Brother MFC-4820C Service Manual Download Page 106

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6-21

Main PCB

Ink cartridge sensor harness

Media flat cable 2
Media flat cable 1

Head flat cable 1

PF encoder flat cable

Head flat cable 2

Hook switch harness

USB-main harness

CIS flat cable

Backup battery harness

NCU-main harness

Modular harness

Speaker harness

Power supply harness
(power-main), black

Panel-main harness

Sensor harness (ASF-main)

Driver flat cable 1

Driver flat cable 2

Driver PCB

Power supply harness
(power-driver), red

Driver flat cable 1

Driver flat cable 2

CIS travel motor harness

PF/air pump motors harness

ASF/CR/purge motors harness

Reassembling Notes

• For routing of the harnesses, refer to "Routing A, B, C, and D" in Section 6.1.15, "Routing of the

Harnesses and Flat Cables."

• After replacing the driver PCB, be sure to follow steps in the flowchart given on the next page.
• When you replace the driver PCB with a new one, also replace the ink absorber box assy with a

new one.

Summary of Contents for MFC-4820C

Page 1: ...FACSIMILE EQUIPMENT SERVICE MANUAL MODEL MFC4820C MFC4420C ...

Page 2: ...ht Brother 2003 All rights reserved No part of this publication may be reproduced in any form or by any means without permission in writing from the publisher Specifications are subject to change without notice ...

Page 3: ...uately understand and apply this manual This manual is made up of eight chapters and appendices SAFETY INSTRUCTIONS CHAPTER 1 PARTS NAMES FUNCTIONS CHAPTER 2 SPECIFICATIONS CHAPTER 3 SETTING UP OF THE MACHINE CHAPTER 4 THEORY OF OPERATION CHAPTER 5 ROUTINE MAINTENANCE CHAPTER 6 DISASSEMBLY REASSEMBLY CHAPTER 7 MAINTENANCE MODE CHAPTER 8 TROUBLESHOOTING Appendix 1 Serial No Descriptions Appendix 2 ...

Page 4: ...be careful not to put your fingers in the area shown in the illustration Use caution when installing or modifying telephone lines Never touch telephone wires or terminals that are not insulated unless the telephone line has been disconnected at the wall jack Never install telephone wiring during a lightning storm Never install a telephone jack in a wet location unless the jack is specifically desi...

Page 5: ...esk Put the machine near a telephone jack and a standard grounded power outlet Choose a location where the temperature remains between 50 F and 95 F 10 and 35 C Avoid placing your machine in a high traffic area Do not place near heaters air conditioners water chemicals or refrigerators Do not expose the machine to direct sunlight excessive heat moisture or dust Do not connect your machine to elect...

Page 6: ...CHAPTER 1 PARTS NAMES FUNCTIONS ...

Page 7: ...CHAPTER 1 PARTS NAMES FUNCTIONS CONTENTS 1 1 EQUIPMENT OUTLINE 1 1 1 2 CONTROL PANEL 1 3 1 3 COMPONENTS 1 5 ...

Page 8: ...4 Paper guide 3 PhotoCapture media slot 2 Output paper support 1 Output paper support extension 10 Control panel 9 Scanner cover release lever 8 Scanner cover 7 Document cover Rear view 13 USB interface connector 12 Telephone line jack 11 External telephone line jack ...

Page 9: ...paper here 6 Paper support Unfold to support paper 7 Document cover Open to place the original on the scanner glass 8 Scanner cover Open to install an ink cartridge or to remove jammed paper 9 Scanner cover release lever Pull to open the scanner cover 10 Control panel Use the keys and display to control the machine 11 External telephone line jack Plug in the modular plug on the external telephone ...

Page 10: ...record telephone calls Erase Lets you delete voice messages all fax messages or all messages Speaker Phone Lets you dial telephone and fax numbers and speak to another party without lifting the handset Hold Lets you place calls on hold Redial Pause Redials the last number you called It also inserts a pause in auto dial numbers Displays messages on the screen to help you set up and use your machine...

Page 11: ...esolution when you send a fax Search Speed dial Lets you look up numbers that are stored in the dialing memory It also lets you dial stored numbers by pressing and a two digit number Volume When using the speaker or listening to the ring you can press this key to adjust the volume Menu Set Lets you access the Menu to program and store your settings in the machine Press to scroll forward or backwar...

Page 12: ...unt ASF Main PCB Bottom plate NCU PCB Purge unit Power supply PCB Driver PCB Modular PCB Media module Rear cover L USB PCB Ink cartridge support base Ink cartridge PCB Ink absorber box Enclosure cover Lower cover Scanner unit Control panel ASSY Provided on the MFC4820C ...

Page 13: ...CHAPTER 2 SPECIFICATIONS ...

Page 14: ...CHAPTER 2 SPECIFICATIONS CONTENTS 2 1 GENERAL 2 1 2 1 1 General Specifications 2 1 2 1 2 Paper Specifications 2 1 2 1 3 Printable Area 2 4 2 1 4 Environmental Conditions 2 5 2 2 OTHERS 2 6 ...

Page 15: ...Best Print Quality 68 to 91ºF 20 to 33ºC Power Source 120 VAC 50 60 Hz U S A and Canadian version only Power Consumption Standby under 9 7 watts Operating under 50 watts Dimensions 18 2 x 18 5 x 10 1 inches 462 x 469 7 x 255 5 mm Weight 18 3 lb 8 3 kg with components 2 1 2 Paper Specifications Recommended paper Plain Paper Xerox 4200 Inkjet Paper KODAK Premium Inkjet Paper Matte Glossy Paper JETPR...

Page 16: ...COM 10 C5 Monarch 10 Postcard 4 x 6 30 Index Card 5 x 8 30 Paper Specifications for the Paper Tray Cut Sheet Paper Weight Plain paper Inkjet paper 17 to 32 lb 64 to 120 g m2 Glossy paper Up to 40 lb 150 g m2 Post card Up to 45 lb 170 g m2 Index card Up to 32 lb 120 g m2 Thickness Plain paper Inkjet paper 0 003 to 0 006 in 0 08 to 0 15 mm Glossy paper Up to 0 007 in 0 18 mm Envelopes Up to 0 02 in ...

Page 17: ...damaged curled wrinkled or irregularly shaped 0 08 in or longer 0 08 in or longer 0 08 in or longer that are extremely shiny or highly textured that were previously printed by a laser printer that cannot be arranged uniformly when stacked that are made with a short grain Do not use envelopes that are of a baggy construction that are embossed have raised writing on them that have clasps on them tha...

Page 18: ... 0 02 0 12 0 02 Letter A4 Copy 0 12 0 12 0 12 0 12 Executive Legal Printer 0 12 0 12 0 12 0 12 Copy 0 12 0 12 0 12 0 12 Cut sheet A5 Printer 0 12 0 12 0 12 0 12 Post card 4 x 6 Printer 0 12 0 47 0 12 0 12 0 12 Index card 5 x 8 Printer 0 12 0 02 0 12 0 02 0 12 0 02 0 12 0 02 Envelopes DL COM 10 C5 Monarch Printer 0 67 0 67 0 12 0 12 When you set the Near Edge printing feature to ON Printer depends ...

Page 19: ...2 5 2 1 4 Environmental Conditions ...

Page 20: ...Inkjet Glossy Transparency INK JET JETPRINT Photo proofing paper GLOSSY JETPRINT Professional Photo Paper INK JET JETPRINT Photo proofing paper GLOSSY JETPRINT Professional Photo Paper LCD Size Standard size 16 characters x 2 lines Standard size 16 characters x 2 lines LCD Back Light N A Yes On Screen Programming Yes Yes LCD Language English English Memory Capacity physical Mbytes 16 Mbytes RAM 16...

Page 21: ... Starter Ribbon Ribbon Life Yield size x meters of cartridge Starter Ink N A N A Ink Cartridge Life Yield BK 480pages Draft 5 BK 480pages Draft 5 C M Y 400pages Draft 5 C M Y 400pages Draft 5 Options SERVICE INFORMATION Monthly Volume 2500 pages month 2500 pages month Machine Life year 30 000 pages or 5 years 30 000 pages or 5 years Periodical Replacement Parts for Laser Fixing Unit Separation Pad...

Page 22: ...g Size LTR LEGAL A4 LTR LEGAL A4 Delayed Timer Yes up to 50 B W only Yes up to 50 B W only Polled Sending type Yes Std Seq B W only Yes Std Seq B W only Multi Transmission N A N A Multi Resolution Transmission N A N A Next Fax Reservation Yes Dual Access Yes Dual Access Batch Transmission Yes B W only Yes B W only Call Reservation Over Auto TX N A N A Call Reservation Over Manual TX N A N A Quick ...

Page 23: ...s 3 sizes Yes 3 sizes Minimum Droplet Size 5 pl 5 pl Shingling Print N A N A Color Enhancement Yes Yes COLOR COPY Color Mono Color Color Speed cpm time calculated excluding paper 10 6ppm Mono Color 600x150 dpi 10 6ppm Mono Color 600x150 dpi First copy out time from READY mode 4 Warm up Time from SLEEP mode 0 seconds 0 seconds Multi Copy Stack Yes Up to 99 Yes Up to 99 Multi Copy Sort N A N A Reduc...

