assy Note The hook is released automatically by removing the ...

Page 52: ... the front C 3 Remove the changeover guide from the boss by bending the right hook viewed from the rear of the rear cover D then remove the changeover guide E 1 6 Side Cover R 1 Remove the side cover R by releasing the 4 hooks Figure 4 7 Hole Rear cover assy Changeover guide Jam remove cover Dents Boss D E B C A Figure 4 8 Front Side cover R Hook at 4 places Note Before releasing the 4 hooks remov...

Page 53: ...older 3 Remove the fan harness connector from the main PCB assy Figure 4 10 Figure 4 11 1 8 Main PCB Note If replacing the main PCB with a new one follow the step in the attached insertion sheet with the new main PCB to install it 1 Remove the SIMM replace lid Figure 4 9 2 screws DC fan holder Screw Fan connector DC fan motor Screws yellow SIMM replace lid MIO box Screws 2 Remove the MIO box ...

Page 54: ... 5 Remove the fan harness 3P the fuser harness 4P the SCN harness 4P the SCN flat cable 6P the DC motor harness 4P the HV harness 16P and the LV harness 8P Figure 4 14 Figure 4 13 PCB holder Screws SCN harness 4P HV harness 16P LV harness 8P Switch flat cable 21P Feed flat cable 20P SCN flat cable 6P Fuser harness 4P 7 screws Main PCB assy 6 Remove the main PCB assy Fan harness 3P DC motor harness...

Page 55: ... arm L Control panel unit Control panel unit Panel sheet 8 Hooks C Main PCB 1 Remove the left side the control panel from the arm L by loosening the screws of the panel arm L 2 Remove the switch flat cable 21P from the main PCB 3 Remove the control panel from the right panel arm R pin by sliding the control panel to the right Figure 4 15 D A B A Tilt the control panel unit B Pinch the lever C Whil...

Page 56: ...per Assy 1 Loosen 4 screws and remove the scanner mount plate in the direction of the arrow the ground leaf spring is also released at the same time 2 Release the hook by bending the arm of the cartridge stopper assy A slide the cartridge stopper assy to the left B and the remove the cartridge stopper assy C Figure 4 18 SCN harness 4P connector Screws Screws Scanner unit Ground leaf spring Scanner...

Page 57: ...hold roller and remove the cartridge guide L by loosening the screw and releasing the hook then pull out feed flat cable 20P Screw Figure 4 22 Note When installing the paper feed chassis unit screw the left chassis of this paper feed chassis unit set the paper tray displace the right chassis of this unit up to the paper tray and screw them Hook the rear side Cartridge hold roller Pliers Figure 4 2...

Page 58: ...er to subsection 1 22 2 Remove the separation pad assy by pulling it out from the paper feed guide upper Figure 4 24 3 Remove the spring from the separation pad assy Figure 4 25 Separation pad assy Separation pad spring Paper feed chassis unit Paper feed guide upper Paper pick up roller assy Paper pick up roller collars Separation pad assy ...

Page 59: ...ze SW PCB Assy 1 Put the 3 chassis L tabs to their original position Tabs 2 solenoid harness connector 2 screws Paper feed motor harness connector Figure 4 27 2 Unplug the 2 solenoid connector and the paper feed motor harness connector 3 Loosen the 2 screws of the size sw PCB Size switch spring Size SW PCB 1 16 Side Switch Spring 1 Pull out the size switch spring P feed size SW PCB assy ...

Page 60: ...rings from the roller holder This operation should be carried out with the PCB removed 1 19 PE Sensor Actuator MP 1 Pull out the actuator by shifting it to the right from the chassis hole Figure 4 30 Figure 4 31 Figure 4 29 MP paper detection actuator Roller holder MP paper detection actuator PE sensor actuator MP Regist sensor actuator Regist sensor actuator PE sensor actuator MP ...

Page 61: ... the PE actuator link from the PE sensor actuator tray 2 Remove the PE actuator link from the tray sensor holder 3 Remove the PE sensor actuator tray from the tray sensor holder 4 Remove the DU detection actuator from the tray sensor holder Roller holder Screws Figure 4 32 1 21 Roller Holder 1 Remove the gear 28 2 Loosen and pull out the 2 screws DU detection actuator PE actuator link Tray sensor ...