Page 24: ...Auto Installer Program Win98 SE Me 2000 XP with Auto Installer Program Bundled software Pop Up Menu Brother Control Center Win98 SE Me 2000 XP with Auto Installer Program Win98 SE Me 2000 XP with Auto Installer Program Bundled software Scan to feature Win98 SE Me 2000 XP with Auto Installer Program Win98 SE Me 2000 XP with Auto Installer Program Bundled software PhotoPrinter4 0 Editor software Win...

Page 25: ...rint JPEG Scan to Card JPEG PDF Color TIFF B W Photo Print JPEG Scan to Card JPEG PDF Color TIFF B W Color Enhancement Yes True2Life Yes True2Life Media Drive Yes Yes Scan to Card Yes Yes Data Management with Network board NETWORK Standard Option User Option or Dealer Option Model Name Share Printer Share Scanner Share PC FAX Internet FAX ITU SUB Addressing Support OS version Support OS version Su...

Page 26: ...CHAPTER 3 SETTING UP OF THE MACHINE ...

Page 27: ...Set up Location 3 1 3 2 UNPACKING THE MACHINE 3 2 3 3 INSTALLATION WORK 3 3 3 3 1 Removing the Protective Parts 3 3 3 3 2 Attaching the Paper Tray 3 3 3 3 3 Loading Paper 3 4 3 3 4 Setting the Handset 3 5 3 3 5 Connecting the Telephone Line Cord and Power Cord 3 5 3 3 6 Installing the Ink Cartridges 3 7 3 3 7 Color Block Quality and Alignment Checks 3 10 ...

Page 28: ...r example next to a window b Where it is likely to suffer a big difference in temperature and humidity between the maximum and minimum levels Normal operation environment is within 10 C to 35 C 20 to 80 RH and without any condensation c Where it is likely to be in a draft of cold air from an air conditioner or warm air from a heater or to receive direct radiant heat d Where it is likely to be exce...

Page 29: ...3 2 3 2 UNPACKING THE MACHINE The equipment consists of the following major components ...

Page 30: ...he Protective Parts 1 Remove the protective tape Do NOT connect the USB cable Connecting the USB cable is done when installing the driver 3 3 2 Attaching the Paper Tray 1 Insert the paper tray from above into the back of the machine Paper tray ...

Page 31: ...aper well to avoid paper jams and mis feeds 2 Unfold the paper support and then press and slide the paper guide to fit the paper width Paper support Paper guide 3 Gently insert paper Make sure the print side is towards you and the paper is below the maximum paper mark Print side Paper Maximum paper mark ...

Page 32: ... to the handset 3 3 5 Connecting the Telephone Line Cord and Power Cord 1 Connect the power cord Power cord 2 Connect the telephone line cord Connect one end of the telephone line cord to the jack on the machine marked LINE and the other end to a modular wall jack Do not connect the USB cable yet ...

Page 33: ... when you connect it to a telephone line Similarly you can protect yourself when you want to move your machine by disconnecting the telephone line first and then the power cord NOTE If you are sharing one phone line with an external telephone connect it as shown below NOTE If you are sharing one phone line with an external telephone answering machine connect it as shown below Please select Receive...

Page 34: ... lift it to the opening position Scanner cover release lever Scanner cover 3 Lift the output paper support and ink cartridge cover Output paper support Ink cartridge cover 4 Remove the yellow plastic protective cartridges Protective cartridge NOTE Do not throw away the yellow plastic protective cartridges You will need them in the future to transport the machine ...

Page 35: ...the first time This process will occur only once the first time ink cartridges are installed The preparation process will last up to four minutes Output paper support Ink cartridge cover Scanner cover DO NOT remove ink cartridges if you do not need to replace them If you do so it may reduce the ink quantity and the machine will not know the quantity of ink left in the cartridge DO NOT shake the in...

Page 36: ...nty coverage does not apply to any problem that was caused by the use of unauthorized third party ink and or cartridges To protect your investment and guarantee your print quality please continue to replace consumed ink cartridges with only Genuine Brother Branded Supplies DO NOT insert and remove the cartridges repeatedly If you do so the ink may seep out of the cartridge DO NOT peel a film off t...

Page 37: ...QUALITY CHECK SHEET only during initial ink cartridge installation Step A Color Block Quality Check 1 The LCD shows Check the quality of the four color blocks formed by the short lines printed on the sheet BLACK CYAN YELLOW MAGENTA 2 If all lines are clear and visible press the 1 key on the dial pad to skip to STEP B Alignment Check OR If you can see missing short lines press the 2 key on the dial...

Page 38: ... you have finished selecting the 1 key YES or the 2 key NO for each color the LCD shows Press the 1 key YES and then machine starts cleaning the colors After cleaning is finished press the Fax Start key The machine starts printing the PRINT QUALITY CHECK SHEET again and goes back to the first step of STEP A ...

Page 39: ...matches it If another test print number is a better match for either 600 DPI or 1200 DPI press the 2 key to select NO and go to 2 2 For 600 DPI select the number from 1 to 8 that most closely matches the No 0 sample and enter it using the dial pad 3 For 1200 DPI enter the number from 1 to 8 that most closely matches the No 0 sample The Quality check is now complete ...

Page 40: ...CHAPTER 4 THEORY OF OPERATION ...

Page 41: ...2 1 Auto Sheet Feeder ASF mechanism 4 7 4 2 2 2 Paper feeding and ejection mechanism 4 9 4 2 3 Printing mechanism 4 11 4 2 3 1 Ink supply and ink jet mechanism 4 12 4 2 3 2 Head cap mechanism 4 21 4 2 3 3 Purging mechanism 4 22 4 2 3 4 Carriage drive mechanism 4 29 4 2 4 Sensors and Actuators 4 31 4 3 CONTROL ELECTRONICS 4 34 4 3 1 Configuration 4 34 ...

Page 42: ...eeding mechanism Power supply Ink jet printer unit CIS unit CIS travel motor Print head unit Carriage motor Needle tube head flat cable ASSY Air pump motor module Diaphragm pump and its motor Purge motor and purge unit Host Compact Flash SmartMedia Memory Stick ASF motor Paper feed motor Speaker Handset Backup battery Not provided on the MFC4420C ...

Page 43: ...F registration paper feeding and ejection mechanisms ASF motor stepping motor Paper feed motor DC motor Ink supply and ink jet mechanism consisting of air pump motor module print head unit ink cartridges and needle tube head flat cable ASSY Air pump motor DC motor Head capping mechanism Purge mechanism consisting of carriage lock purge unit ink draining head wiper and air vent unit vent rod unit P...

Page 44: ... pump motor encoder Sensors Scanner ink slot cover open sensor ASF switch Registration sensor Paper width sensor Media sensor Ink cartridge sensors Purge cam HP switch Hook switch provided on the MFC4820C Thermistors Head thermistor Casing internal temperature thermistor ...

Page 45: ...The scanner unit consists of a scanner top cover CIS unit CIS drive mechanism and scanner base For details on the sensors refer to Section 4 2 4 Document cover CIS rail CIS drive pulley CIS travel motor Scanner base CIS drive belt Idle pulley spring CIS idle pulley Scanner top cover CIS unit CIS flat cable ...

Page 46: ...ia the gear train to the CIS drive belt The CIS unit which is supported and guided by the CIS rail is secured to the CIS drive belt Clockwise and counterclockwise rotation of the CIS travel motor moves the CIS unit to the left and right respectively The CIS unit uses a built in Contact Image Sensor CIS unit which consists of an LED array for illuminating documents a self focus lens array for colle...

Page 47: ... and the paper feeding and ejection mechanism use an ASF switch and registration sensor respectively For details on these sensors refer to Section 4 2 4 Given below is a sectional view of the right side of the machine that shows the path of the paper as it is fed through the machine Recording paper ASF ASF roller unit Carriage rail Paper feed motor Carriage Paper ejection roller Registration senso...

Page 48: ...rs up so that the paper is held in position with their grooved surfaces When the machine starts a printing operation the ASF motor rotates clockwise as viewed from the output shaft and its rotational torque is transmitted via the planet gear to the paper stopper gear as illustrated below At the same time the ASF roller shaft gear also rotates however its torque will not be transmitted to the ASF r...

Page 49: ... protruding through the center slit in the center base flap ASSY assists in feeding the paper sheet by sheet Between the ASF roller and the paper feed roller is a registration sensor actuator that detects the leading edge of paper and the presence absence of paper When the ASF roller is feeding paper the paper feed roller rotates backwards to register the leading edge of the paper being pulled in ...

Page 50: ...e idle pulley gear paper ejection gear 28B rotates so that the paper ejection roller urethane coated ejects the printed paper The idle pulley holder is spring structured The idle pulley applies tension to PF timing belt 160 5 and prevents the belt from deviating from its designated path On the outer side of the PF roller pulley is a PF encoder disk with a resolution of 300 dpi 0 084 mm pitch Using...

Page 51: ... next sheet of paper by the specified encoder count plus 1 Feeding paper at a constant speed The controller controls the paper feed roller to rotate it at a constant speed even if the load to the drive mechanism fluctuates This control is mostly applied when paper is fed into and ejected from the printer unit after printing that is when a highly precise stop position is not required Control accord...