Page 62: ...ving the paper feed unit with the body assembled Paper pick up roller shafts Tray paper pick up gear 35 MP paper pick up gear 35 Bearing Paper pick up roller assy Figure 4 34 Figure 4 35 Paper pick up roller collars Paper pick up roller assy Bearing Paper pick up roller shafts 3 Pull out the paper pick up roller shafts 4 Remove the paper pick up roller collars from the paper pick up rollers assy S...

Page 63: ...y loosening its 2 screws Figure 4 37 Paper pick up solenoid Screw Paper pick up solenoid Screw Screw Screw Paper feed motor assy 2 For each assy loosen a screw and pull out the bearing and the 6 washers See the picture below Figure 4 38 Paper feed roller assy 70s Washer Paper feed roller assy 60 Screws Washer Washer Washer Washer Bearing Screw Bearings Washer ...

Page 64: ...4 40 Figure 4 41 Figure 4 42 2 Remove the MP extension tray from the MP tray cover by bending the former 1 26 MP Tray Assy 1 Remove the MP tray assy from the MP tray cover by bending its bosses Paper feed chassis unit Hook MP tray cover MP extension tray Hook MP extension tray MP tray cover Boss MP tray assy Boss MP tray cover ...

Page 65: ...y can be easily removed if it is slanted Figure 4 44 1 27 Paper Path Separation Plate Paper Path Separation Film 1 Remove them from the paper feed guide lower by bending them Paper feed guide lower Paper path separation plate Paper path separation film Fixing bushes MP tray assy Figure 4 43 Figure 4 45 MP tray assy Boss MP release plate Boss ...

Page 66: ...ver in section 1 6 1 Release the hook of the heater lead wire connector 2P by pinching the connector and pull it out upward to remove it from the low voltage power supply assy 2 Pull out the fixing PCB connector 4P to the rear A 3 Loosen the 2 screws which are securing from the rear and remove the fixing unit by pulling it to the rear Figure 4 47 Paper feed guide upper Hook Hook Latch Heater lead ...

Page 67: ...ure 4 51 5 Loosen 4 screws and remove the thermistor lead wire connector 2P of the fixing PCB see Figure 4 51 and remove the fixing unit cover by detaching the wire from the hooks of the fixing unit chassis Heater support spring Halogen heater Figure 4 48 Screws Fixing unit cover Fixing unit chassis Hooks Screws Screw Connector A A Fixing PCB assy Fixing unit C Halogen heater B A Heater Push A Sup...

Page 68: ... 53 2 Remove the retaining rings on both sides 3 Remove the HR gear loosen the screw and remove the spring washer remove the left and right HR bearings and the heat roller by sliding it Figure 4 54 Screws Heat insulation cover Retaining ring HR bearing Screw HR bearing Heat roller HR gear Retaining ring Spring washer Pressure roller bearing Pressure roller spring Fixing unit chassis Pressure rolle...

Page 69: ...ook and take off the left bearing white from the hook A Lift the left side B slide it to the left C and take off the roller shaft from the right bearing black D 4 Remove the transfer roller assy Caution Do not touch the sponge rubber roller when replacing the transfer roller the roller with hand grease or clasped too strongly may result in poor printing quality Figure 4 57 Figure 4 56 Main chassis...

Page 70: ...1 32 PS Switch Wire Remote Switch 1 Pull out the PS switch wire from the remote switch and the switch attachment Lift slightly the wires when pulling them out This is in order to release the chassis caught at 2 places 2 Remove the remote switch from the chassis Paper delivery holder spring DC gear unit PS switch wire Remote switch Gear 48 Gear 48 spring Gear 24 72 Gear 20 50 Gear 39 3 screws DC ge...

Page 71: ...ws on the top Figure 4 63 Figure 4 62 1 34 Low Voltage Power Supply PCB Assy 1 Be sure to remove the heat insulation cover before removing the low voltage power supply block Figure 4 64 Resin spacers Screws The PCB can be detached without removing this spacer Resin spacers Heat insulation cover Heat insulation cover Screw Low voltage power supply PCB assy PS switch wire Screw Screw Screw Screw Hoo...

Page 72: ...ay 1 Release the roller holder fixing pawl and remove the roller holder by pulling it out upward 2 Remove the roller 3 Remove the separation pad assy pull it out by turning it Figure 4 66 Separation pad assy and spring Roller holder fixing pawl Paper tray Roller holder Toner cartridge lid EP ED Cartridge Roller ...

Page 73: ...IV 26 4 Remove the tray gear holder from the other side by loosening the 3 screws and remove the gear 56T link Figure 4 67 Screws Tray gear holder Gear 56T link ...

Page 74: ... to be replaced periodically to maintain product quality at same level in other words the parts which would affect the product greatly if they lost their function even if they are not damaged or there is no change in their appearance It is recommended to replace such parts on the occasion of a periodical service which is carried out before or after the specified number of sheets are used whichever...

Page 75: ...iver Flat blade screwdriver Precision flat blade screwdriver 11 13 14 15 Allen wrench set 12 File fine Allen hex screwdriver Diagonal cutting pliers Needle nose pliers 16 18 19 20 Pliers 17 Snap ring pliers ext 19 30 mm Crimper Tweezers Ruler 21 23 24 25 Mallet plastic head 22 Brush Penlight Bottle plastic Solder 26 28 29 30 Desoldering wick 27 Oiler Jar plastic Digital logic tester Digital multim...

Page 76: ...astic rubber and external parts Purchase locally 1 MEK methyl ethyl ketone CH3 CO C2 H5 Cleaning for oil and toner stains Purchase locally Highly flammable keep away from flame 2 Lubricating oil silicon grease KS64F For fuser Tool No ZX 43D Equivalent oil may be used 3 Lubricating oil Moly kote EM 30L For drive mechanism Tool No ZX 43N Equivalent oil may be used 4 Table 5 3 ...

Page 77: ...tus display when a cartridge is installed in the printer If the message is displayed replace the cartridge with a new one If blank spots occur on prints take out the EP ED cartridge and slowly rock it to distribute the toner evenly 4 Others Check if The transfer guide and feed guide are clean If not clean them with a damp cloth Condensation When the printer is moved from a cold room into a warm ro...

Page 78: ...CHANICAL CHECK 2 1 Test Printing If an image problem occurs follow the procedure below to produce a test print 1 Enter the offline mode 2 Press the SHIFT and TEST switches simultaneously so the printer enters the test print mode 3 Press the or switch to appear the message TEST PRINT then press the SET switch The message 05 TEST PRINT will appear on the status display of the control panel and the D...

Page 79: ... All black I 6 Dirt on back of paper I 7 Black vertical streaks I 8 Black and blurred vertical stripes I 10 Black and blurred horizontal stripes I 11 Dropout I 12 White vertical streaks I 13 Faulty registration I 14 Poor fixing I 5 Polka dots I 9 Black and thin horizontal streaks Figure 6 2 ...

Page 80: ...o 0V just when the voltage at the 7 pin changes from 0V to 15V Replace the main PCB assy or the harness Dirt on power supply terminal Failure in the transfer high voltage circuit Clean the transfer roller right end bearing the check continuity between the transfer roller power supply spring and the terminal of the high voltage transfer unit Is there continuity Clean the contact to assure the conti...

Page 81: ...proper setting on the control panel I 2 Dark Possible cause Step Check Result Remedy EP ED cartridge Is there any dirt on the cartridge side charging terminal of the transfer unit and on the terminal of the high voltage power supply charging unit is there continuity between them 5 No Clean the terminal to assure the continuity Yes Replace the high voltage power supply PCB assy 2 Does printed image...

Page 82: ...oved Replace the scanner unit or the harness Replace the high voltage power supply PCB assy Yes No 1 Yes Beam detection error Is the printer hung up with the PRINT message remaining on the display even after a printing when only a copy is printed Replace the scanner unit or the harness I 4 All black Possible cause Step Check Result Remedy EP ED cartridge 2 Does printed image improve when the EP ED...