Page 52: ...d purge motor and the latter two by the carriage motor The ink supply and ink jet mechanism uses ink cartridge sensors The purge mechanism uses a purge cam HP switch For details on these sensors refer to Section 4 2 4 Ink cartridges Ink cartridge sensors Needle ASSYs Paper ejection roller Print head unit Platen Star wheels Purge motor Carriage motor Carriage rail Carriage CR encoder sensor Print h...

Page 53: ...out of those nozzles During an initial purge or reset purge refer to Section 4 2 3 3 however the air pump motor module applies a positive pressure to the rear of the print head unit Such pressure control is called back pressure control NOTE Since the negative pressure prevents the ink from leaking out of the print head unit be sure to place the machine in a horizontal position If you place the mac...

Page 54: ... properties When a particular module is installed in the machine its property data are stored in the EEPROM of the driver PCB The controller manages the motor rpm to generate the positive pressure suitable for that module according to its property data To do this the controller monitors the motor rpm with the air pump motor encoder and accelerates decelerates the motor according to the speed chang...

Page 55: ...e EEPROM in the maintenance mode Function code 68 and replace the property label with the one that comes with the new unit Property code 14 digit 1 Print head unit This machine uses drop on demand ink jet printing The print head has two ink jet units for the four colors of ink Each of these units consists of 75 nozzles 75 channels coated with piezoelectric ceramic PZT a manifold and a filter As il...

Page 56: ...nds print command pulses to the piezoelectric actuator driver circuit embedded in the print head unit 2 Manifold Role as an air buffer There are fine air bubbles in liquid ink These bubbles may gradually increase in diameter as the pressure applied to the ink changes In the channels of the ink jet head see the illustration above the pressure will change as the piezoelectric ceramic actuator operat...

Page 57: ...when positive pressure is applied The structure of the air vent unit is shown below When the carriage reaches the purge position the four vent rods in the purge unit will pop up to push up the corresponding release rods in the air vent unit which in turn will release the four shutoff valves The air vent is located slightly lower than the top of the manifold so that the correct amount of damper air...

Page 58: ...nt type on the ink cartridge sensor PCB and sensor actuators built into the ink cartridges If you insert an ink cartridge filled with ink into the ink slot the built in sensor actuator will interrupt the optical path of the ink cartridge sensor This state will be interpreted as ink present As ink remaining in the chamber decreases the diaphragm will also lower If the diaphragm drops to a certain l...

Page 59: ...he ink empty signaling system designed for this machine is first the software counter that counts the droplets jetted out from each of the ink cartridges after replacement indicates near empty and then the ink empty sensor detects ink empty NOTE In previous models the sensor first detects near empty and then the software counter detects ink empty ...

Page 60: ...hragm refer to page 4 17 Accordingly the check valve will be opened allowing the ink to be supplied As shown below at right even if you insert the needle tip of the liquid processor into either of the two rubber pieces it cannot reach the ink chamber This prevents the ink cartridges from being refilled NOTE If the seal on the rubber pieces is broken or has been removed it is possible that the cart...

Page 61: ...ity and durability to the degree necessary to withstand the high speed movement of the print head unit as well as long term constant and extreme bending Both types of tubing are adhered with primer to protect against chemical and physical damage and to ensure that characteristics necessary to these types of tubing are not compromised Functional breakdown of double layered tube Outer layer silicon ...

Page 62: ... The head cap mechanism is driven by the purge motor in the purge unit The rotational torque of the purge motor is transmitted to the purge cam cam gear 90 via a gear train including the planet gears For details refer to Section 4 2 3 3 The cam on the bottom plane of the purge cam is engaged with the cap cam so that the rotational torque of the purge cam is converted to a straight slide motion The...

Page 63: ... motor drive gears planet gears pump switching unit purge cam cam gear 90 head wiper head cap unit see Section 4 2 3 2 vent rod unit purge cam HP switch and the tube pump When the purge motor rotates counterclockwise as seen from the motor output shaft the rotational torque is transmitted to the purge cam cam gear 90 via the planet gear as shown in the figure below The rotation of the purge cam in...

Page 64: ... Pump gear Tube rollers Tube pump Drain Purge unit Role of the purge cam cam gear 90 The purge cam controls the stopping position of each of the purge functions according to the ON OFF of the purge cam HP switch The cam on the bottom plane of the purge cam is engaged with the cap cam see the figure in Section 4 2 3 2 so the rotational torque of the purge cam is converted to the movement of the str...

Page 65: ...next page Role of the tube pump The tube pump consists of a pump gear and two tube rollers If the pump gear rotates the two tube rollers push out the waste ink tube routed around the pump gear to feed the contents of the tube towards the ink absorber box thereby producing negative pressure Pump gear Tube rollers Tube pump Waste ink tube Role of the head wiper After a purging operation the cam on t...

Page 66: ... rods in the air vent unit of the print head unit This releases the four shutoff valves and air bubbles may be expelled when positive pressure is applied by the air pump motor module Refer to Section 4 2 3 1 2 3 Role of the carriage lock As shown below when the flange on the pump switching cam pushes the bottom end of the lock lever to the rear the top end comes to the front and locks the carriage...

Page 67: ...n 20 sec 0 25 cc Press the 1 key with maintenance code 76 Reset purge This purge is performed to remove any bubbles that have accumulated in the ink supply tubes A reset purge is performed in the following situations When the user selects a reset purge using the function menu provided that there has been no purge performed after the power was switched on After a test print provided that there has ...

Page 68: ...olume of ink in the ink cartridges Type Capacity Usable ink volume Black ink cartridge 16 cc 13 5 cc Color ink cartridge 15 cc 12 5 cc 4 Positive pressure control purge system To prevent air from flowing back into the head nozzles after a purge operation the air pump powered by the purge motor operates simultaneous to the purge being performed This also serves to improve ink jet out reliability Pu...

Page 69: ...rts automatically In the initial purge when the air pump motor module supplies ink from the ink cartridges via the tubes the purge motor simultaneously performs an expulsion operation causing the air bubbles in the manifold in turn to be expelled Ink supply when power is applied for the first time Expulsion close to 2 min Supply of ink by expulsion operation when the power is first applied after s...

Page 70: ...tion based on the carriage home position by using the encoder strip 1 150 dpi pitch attached to the lower chassis of the engine unit The carriage travel speed is 30 15 or 7 5 ips according to the print resolution The controller controls it using PD control Carriage motor CR timing belt Carriage rail CR encoder sensor CR encoder strip CR idle pulley Carriage Engine unit CR motor gear Aging The init...

Page 71: ...bushing according to the rank adjusts the skew of the head nozzles in the direction of Xθ For the adjustment procedure refer to Chapter 6 Section 6 1 2 Fine adjustment of print head skew in the maintenance mode In the maintenance mode you can print out the head skew check pattern and make fine adjustment of the eccentric bushing with Function code 65 alignment of vertical print lines in monochrome...

Page 72: ...allows the controller to determine the registration timing and to check for paper jams The ASF switch detects the switching timing of the forward reverse direction of the ASF motor rotation If the ASF motor rotates in the forward direction the paper stoppers lower to guide the paper to the paper slot If it rotates in the reverse direction the ASF roller rotates to pull in paper The paper width sen...

Page 73: ... head thermistor enables the controller to control the temperature of the print heads According to the change of the thermistor s internal resistance that is monitored the control circuitry regulates the drive voltage applied to the piezoelectric ceramic actuators on each print head as the viscosity of the ink varies depending upon the temperature All the photosensors except the paper width sensor...

Page 74: ... actuator Ink slot cover open sensor actuator Ink cartridge sensors Ink cartridge sensor PCB Purge cam HP switch Purge unit Hook switch Hook switch PCB Air pump motor encoder sensor Not provided on the MFC100 CR encoder strip CR encoder sensor PF encoder disk In casing temperature thermistor PF encoder sensor Paper width sensor Media sensor Head thermistor Engine unit Location of Sensors and Actua...

Page 75: ... Control panel PCB Scanner ink slot cover open sensor SCANNING Main PCB AC line Power supply PCB Driver flat cables Driver PCB Head flat cables Print head PCB Print head Print head Paper width sensor CR encoder Carriage motor ASF ASF switch Sensor PCB Registration sensor ASF motor Purge unit Purge motor Purge HP switch Air pump motor module Air pump motor Pump motor encoder Paper feed motor PF enc...

Page 76: ...CHAPTER 5 ROUTINE MAINTENANCE ...

Page 77: ...1 Cleaning the Exterior of the Machine 5 1 5 1 2 Cleaning the Scanner Glass 5 1 5 1 3 Cleaning the Purge Unit 5 2 5 1 4 Cleaning the Print Head Unit 5 3 5 2 REPLACING THE INK CARTRIDGES 5 4 5 2 1 Replacing the Ink Cartridge 5 4 5 2 2 Checking the Ink Volume 5 6 ...

Page 78: ...alcohol or a cloth dampened with alcohol The letters printed on the control panel might fade or vanish 5 1 2 Cleaning the Scanner Glass If the scanner glass is stained or clouded the print quality of fax document sent or copied will lower To keep the quality print clean the scanner glass Open the document cover Clean the scanner glass and the white film with isopropyl alcohol on a soft lint free c...

Page 79: ...t the middle of the rail 3 Open the scanner unit 4 Clean the two head caps and wiper of the purge unit with a Rubycel stick that is a head cleaner stick provided as a spare part NOTE Do not use a cotton swab that may leave lint on the cleaned sections Lint left on the purge unit will affect the print performance NOTE Use a new Rubycel stick and do not use the used one for any other purge units NOT...

Page 80: ...ead unit by rolling the Rubycel stick lightly on the printing surface NOTE Do not use a cotton swab that may leave lint on the cleaned sections Lint left on the purge unit will affect the print performance NOTE Use a new Rubycel stick and do not use the used one for any other print heads NOTE During the cleaning jobs take care not to scratch the surface of the print head ...

Page 81: ... are empty Be sure to follow the LCD prompts so you replace the color cartridges in the appropriate order 1 Pull the scanner cover release lever and lift the scanner cover 2 Lift the output paper support and open the ink slot cover Ink slot cover Output paper support 3 Remove the ink cartridges that are shown on the LCD Empty ink cartridge If one or more ink cartridges are empty for example Black ...

Page 82: ...e LCD the LCD will ask you to verify that it was a brand new one Example DID YOU CHANGE BLCK 1 YES 2 NO For each new cartridge you installed press 1 on the dial pad to automatically reset the ink dot counter for that color If the ink cartridge you installed is not a brand new one please be sure to select 2 NOTE If you wait until the INK EMPTY XXXX message is displayed on the LCD the machine will a...

Page 83: ...refill the ink cartridges provided with your machine We also strongly recommend that you continue to use only Genuine Brother Brand replacement ink cartridges Using or attempting to use potentially incompatible inks and or cartridges in your machine may cause damage to the machine itself and or it may result in unsatisfactory print quality Our warranty coverage does not apply to any problem that w...

Page 84: ...CHAPTER 6 DISASSEMBLY REASSEMBLY ...

Page 85: ...Supply Insulation Sheet Battery Cover Rear Cover S and Backup Battery 6 16 6 1 5 Rear Cover L Enclosure Cover Power Supply PCB and NCU PCB 6 17 6 1 6 USB PCB Main PCB Modular PCB and Driver PCB 6 19 6 1 7 Document Cover 6 23 6 1 8 Scanner Unit and Control Panel 6 24 6 1 9 Upper Cover and ASF Cover R 6 26 6 1 10 Media Module and Handset Mount Side Cover 6 28 6 1 11 Speaker 6 29 6 1 12 Auto Sheet Fe...

Page 86: ...n conductive sheets such as aluminum foil 6 If any of the self tapping Taptite screws are removed be sure to reinsert them correctly 7 Tighten screws to the torque values listed on the next page 8 When connecting or disconnecting cables hold the connector bodies not the cables themselves If the connector has a lock always slide the lock to unlock the connector 9 After repairs check not only the re...

Page 87: ...2 Media module for grounding wire Screw pan plain washer M4x6 2 0 49 0 1 5 1 Auto Sheet Feeder ASF Taptite bind B M4x12 4 0 98 0 2 10 2 Screw bind M2 6x4 2 0 39 0 1 4 1 Paper tray base ASSY Taptite bind B M2 6x8 2 0 39 0 1 4 1 Center base flap ASSY Taptite bind B M2 6x8 4 0 39 0 1 4 1 Engine unit Shoulder screw 4x10 4 0 98 0 2 10 2 Screw cup M3x5 2 0 69 0 1 7 1 Needle tube head flat cable ASSY Tap...

Page 88: ... head flat cable ASSY leave the print head unit and all four ink cartridges in the machine When removing the print head unit or engine unit you need to remove the ink cartridges and drain the ink from the needle tubes beforehand How to Access the Object Component On the next page is a disassembly flowchart which helps you access the object components To remove the purge unit for example first find...

Page 89: ...or PCB Registration sensor actuator Paper feeding related PF encoder disk Paper feed motor PF timing belts PF encoder sensor Flushing foam cover Purge unit CR encoder strip Print head unit Needle tube head flat cable ASSY NOTE 2 NOTE 3 NOTE 4 NOTE 7 NOTE 8 NOTE 9 NOTE 5 NOTE 6 NOTE 10 For the MFC4820C For the MFC4420C Sensors encoders and thermistors NOTE 1 On the control panel PCB is a scanner in...

Page 90: ...canner open sensor actuator towards you and keep it depressed with adhesive tape This prevents the machine from detecting that the cover is open 4 Open the ink slot cover and pull out all four ink cartridges NOTE Be sure to perform steps 3 and 4 in that order Performing step 4 before step 3 will cause Function code 76 not to be enabled in step 5 5 Carry out initial purge with Function code 76 9 ke...

Page 91: ...iage by hand when the machine is turned off NOTE If you replace the print head unit also replace the ink cartridges with new ones Removing the ink cartridges and draining the ink from the ink tubes 1 Make sure that all four ink cartridges have been removed and that the ink in the ink tubes has been drained Refer to Section 6 1 1 Removing the print head unit 2 Plug the power cord into an outlet mak...

Page 92: ...sor cover Paper width sensor cover Latches Print head unit 7 Take the paper width sensor out of its support in the print head unit below 8 Unlock the FPC connector and disconnect the head flat cable from the print head unit Head flat cable Sensor support Print head unit FPC connector Paper width sensor ...

Page 93: ...ad unit up and towards you Head clamp spring Carriage Carriage rail Head clamp spring Boss b Boss a Ink supply port Engine base plate Bosses b Print head unit NOTE Do not touch the print nozzles the printing ends or ink supply ports to which ink supply tubes are connected of the print head unit doing so will not only stain your hands with ink but also damage the nozzles and or supply ports If you ...

Page 94: ...a new one attach the property label that comes with the new print head unit to the rear left side of the machine Be sure to remove the sensor support from the removed print head unit and attach it to the new one Lower cover Rear Sensor support Print head unit Front Property label for print head unit For air pump motor module For paper feed roller For ejection roller Property code 14 digit Taptite ...

Page 95: ...f the print head unit over the engine base plate See the illustration on page 6 8 15 Pull the head clamp spring out and rotate it to the rear so that the spring will be hooked over bosses a and b shown on page 6 8 and the print head unit clamped in place 16 Make sure that the FPC connector is unlocked Connect the head flat cable to the print head unit and then lock the connector See the illustrati...

Page 96: ... the machine with the battery cover or rear cover S removed Refer to Section 6 1 4 Head skew rank If the head skew rank code e g 2 of the new head unit is less than that e g 3 of the removed one rotate the eccentric bushing to the front by the amount of the difference Front Rear Rotate the eccentric bushing to the front by 2 position markers to the front by 1 position marker No change to the rear ...

Page 97: ...on the printout If any of them are out of the range from 1 8 through 2 2 mm make the machine enter the maintenance mode and press 6 twice again Next press to make the machine ready for data entry Enter the measured values in units of 0 1 mm multiplied by 10 After each entry press Menu Set Make the machine enter the maintenance mode and press 6 twice again Next press 2 to print out margin check pat...

Page 98: ...ttom plate and lift off the plate NOTE Remove the four b screws first a b b b b a a a a a a a Workbench Bottom plate Aluminum evaporated film ASF a Taptite cup B M3x10 b Screw cup M3x5 3 Pull out the EMC plate USB and remove the main insulation sheet See the next page 4 Disconnect the following flat cables from the main PCB see the next page Driver flat cables 1 and 2 Head flat cables 1 and 2 Also...

Page 99: ...nd See the illustration on page 6 20 Not provided on the MFC4420C Main PCB EMC spring plate Lower cover Shield case Main insulation sheet EMC plate MJ Media flat cable 2 Media flat cable 1 Aluminum evaporated film Head flat cable 1 Head flat cable 2 USB PCB PF encoder flat cable CIS flat cable Modular cover Modular PCB Driver PCB NCU PCB Driver flat cable 1 Driver flat cable 2 Taptite cup B M3x10 ...

Page 100: ...n 6 1 15 Routing of the Harnesses and Flat Cables A and B As shown on the previous page route the aluminum evaporated film and pass it through the slit provided in the rear left corner of the main insulation sheet As shown on the previous page insert the EMC plates USB and MJ between the lower cover and the shield case ...

Page 101: ...ry harness with the power cord unplugged you will lose the settings e g calendar clock voice messages and received FAX data stored in the RAM on the main PCB If you need to remove the main PCB without replacing it with a new one in the following disassembly jobs take the backup battery out of the machine once and connect the battery harness to the main PCB without routing it through the opening pr...

Page 102: ...PCB see the illustration on the next page Power supply harness power main black NCU main harness white 4 Disconnect the power supply harness power driver red from the driver PCB 5 Remove the screw from the enclosure cover and lift it up and out of the machine together with the power supply PCB and NCU PCB 6 Pull the latches of the enclosure cover outwards and take out the power supply PCB 7 Pull t...