Page 83: ...id in the printer pull out the EP ED cartridge and remove the paper in the printer Is there already dirt on the back of the sheet thus removed No Go to Step 6 3 Is there any dirt on the transfer roller Yes Clean the transfer roller and if the dirt remains replace the transfer roller assy Transfer input signal error 4 Does the voltage at the 6 pin HVT1 of the connector P6 on the main PCB change fro...

Page 84: ...k Result Remedy Fixing unit damaged Replace the fixing unit No I 7 Possible cause Step Check Result Remedy Drum or charging roller failure 1 Do stripes appears at 95 mm or 38 mm interval Yes Replace the EP ED cartridge Fixing unit failure 2 Do stripes appears at 80 mm interval Yes Replace the fixing unit Black and blurred horizontal stripes I 10 1 Beam detection error I 9 Black and thin horizontal...

Page 85: ...anges from 0V to 15V No Replace the main PCB assy or the harness Dirt on power supply terminal 6 No Clean the contact to assure the continuity Failure in the transfer high voltage circuit Clean the transfer roller right end bearing the check continuity between the transfer roller power supply spring and the terminal of the high voltage transfer unit Is there continuity Replace the high voltage pow...

Page 86: ...ssemble the actuator and if the problem is not resolved replace the actuator Regist sensor failure 8 Is the voltage at the pin 5 of the connector P3 of the main PCB 5V when no paper passes and 0V when paper passes No Replace the paper feed size sw PCB assy or the harness and if the problem remains replace the main PCB assy Paper feed roller failure Yes Replace the paper feed roller assy Possible c...

Page 87: ...y PCB have the short circuit between 24V and 0V 5V and 0V or 24V and 5V Yes Replace the PCB having the short circuit Low voltage power supply PCB Main PCB LV harness DC fan motor 2 Yes Replace the low voltage power supply PCB assy No Replace the main PCB assy the LV harness or the DC fan motor No DC power supplied M 1 Possible cause Step Check Result Remedy LCD module 1 Yes No Replace the main PCB...

Page 88: ...voltage of the following signals change from 5V to 0V Signal SW8 SEL SW7 MODE EMULATION SW6 FONT ECONOMY SW5 FORM FEED FEEDER SW4 SET COPY SW3 CONTINUE SHIFT SW2 DOWN RESET SW1 UP TEST Main PCB P1 8 P1 10 P1 12 P1 14 P1 16 P1 18 P1 20 P1 21 Panel PCB P1 14 P1 12 P1 10 P1 8 P1 6 P1 4 P1 2 P1 1 No Replace the control panel unit or the switch flat cable Malfunction of control panel switches M 4 Is th...

Page 89: ...flat cable Does the voltage of P3 3 or P3 14 in the main PCB connector rise from 0V to 5V when the paper empty sensor is covered or even if a paper is set on MP tray XX is MP T1 T2 4 Yes Possible cause Step Check Result Remedy 1 No 2 Yes 3 Yes 4 No M 8 14 NO CARTRIDGE is displayed EP ED cartridge Is an EP ED cartridge installed correctly Install the EP ED cartridge correctly Clean the electrode of...

Page 90: ...ce the main PCB assy No Main PCB M 9 16 TONER EMPTY is displayed Possible cause Step Check Result Remedy Actuator 1 Does the actuator of the paper delivery sensor or the registration sensor operate smoothly No Reassemble or replace the paper delivery actuator and regist sensor actuator Fuser harness Feed flat cable 3 Does the voltage of P11 1 in the main PCB connector rise from 0V to 5V when the e...

Page 91: ...rectly Main PCB 2 Does the voltage of P3 20 or 19 in the main PCB connector rise from 0V to 5V and is a pulses having about 11ms period generated at P3 6 7 8 9 pin No Replace the main PCB assy No paper pick up from cassette or MP tray M 12 Feed flat cable 3 Does the voltage of P5 20 or 19 in the paper feeder PCB Connector rise from 0V to 5V and is the pulses having about 11ms period generated at P...