Page 103: ... Speaker harness CIS travel motor harness Panel main harness Sensor harness ASF main Main PCB This core is provided for European model only This core is provided for European model only Reassembling Notes When setting the power supply PCB into the enclosure cover secure the power cord to the enclosure cover with a cord binder by passing the binder through holes provided in the enclosure cover For ...

Page 104: ...1 4 disconnect it here If it is necessary to prevent the settings stored in the RAM from being lost refer to the instructions given in Section 6 1 4 3 Remove four screws h from the main PCB and lift it up and off 4 MFC4820C Remove screw j from the modular cover and take it off together with the modular PCB If the modular harness has not been disconnected from the main PCB disconnect it from the mo...

Page 105: ...nsor harness ASF main Speaker harness CIS travel motor harness Modular cover Modular harness Modular PCB Lower cover Driver PCB h h h h i i i i g j RF air pomp motors harness ASF CR purge motors harness This wire s core is provided for European model only g Screw pan M3x6 h i and j Taptite cup B M3x10 For the MFC4820C For the MFC4420C ...

Page 106: ...in Driver flat cable 1 Driver flat cable 2 Driver PCB Power supply harness power driver red Driver flat cable 1 Driver flat cable 2 CIS travel motor harness PF air pump motors harness ASF CR purge motors harness Reassembling Notes For routing of the harnesses refer to Routing A B C and D in Section 6 1 15 Routing of the Harnesses and Flat Cables After replacing the driver PCB be sure to follow ste...

Page 107: ...ode 66 Set the CIS scanner area Function code 55 Check the sensor operation Function code 32 Check the operation of the control panel PCB Function code 13 Check the LCD operation Function code 12 Turn the machine off and then back on Exit the machine from maintenance mode to restore it to the standby state Press the 9 key twice in the initial stage of the maintenance mode to restore the machine to...

Page 108: ...scanner glass from getting scratched or damaged 1 Return the machine to the original position NOTE When placing a machine from which the bottom plate has been removed put an appropriate pad about A4 sized under the machine to prevent the flat cables and harnesses from getting crushed 2 Turn the document cover upright and lift it up and off Hinge Document cover Hinge Scanner unit Pad Scanner glass ...

Page 109: ...each of the right and left stopper links then lift up the scanner unit and pull the CIS flat cable CIS travel motor harness and panel main harness out of the machine CIS flat cable Stopper link Upper cover Taptite cup B M3x10 Stopper link Panel main harness CIS travel motor harness Scanner unit This core is provided European model only ...

Page 110: ...nly Disassembly of the control panel ASSY 5 Remove the seven screws from the control panel PCB 6 Turn the scanner open sensor actuator and remove it from the control panel 7 Remove the screw from the LED board support and separate the LED board and diffusion film from the LCD 8 Unlock the LCD connector on the control panel PCB and disconnect the LCD flat cable Not provided on the MFC4420C Control ...

Page 111: ...h on the inside right of the lower cover warp the lower cover outwards and then lift up the front end of the upper cover 3 Remove the ASF cover R Stopper link Upper cover Stopper link The stopper spring L should be hooked onto the stopper link ASF cover R Lower cover Latch Taptite bind M4x12 Stopper spring L Stopper spring L Stopper spring R U shaped opening ...

Page 112: ...ush down the upper cover and press it towards the rear Take care not to pinch any harnesses between the upper and lower covers Make sure that the top ends of the stopper springs R and L are fitted into their stopper links as illustrated on the previous page If you push the upper cover down straight the stopper springs R and L will be under the upper cover and will not work correctly When setting t...

Page 113: ... the media module and take the media module out of the machine while lightly pulling section X to the front 2 MFC4820C Lift up the handset mount MFC4420C Lift up the side cover For the MFC4820C For the MFC4420C Reassembling Notes The hook switch harness is secured to the inside face of the handset mount with adhesive tape as shown in Routing F in Section 6 1 15 Routing of the Harnesses and Flat Ca...

Page 114: ...6 29 6 1 11 Speaker 1 Pull the speaker and its spring out of the lower cover ...

Page 115: ...ly lift up the rear end of the ASF unhook the four latches and remove the two bosses from the engine unit and then lift the ASF up and out of the machine 6 Disconnect the ASF motor harness from the ASF motor located at the right end of the ASF 7 Disconnect the sensor harness ASF main and purge cam HP switch harness from the sensor PCB located on the ASF Then the ASF can now be completely separated...

Page 116: ...haft out to the right The ASF roller ASSY will come off 13 Remove two screws d from the paper tray base and pull it up and to the rear 14 Warp the center of the lower chute and disengage the locking tabs on both ends of the lower chute from the ASF frame 15 Remove four screws e from the center base flap ASSY Lightly push the ASSY up from the bottom and release the two hooks on the rear end of the ...

Page 117: ...oove provided in the ASF frame as shown on the previous page Take care with the direction of the sensor harness ASF main Join the connector housing that is farther from the ferrite core to the sensor PCB See the illustration on page 6 30 Before securing the ASF loosen four shoulder screws g and two grounding screws h on the engine unit see page 6 34 This is to make the ASF and engine unit parallel...

Page 118: ...o h screws from the engine unit 3 Disconnect the harnesses from the carriage motor purge motor air pump motor and paper feed motor 4 Remove two screws i from each of the needle sections of the needle tube head flat cable ASSY 5 Take out each of ink tubes that are routed between the tube guides on the ink cartridge support base 6 Lift the engine unit up and out of the lower cover NOTE When handling...

Page 119: ...or harness Ink cartridge support base Lower cover Ink absorber case Needle sections of the needle tube head flat cable ASSY i g g h Carriage motor harness brown Purge motor harness black Purge switch harness yellow Engine unit h Drain tube Bushings Waste ink tube g Shoulder screw 4x10 h Screw cup M3x5 i Taptite bind B M3x8 ...

Page 120: ... the left end of the paper feed roller and then take off the PF roller pulley 12 Remove the retaining ring from the left end of the paper ejection roller and then remove the paper ejection gear The PF timing belt 160 5 can be removed from the machine Engine unit Paper feed motor Retaining ring Retaining ring PF roller pulley j PF timing belt 135 PF encoder disk k PF encoder flat cable PF encoder s...

Page 121: ...n screw from the top and two o screws from the side from the purge unit then remove the purge unit itself m Purge plate Purge foam m n Purge unit Purge switch harness Engine unit placed upside down Carriage motor Drain tube Rear Purge motor Purge unit Suction tube Engine unit Carriage motor Purge motor Drain tube m o o m Screw bind M2 6x4 n Screw pan s p washer M2 6x16 o Taptite bind B M2 6x5 ...

Page 122: ...to subject it to any excessive force as it warps easily once it is removed 17 Remove screw r that secures the encoder strip spring at the right end of the engine unit Then remove the encoder strip spring from the engine lower frame NOTE Take care not to scratch or damage the encoder strip If it becomes dirty wipe it with a soft dry cloth If it is stained with ink replace it with a new one Engine u...

Page 123: ...on which the property code is printed is attached to the head unit itself and the rear left side of the machine with the battery cover or rear cover S removed For the MFC4820C For the MFC4420C Refer to Section 6 1 4 If you remove the print head unit and store it separately from the machine remove the property label from the machine and store it together with the print head unit If you replace the ...

Page 124: ...rint head unit Black tube Cyan tube Head flat cables Routing the ink tubes and head flat cables Yellow tube Magenta tube Paper width sensor cover Print head unit Head cover Latches Head flat cable 2 Head flat cable Needle tube ASSY Carriage rail Head clamp spring CR encoder sensor Paper width sensor ...

Page 125: ...After turning the machine to the normal position pull up the top edge of the wiper with tweezers or similar taking care not to damage it Planet unit Head wiper Gear 4 Cap cam For the installation procedure of the print head unit refer to page 6 10 After it has been removed once the print head unit will require adjustments after it is reinstalled For details refer to Section 6 1 2 Adjusting the pri...

Page 126: ... absorber case and take it out of the lower cover NOTE Do not remove the ink absorber case unless it needs to be replaced When replacing it set a new one immediately to prevent the machine from getting stained with drained ink NOTE If the ink absorber case or its surroundings are stained with ink wipe it off with a cloth Ink absorber case Ink cartridge sensor harness Ink cartridge support base Tap...

Page 127: ...nk cartridge support base NOTE Removing the air tube joined to the module will render it unusable and a new tube will have to be put back in Ink cartridge support base Harness guide Ink cartridge support base placed upside down Harness guide Boss Rear Ink cartridge sensor harness Cover spring Ink slot cover Air tube blue Rubber bushing Air pump motor module Ink cartridge sensor PCB Routing the ink...

Page 128: ...th the new module to the rear left side of the machine If the module is replaced with a new one you will need to update the property data stored in the EEPROM on the driver PCB Make the machine enter the maintenance mode Function code 68 0789 and enter the 19 digits of the property code of the newly installed module For details refer to Chapter 7 Section 7 5 15 Property code 19 digit Lower cover R...

Page 129: ...S travel motor harness white 4 pin Sensor harness ASF main white 5 pin Panel main harness red 6 pin Speaker harness red black 2 pin NCU main harness white 12 pin CL main harness white 11 pin Power supply harness power main black 6 pin Power supply harness power driver white 5 pin Lower cover placed upside down Boss Adhesive tape Boss on which the NCU main harness should be hooked USB PCB Main PCB ...