Page 92: ...or P4 turned on and off No Replace the HV harness M 13 Yes Replace the high voltage power supply PCB assy 55 HIGH VOL MALF is displayed Faulty output from the H V P S ASSY High voltage power supply PCB Pin No Signal name Voltage reference value Remarks HV1AC 0V 5 8V HV1DC 0V 8 6V DBAC 0V 6 3V DBDC 0V 8 6V DNSTY 1 0 4 0V HVT1 0V 8 7V HVT2 0V 15 1V HVT3 0V 9 0V HVT4 0 4 5 0V HVTFB 0 4 4 0V TONER1 0 ...

Page 93: ...ain PCB 5 Make sure if The EP ED cartridge is installed in the printer correctly The upper cover of the printer is closed A paper loaded cassette is mounted No Replace the main PCB assy Note When the printer has detected a fixing unit malfunction do not power on for about 15 minutes Even if the power is on the printer will shut off the power supply to the fixing heat roller to prevent the fixing t...

Page 94: ...ry problem remove the paper used when the error occurred and continue to print Possible cause Step Check Result Remedy Main PCB 1 Does this problem frequently occur No 41 PRINT CHECK is displayed M 17 Replace the main PCB assy Yes ...

Page 95: ...owing three blocks 1 The paper pick up block The LCD display JAM TRAYS 2 The separation and feed block The LCD display JAM INSIDE 3 The fixing and paper delivery block The LCD display JAM REAR Therefore remedies for paper jam problems are described Respectively for these three blocks Figure 6 3 3 2 1 ...

Page 96: ...Yes Is the separation pad deformed or worn or is it detached Replace the pad assy For solenoid activation no feeder motor operation and no regist sensor activation refer to the item NO PAPER PICK UP FROM THE CASSETTE in the column MALFUNCTIONS Possible cause Step Check Result Remedy 2 No 3 4 Paper front guide J 1b Paper pick up block Oblique feed jam No No Is the paper front guide set in the corre...

Page 97: ...he fixing unit Clean the entrance guide Yes 3 Is the separation guide worn or deformed Is the paper sensor arm movement smooth Yes Replace the fixing unit Fixing and paper delivery block Paper jam 4 No Replace the jam remove cover and the rear cover assy 5 Is the entrance guide dirty Paper delivery actuator No Replace the changeover guide Is the changeover guide movement smooth Is the delivery rol...

Page 98: ...ed Instruct the user to use recommended type of paper Paper pick up block Fixing unit entrance guide Fixing unit Is the entrance guide dirty Is the position of the adjustment lever of the cassette corresponding to the paper sheet size Possible cause Step Check Result Remedy Print paper 1 No Instruct the user to use recommended type of paper Adjustment lever spring pressure switching lever 2 Yes Re...

Page 99: ...e is set to A4 size TRAY 2 LETTER Appears when the cassette is set to letter size TRAY 2 NO Appears when no cassette is set CASSETTE ERROR Appears in case of error 9 Press the CONTINUE switch to check multi purpose tray MP TRAY Set paper on the MP tray MP TRAY OK 3 Press the SET switch to check if the LCD comes on All the LCD elements will come on simultaneously 4 Press the CONTINUE switch to chec...

Page 100: ...off the power Note The checks on and after 10 are carried out automatically and if an error is detected on of the following messages will be displayed Checks can be resumed if the CONTINUE switch is pressed FONTCART ERROR Font cartridge error this message is displayed if a font cartridge than a Hewlett Packard Company C2053A C01 Word Perfect is used NO FONTCART No font cartridge is set FLASH ERROR...

Page 101: ... READ data The following table is the reference Address Part replacement Lower order address 0 4 8 C 2 6 A E Replace with SIMM corresponding to memory map 1 32 21 16 17 2 Table 6 1 Video Controller DRAM Address Corresponding Table 1 Replace the DRAM on the Main PCB 2 Replace the SIMM Note1 There may be the case that the above sequence doesn t work correctly according to the contents of RAM failure...

Page 102: ... removed while the printer is on line The duplex unit is not installed with the printer when the duplex printing mode is selected The duplex paper guide tray is not installed in T1 when the duplex printing mode is selected The cover of the duplex unit is open Load a stack of paper into the cassette See M 7 Close the cover See M 6 Remove the jammed paper from the indicated area See M 10 Install a t...

Page 103: ... printer Wait a few seconds then turn it on again Reduce the input buffer size Turn off KEEP PCL Add SIMM memory with power off Download font and the font saved in the HDD card might cause the error for it occupies the same work area as the RAM Memory expansion is recommended in that case When the serial interface is used check the communications parameters such as baud rate code type parity and h...

Page 104: ... referring to the printed error message Install the MIO card correctly Check the interface cable connection between the printer and the fitted option Use a new card If the same error occurs consult your dealer or service personal Set the correct size of paper in T2 or for duplex printing Press the RESET switch Card overflow Card write error Incorrect installation of SIMMs Error in communication wi...

Page 105: ...the printer Wait a few seconds then turn it on again Turn off the printer Wait a few seconds then turn it on again Turn off the printer Wait a few seconds then turn it on again Turn off the printer Wait a few seconds then turn it on again If still remains replace the main PCB Turn off the printer Wait a few seconds then turn it on again If still Malfunction of fuser Malfunction of laser beam detec...

Page 106: ...e main PCB Turn off the printer Wait a few seconds then turn it on again If still remains replace the main PCB Turn off the printer Wait a few seconds then turn it on again If still remains replace the main PCB Turn off the printer Wait a few seconds then turn it on again If still remains replace the main PCB Instruction bus error Data bus error Privileged instruction Illegal instruction No fpu 99...

Page 107: ... UP SOLENOID PICK UP MOTOR TRAY1 PICK UP SOLENOID P1 6 2 2 5 P3 P4 P2 5 P1 DU PD SENSOR MP PE SENSOR T1 PE SENSOR TAIL SENSOR REGIST SENSOR MOTOR CLUTCH DRIVER P5 20 20 P3 6 4 P9 P10 6 4 P1 SCANNER MOTOR DRIVER SCAN MOTOR 16 P4 P6 8 16 8 MAIN MOTOR 4 P7 3 P12 21 P1 P5 P2 P13 P8 RISC CPU P11 4 P4 8 5V 5VB 24V 24VB ENGINE CPU 48 P14 48 P16 48 P17 48 MIO BOARD MIO INTERFACE RS232C INTERFACE CDCC INTE...

Page 108: ...Appendix 2 Paper Feed Size SW PCB Circuitry Diagram 1 1 A 2 CODE NAME UK2516000 B48K139 140CIR JW 27 95 P053 ...

Page 109: ...Appendix 3 Main PCB Circuitry Diagram 1 7 CODE UK3787000 B48K294 295CIR 1 7 NAME A 3 ...

Page 110: ...Appendix 4 Main PCB Circuitry Diagram 2 7 CODE UK3787000 B48K294 295CIR 2 7 NAME A 4 ...

Page 111: ...Appendix 5 Main PCB Circuitry Diagram 3 7 CODE UK3787000 B48K294 295CIR 3 7 NAME A 5 ...

Page 112: ...Appendix 6 Main PCB Circuitry Diagram 4 7 CODE UK3787000 B48K294 295CIR 4 7 NAME A 6 ...

Page 113: ...Appendix 7 Main PCB Circuitry Diagram 5 7 CODE UK3787000 B48K294 295CIR 5 7 NAME A 7 ...

Page 114: ...Appendix 8 Main PCB Circuitry Diagram 6 7 CODE UK3787000 B48K294 295 CIR 6 7 NAME A 8 ...

Page 115: ...Appendix 9 Main PCB Circuitry Diagram 7 7 CODE UK3787000 B48K294 295CIR 7 7 NAME A 9 ...

Page 116: ...Appendix 10 Control Panel PCB Circuitry Diagram 1 1 A 10 CODE NAME UK2527000 B48K143CIR ...

Page 117: ...Appendix 11 Scanner LD PCB Circuitry Diagram 1 1 A 11 CODE NAME UK2674000 B48K165CIR ...

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Brother 1660e - B/W Laser Printer, Service Manual

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Summary of Contents for 1660e - B/W Laser Printer

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