Page 130: ...2 Media flat cable 1 Aluminum evaporated film EMC spring plate PF encoder flat cable CIS flat cable Driver flat cable 2 Driver flat cable 1 Lower cover placed upside down Driver PCB NCU PCB Front Power supply PCB Flat core Main PCB Routing C Harnesses on the bottom of the lower cover with the enclosure cover removed together with the NCU PCB and power supply PCB ...

Page 131: ... PCB on the ASF ASF switch harness Harness guides Purge motor Carriage motor leads Carriage motor leads Purge motor leads Carriage motor Right ASF motor leads ASF motor ASF CR purge motors harness ASF cover R ASF switch Viewed from the right ASF switch harness Purge motor leads Harness guides Sensor harness ASF main Purge switch harness Purge motor leads black Carriage motor leads brown ASF motor ...

Page 132: ...tor Engine unit PF motor leads Air pump motor leads PF air pump motors harness Purge switch harness yellow Purge motor Speaker Carriage motor Speaker harness ASF motor leads white Purge motor leads black Carriage motor leads brown ASF CR purge motors harness Rear 1442443 Lower cover ...

Page 133: ...motor harness Air pump motor Adhesive tape Hook switch harness Head flat cables Ink cartridge sensor harness Cable guide Hook Ink cartridge support base Yellow tube Magenta tube Purge unit Slit provided in the ink absorber felts Engine unit Black tube Drain tube Not provided on the MFC4420C ...

Page 134: ...nter the maintenance mode by pressing Menu Set 2 8 6 and 4 keys in this sequence 4 Pull the release lever towards you and open the scanner unit Turn the scanner open sensor actuator on the underside of the scanner unit towards you and keep it depressed with adhesive tape This prevents the machine from detecting that the cover is open 5 Open the ink slot cover NOTE Be sure to perform steps 4 and 5 ...

Page 135: ...G ALL appears on the LCD press the 0 key 10 When C REFILL ALL appears press the Fax Start key The machine displays CLEANING PLEASE WAIT and starts a cyan substitute purge 11 When the purge is completed the machine returns to the initial stage of the maintenance mode Press the 9 key twice to exit the maintenance mode 12 Unplug the AC power cord from the wall socket 13 Remove the adhesive tape that ...

Page 136: ...CHAPTER 7 MAINTENANCE MODE ...

Page 137: ...ng Start End Position Function code 54 7 19 7 5 10 Acquisition of White Level Data and CIS Scanner Area Setting Function code 55 7 20 7 5 11 Output of Scanning Clock Function code 59 7 20 7 5 12 Carriage Travel and Initial Setup Mode Function code 63 7 21 7 5 13 Alignment of Vertical Print Lines in Monochrome and in Two Colors and Adjustment of Head Skew Function code 65 7 22 7 5 14 Margin Adjustm...

Page 138: ... record telephone calls Erase Lets you delete voice messages all fax messages or all messages Speaker Phone Lets you dial telephone and fax numbers and speak to another party without lifting the handset Hold Lets you place calls on hold Redial Pause Redials the last number you called It also inserts a pause in auto dial numbers Displays messages on the screen to help you to set up and use your mac...

Page 139: ...on when you send a fax Search Speed dial Lets you look up numbers that are stored in the dialing memory It also lets you dial stored numbers by pressing and a two digit number Volume When using the speaker or listening to the ring you can press this key to adjust the volume Menu Set Lets you access the Menu to program and store your settings in the machine Press to scroll forward or backward to a ...

Page 140: ... mode functions listed in Section 7 3 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 7 5 NOTES Pressing the 9 key twice in the initial stage of the maintenance mode makes the equipment exit from the maintenance mode restoring it to the standby state Pressing the Stop Exit key after en...

Page 141: ... 20 59 Output of Scanning Clock 7 5 11 7 20 63 Carriage Travel and Initial Setup Mode 7 5 12 7 21 65 Alignment of Vertical Print Lines in Monochrome and in Two Colors and Adjustment of Head Skew 7 5 13 7 22 66 Margin Adjustment in Near edge Printing 7 5 14 7 24 68 Updating of Property Data 7 5 15 7 26 69 Initial Adjustment of PWM Value Aging of the carriage 7 5 16 7 27 74 EEPROM Customizing 7 5 17...

Page 142: ...lectors but you may allow them to access user accessible selectors which are shaded in the firmware switch tables in Appendix 4 The service personnel should instruct end users to follow the procedure given below 1 Press the Menu Set and Redial Pause keys in this order The LCD clears the current display NOTE The Redial Pause key is disabled during standby for redialing and timer 2 Press the 0 key 3...

Page 143: ...ration One touch dialing Speed dialing Group dialing All of these will be initialized These will not be initialized EEPROM customizing code 4 digit This will not be initialized Note that the first digit of the 4 digit code will be initialized to 0 If the code is 1001 for example it will be initialized to 0001 NOTE If you replace the driver PCB with one used for any other facsimile equipment carry ...

Page 144: ...canning compensation data list containing the following a Black white data graph b LED PWM data for color image 1 byte c LED PWM data for monochrome image 1 byte d LED light intensity pulse data for green image 2 bytes e LED light intensity pulse data for blue image 2 bytes f LED light intensity pulse data for red image 2 bytes g A D converter reference level for high value 1 byte h A D converter ...

Page 145: ...7 8 Scanning Compensation Data List ...

Page 146: ...ice personnel to check for print quality or alignment Operating Procedure Press the 0 and 9 keys in this order in the initial stage of the maintenance mode The figure below shows a test pattern which is printed on the PRINT QUALITY CHECK SHEET According to the instructions printed on the sheet you may check or correct the print quality and alignment Test Pattern ...

Page 147: ...3 PABX mode setting WSW04 TRANSFER facility setting WSW05 1st dial tone and busy tone detection WSW06 Pause key 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 REDIAL facility setti...

Page 148: ...t and left arrow keys to move the cursor to the selector position to be modified 4 Enter the desired number using the 0 and 1 keys 5 Press the Set key This operation saves the newly entered selector values onto the EEPROM and readies the equipment for accepting a firmware switch number 6 Repeat steps 2 through 5 until the modification for the desired firmware switches is completed 7 Press the Menu...

Page 149: ...e 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 equipment prints out the configuration list as shown in the figure below 3 Upon completion of printing the equipment returns to the initial stage of the maintenance mode Configuration List ...

Page 150: ...der in the initial stage of the maintenance mode The LCD shows the screen given at right 2 Press the Fax Start key Each time you press the Fax Start key the LCD cycles through the displays shown at right Fax Start key Fax Start key Fax Start key 3 Press the Stop Exit key in any process of the above display cycle The equipment beeps for one second and returns to the initial stage of the maintenance...

Page 151: ... decimal notation each time a key or button is pressed Check that the displayed number is correct by referring to the illustration below If a key or button is pressed out of order the equipment 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 Exit key 3 After the last number key or button is pressed the ...

Page 152: ...by pressing the Black Copy key The MFC4420C has no hook switch but the HK in the latter character string always appears Given below is the relationship between the LCD indication sensor name and sensor status LCD Sensors Sensing status CV Scanner ink slot cover open sensor Scanner unit closed RS Registration sensor No recording paper detected PW Paper width sensor No paper detected P1 Purge cam HP...

Page 153: ...paper through the registration sensor or paper width sensor or remove the ink cartridges and then check that the indication on the LCD changes according to the sensor states 3 To stop this operation and return the equipment to the initial stage of the maintenance mode press the Stop Exit key ...

Page 154: ...ER appears on the LCD 2 To check the number of received files press the 1 key The 1 NO OF JOBS appears on the LCD Press the Menu Set key and the number of received files appears just as NO OF JOBS 10 3 To transfer the activity report only press the 2 key The 2 ACTIVITY appears To transfer received files together with the activity report press the 3 key The 3 DOCUMENTS appears Note that if there is...

Page 155: ...e sender equipment Telephone number of the sender equipment Transfer start date End page sample FAX TRANSFER END PAGE JOB NO TOTAL PAGE S NAME FAX TEL 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 00 001 001 BROTHER 052 824 2330 052 824 2846 Total number of transfer op...

Page 156: ...o 5 mm 3 To increase the correction value press the left arrow key to decrease it press the right arrow key If you press the Stop Exit key the equipment returns to the initial stage of the maintenance mode without making change of the correction value 4 Press the Menu Set key The ACCEPTED appears on the LCD After one second the equipment returns to the initial stage of the maintenance mode 5 and 4...

Page 157: ...age of the maintenance mode The WHITE LEVEL1 will appear on the LCD The equipment automatically obtains white level data 2 If this operation completes normally the equipment returns to the initial stage of the maintenance mode If any error is noted the SCANNER ERROR appears on the LCD To return the equipment to the initial stage of the maintenance mode press the Stop Exit key 7 5 11 Output of Scan...

Page 158: ... completion of head replacement or adjustment jobs press the Stop Exit key The carriage will return to the home position where the print head unit will be locked 3 To enable or disable the initial setup mode when the power is applied at the next time press the 1 or 3 key respectively If you enable the initial setup mode wait until the INIT appears on the LCD and the print head unit becomes locked ...

Page 159: ...hrough 3 blocks Also a set of head skew check patterns 2 1200 through 2 1200 is printed The 600DPI NO 1 9 appears on the LCD 2 On the 1st sheet check the printed vertical alignment check patterns for 600 dpi in monochrome and find which number block shows full alignment If the block is other than 5 enter that block number by using the numerical keys The 1200DPI NO 1 9 appears on the LCD 3 For 1200...

Page 160: ...7 23 1st sheet 2nd sheet Vertical Alignment Check Patterns and Head Skew Check Pattern ...

Page 161: ...nd right margins on the printout If all margins are within the range from 1 8 to 2 2 mm no adjustment is required Example Top 2 3 mm Bottom 1 7 mm Left 1 8 mm Right 2 3 mm 5 If any of the margins is out of the specified range press the 6 key twice again The MEDIA SENSOR ADJ appears again 6 Press the key to make the equipment ready for data entry 7 Enter the measured value in units of 0 1 mm multip...

Page 162: ...7 25 Margin Check Patterns ...

Page 163: ...8 0 keys in this order For the paper feed roller press the 0 1 2 3 keys in this order For the paper ejection roller press the 0 4 5 6 keys in this order For the air pump motor module press the 0 7 8 9 keys in this order The current property data stored in the EEPROM appears on the LCD and the equipment is ready for entry 3 Check the property label that comes with a new spare part print head unit p...

Page 164: ...an error after completion of the aging Operating Procedure 1 Press the 6 and 9 keys in this order in the initial stage of the maintenance mode The equipment starts aging the carriage showing the CR AGING on the LCD After writing the initial value of the PWM onto the EEPROM and checking the head drive voltage level the equipment automatically returns to the initial stage of the maintenance mode If ...

Page 165: ...102 in the case of MF4820C U S A version appears 2 Enter the desired customizing code e g 0002 in the case of MFC4420C Canadian version NOTE To enter letters A through F press the 1 through 6 keys while holding down the key respectively The newly entered code appears NOTE If a wrong 4 digit code is entered the equipment will malfunction 3 Press the Fax Start key The equipment saves the setting and...

Page 166: ...1 min 20 sec 0 25 cc Press the 1 key Continuation suction Please do not perform Press the 2 key Wiping Please do not perform Press the 3 key Initial purge This purge is performed automatically when the power is first applied by the user after shipment It fills the ink supply tubes and print head unit with ink 2 5 to 4 0 min 3 21 cc Press the 4 key Reset purge This purge is performed to remove any ...

Page 167: ...ges have been printed 9 Purge count indicating how many times the purge operation has been carried out 2 10 Wiper count indicating how many times the wiper operation has been carried out 11 Ink cartridge change count indicating how many times ink cartridge replacement has been made for each color 1 12 Error code of the most recent machine error 3 13 Error code of the most recent communications err...

Page 168: ...e telephone line It allows the service personnel to receive the transmission log of the user s equipment at a remote location and use it for analyzing problems arising in the user s equipment Operating Procedure 1 If the user s equipment has a transmission related problem call the user s equipment at a remote location from your equipment 2 If the line is connected have the user perform the followi...

Page 169: ...ck mode so as not to exit from the mode NOTE Carrying out this procedure will lose passwords previously entered but retain FAX messages received in the Pin TX lock mode Operating Procedure 1 When the PIN TX LOCK is displayed on the LCD press the Menu Set and keys at the same time Within two seconds start to press the 2 7 9 0 and 0 keys The Pin TX lock mode will be canceled and the equipment return...

Page 170: ...CHAPTER 8 ERROR INDICATION AND TROUBLESHOOTING ...

Page 171: ... to Troubleshooting 8 13 8 2 4 Troubleshooting Procedures 8 15 1 Control panel related 8 15 2 Telephone related 8 15 3 Communications related 8 16 4 Paper feeding related 8 16 5 Print image related 8 17 6 PC driven printing 8 20 7 SmartMedia Compact Flash or Memory Stick driven printing 8 21 8 Others 8 21 Cleaning the purge unit 8 22 Cleaning the print head unit 8 22 8 3 JAMS 8 23 8 3 1 Paper is J...

Page 172: ...de and then press the 8 and 2 keys Following the MACHINE ERROR one of the error codes listed in 2 will appear on the LCD 1 Error messages on the LCD Messages on the LCD Probable Cause CHECK PAPER Reload paper then press FAX START These messages appear alternately The registration sensor detects no recording paper loaded in the auto sheet feeder ASF COVER OPEN PLS CLOSE COVER These messages appear ...

Page 173: ...ected with the host computer the equipment has received no response from the computer A communications error has occurred PLS OPEN COVER To display the relating detailed error code use maintenance mode function code 82 Refer to Chapter 7 Section 7 5 20 If this message appears open and close the scanner unit The message may disappear if opening closing the scanner unit removes the error If the erro...

Page 174: ...k ink has run out 27 The yellow ink has run out 28 The cyan ink has run out 29 The magenta ink has run out Ink cartridges Ink cartridge sensor PCB Needle tube head flat cable ASSY Main PCB 3 Carriage travel error Any obstacle to the travel of the carriage in the machine Recording paper jammed Carriage ASSY CR encoder strip Any stains or scratches Hooked correctly Carriage motor Main PCB Power supp...

Page 175: ...h does not go OFF even after the purge cam has been driven by the specified number of pulses 52 The purge cam HP switch does not detect the origin point Purge unit Engine lower frame Paper feed motor Main PCB 54 The air pump motor does not rotate 55 The air pump motor rotates abnormally This code may appear only in the maintenance mode Air pump motor module Driver PCB 60 61 62 63 Paper width senso...

Page 176: ...PCB A1 Scanner unit or ink slot cover opened Scanner open sensor actuator Ink slot cover open sensor actuator Control panel PCB A4 50 or more faulty of white level data CIS unit Driver PCB Main PCB AC Less than 50 faulty of white level data CIS unit Driver PCB Main PCB AF CIS positioning error CIS unit CIS flat cable Driver PCB Main PCB B1 Dark level offset data level error for scanning B2 Gain co...

Page 177: ... Main PCB E6 Write error in EEPROM Driver PCB E8 Data scanning error during transmission EA Document removed at phase B CIS unit Main PCB F3 F5 Internal software error Replace the main PCB if this error occurs frequently F6 PC interface error Interface cable Main PCB F7 Media module connection error Main PCB Media module F8 Backup battery not loaded correctly For the MFC4820C Reinsert the battery ...

Page 178: ...tions error occurs the facsimile equipment emits an audible alarm intermittent beeping for approximately 4 seconds displays the corresponding error message and prints out the transmission verification report if the equipment is in sending operation ...

Page 179: ...ected meaning that the telephone number was invalid 17 07 No response from the calling station in receiving Available in German versions only 2 Command reception Code 1 Code 2 Causes 20 01 Unable to detect a flag field 20 02 Carrier was OFF for 200 ms or longer 20 03 Abort detected 1 in succession for 7 bits or more 20 04 Overrun detected 20 05 A frame for 3 seconds or more received 20 06 CRC erro...

Page 180: ... color function 4 Instructions received from the remote terminal checking the NSC DTC NSS and DCS Code 1 Code 2 Causes 40 02 Illegal coding system requested 40 03 Illegal recording width requested 40 05 ECM requested although not allowed 40 06 Polled while not ready 40 07 No document to send when polled 40 10 Nation code or manufacturer code not coincident 40 17 Invalid resolution selected 40 20 I...

Page 181: ...ansmission of NSS and DCS Code 1 Code 2 Causes 50 01 Vertical resolution capability changed after compensation of background color 6 DCN reception Code 1 Code 2 Causes 74 DCN received 7 TCF transmission reception Code 1 Code 2 Causes 80 01 Fallback impossible ...

Page 182: ... during operation except receiving into memory A0 13 Decoding error continued on 500 lines A0 14 Decoding error continued for 10 seconds A0 15 Time out 5 seconds or more for one line transmission A0 16 RTC not found and carrier OFF signal detected for 6 seconds A0 17 RTC found but no command detected for 60 seconds A0 18 Receive buffer full during receiving into memory A0 19 No video data to be se...

Page 183: ...e the communication link is established BF 02 Transmission canceled with the Stop Exit key after the communication link is established 11 Maintenance mode Code 1 Code 2 Causes E0 01 Failed to detect 1300 Hz signal in burn in operation E0 02 Failed to detect PB signals in burn in operation 12 Equipment error Code 1 Code 2 Causes FF X X Equipment error For X X refer to Section 8 1 1 2 ...

Page 184: ...g continuity testing with a circuit tester 2 When disconnecting the connectors do not pull the lead wires but hold the connector housings 3 Before handling the PCBs touch a metal portion of the machine to discharge static electricity charged in your body When repairing the PCBs handle them with extra care After repairing the defective section be sure to check again if the repaired section works co...

Page 185: ...cables and harnesses are firmly connected 4 None of the fuses are blown Recording paper Check that 1 A recommended type of recording paper is used 2 The recording paper is not dampened Ink cartridges 1 Check that all of four ink cartridges are loaded Print head 1 Check that the print head is installed on the carriage correctly 2 Repeat the head purging operation several times 3 Clean the print sur...

Page 186: ...l panel PCB Main PCB 2 Telephone related Trouble Check 1 No phone call can be made Control panel PCB NCU PCB Main PCB 2 Speed dialing or one touch dialing will not work Ordinary dialing function other than the speed and one touch dialing If it works normally check the driver PCB if not refer to item 1 above 3 Dial does not switch between tone and pulse Main PCB 4 Telephone does not ring Speaker NC...

Page 187: ...is transmitted Main PCB NCU PCB 4 Paper feeding related Trouble Check 1 Recording paper not fed ASF and PF related gears Main PCB Driver PCB 2 Recording paper jam Paper feeding mechanism Check that the print head unit is installed to the carriage correctly ...

Page 188: ... PCB CIS unit At the printer Check the ink cartridges If any cartridges have run out of ink replace them Check the connection of the head flat cables on the main PCB and print head PCB Replace the needle tube head flat cable ASSY Replace the main PCB Clean the head caps and wiper of the purge unit with a Rubycel stick For the cleaning procedure refer to Cleaning the purge unit given on page 8 22 3...

Page 189: ...B At the printer side For each of the four ink colors perform the head purging operation several times to remove dust or air bubbles from its nozzles If the problem persists replace the print head unit Check the paper feed related rollers Replace the main PCB and power supply PCB 6 Black or blurred vertical stripes At the scanner Check the following components CIS unit Scanner glass At the printer...

Page 190: ... run out of ink or the ink viscosity has been increased replace it Replace the print head unit Replace the main PCB Replace the power supply PCB Check that the print head unit is installed to the carriage correctly 9 Random missing dots At the printer For each of the four ink colors perform the head purging operation several times to remove dust or air bubbles from its nozzles Check the ink cartri...

Page 191: ...lean the head caps and wiper of the purge unit with a Rubycel stick For the cleaning procedure refer to Cleaning the purge unit given on page 8 22 11 Stained leading edge of recording paper At the printer Clean the nozzle ends of the ink jet units Check that the print head unit is installed to the carriage correctly 6 PC driven printing Trouble Action to be taken 1 PC driven printing is impossible...

Page 192: ...sion JPG Media PCB Media flat cables Main PCB 2 More than one media card cannot be recognized The machine can recognize only a single media card at a time even if it has two cards in the two slots Only the first inserted one can be recognized If only a single media card is inserted refer to item 1 above 3 Media printing is impossible Check whether the memory is full 4 No Memory Stick can be recogn...

Page 193: ...d one for any other purge units NOTE During the cleaning jobs take care not to touch the head caps or wiper directly by hand or scratch their surfaces Do not remove them from the head cap holder Head cap unit Head wiper Rubycel stick Cleaning the print head unit 1 Remove the print head unit from the carriage Refer to Chapter 6 Sections 6 1 1 and 6 1 2 2 Soak a Rubycel stick in Glycerol cleaner 3 C...

Page 194: ...ammed inside the Machine 1 Open the scanner cover by releasing the scanner cover release lever and lifting the scanner cover Scanner cover release lever Scanner cover 2 Remove the jammed paper 3 Close the scanner cover Do not touch the ink tube because it can cause damage to the machine itself Ink tube ...

Page 195: ...Paper Tray 1 Push the lever as shown below and remove the jammed paper 8 3 3 Paper is Jammed inside the Paper Tray 1 Remove any paper from the paper tray that is not jammed Paper tray 2 Pull the paper tray out of the machine Paper tray ...

Page 196: ...8 25 3 Pull up the jammed paper to remove it Jammped paper 4 Reinstall the paper tray Paper tray ...

Page 197: ...MFC4820C MFC4420C Appendix 1 Serial No Descriptions ...

Page 198: ...per ejection roller This section gives coding information of those serial numbers and property codes 1 Serial number label for the machine itself Product item code Serial number 6 digit Production year Example 2002 2 2003 3 Production month January February March April May June A B C D E F G H J K L M July August September October November December Serial number Barcode Factory Location ...

Page 199: ...App 1 2 2 Property labels Property label for the print head unit Head skew rank 2D code Head property code 14 digits to be entered into the EEPROM Location Battery cover MFC4820C Rear cover S MFC4420C ...

Page 200: ...tor module 2D code Air pump property code Check sum Pump pressure set P0 Temperature code TS ID 1st line 2nd line Measuring device number 9 and 10 digits to be entered into the EEPROM RPM N4 Location Battery cover MFC4820C Rear cover S MFC4420C ...

Page 201: ...MFC4820C MFC4420C Appendix 2 Software Installation A2 1 Installing the Update Data to the Facsimile Machine App 2 1 A2 2 Setting ID Codes to Facsimile Machines App 2 6 ...

Page 202: ...ed off 2 Make sure that the power cord of the facsimile machine is unplugged from a wall socket 3 While holding down the 5 key on the control panel of the facsimile machine plug the power cord into a wall socket 4 Check to see that the following pattern appears on the LCD If it does not appear go back to step 2 above 5 Switch on your PC 6 Install the Downloader driver Usb_bootloader_W2K for Window...

Page 203: ...wnloader driver This procedure is not necessary if you have once downloaded the driver to your PC Click Next Select Search for a suitable driver for my device recommended and click Next Select Specify a location and click Next ...

Page 204: ...App 2 3 Select the folder where the Downloader driver is located then click OK Click Next Click Yes ...

Page 205: ...App 2 4 Click Finish to return to Windows ...

Page 206: ...on in the Filedrgs window NOTE Use the de compressed firmware file The compressed file is in auto de compression format so run the EXE file to de compress During downloading the machine sounds pip pip intermittently It will take approx 2 to 5 minutes to complete downloading Upon completion of the downloading the facsimile machine automatically reboots and returns to the standby state 3 Press the a...

Page 207: ...omputer before working ID codes are essential when more than one machine is connected to a single PC via USB Setting up the facsimile machine and your PC 1 Make sure that your PC is turned off 2 Make sure that the power cord of the facsimile machine is unplugged from a wall socket 3 While holding down the Menu Set key on the machine s control panel plug the power cord of the facsimile machine into...

Page 208: ... it will terminate The facsimile machine will automatically return to the standby mode 3 To check whether the entered character string ID code is correct make the machine enter the maintenance mode refer to Chapter 7 Section 7 2 and then press the 1 key twice Section 7 5 4 The facsimile machine will print out a Configuration List At the right top of the list SER BROXXXXXXXXX is printed 4 Check tha...

Page 209: ...MFC4820C MFC4420C Appendix 3 EEPROM Customizing Codes ...

Page 210: ...g 1102 in the case of MFC4820C U S A version appears 3 Enter the desired customizing code e g 0002 in the case of MFC4420C Canadian version NOTE To enter letters A through F press the 1 through 6 keys while holding down the key respectively The newly entered code appears NOTE If a wrong 4 digit code is entered the equipment will malfunction 4 Press the Fax Start key The equipment saves the setting...

Page 211: ...MFC4420C DCP4020C U S A 1102 1001 CANADA 0102 0002 GERMANY 0103 0003 U K 0104 0004 FRANCE 0105 0005 BELGIUM 0108 0008 NETHERLANDS 0109 0009 SWITZERLAND 0110 0010 AUSTRIA 0103 ITALY 0116 0016 ASIA 0004 GENERAL 0154 0054 PAN NORDIC 0157 0057 IBERIA 0115 0015 ...

Page 212: ...MFC4820C MFC4420C Appendix 4 Firmware Switches WSW ...

Page 213: ...ode setting App 4 23 WSW21 TAD setting 1 App 4 24 WSW22 ECM and copy resolution setting App 4 25 WSW23 Communications setting App 4 26 WSW24 TAD setting 2 App 4 27 WSW25 TAD setting 3 App 4 27 WSW26 Function setting 4 App 4 28 WSW27 Function setting 5 App 4 29 WSW28 Function setting 6 App 4 30 WSW29 Function setting 7 App 4 31 WSW30 Function setting 8 App 4 31 WSW31 Function setting 9 App 4 32 WSW...

Page 214: ...ng mode pulse DP or tone PB dialing 0 PB 1 DP 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 Selectors 3 and 4 Break time length in pulse dialing These selectors set the break time length in puls...

Page 215: ... 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 in 1 dB increments 0 0 dB 1 8 dB 0 0 dB 1 4 dB 0 0 dB 1 2 dB 0 0 dB 1 1 dB Selectors 1 through 4 Tone signal transmission time length and Min pause in tone dialing These selectors set the tone signal tra...

Page 216: ...6 and 7 are not applicable where no PABX is installed Selectors 1 and 5 CNG detection when sharing a modular wall socket with a telephone These selectors determine whether or not the equipment detects a CNG signal when a line is connected to a telephone sharing a modular wall socket with the equipment Upon detection of CNG signals by the number of cycles specified by these selectors the equipment ...

Page 217: ...Setting and Specifications 1 Earth function in transfer facility 0 Provided 1 Not provided 2 4 Not used 5 6 Earth time length for earth function No 5 6 0 0 200 ms 0 1 300 ms 1 0 500 ms 1 1 700 ms 7 8 Break time length for flash function No 7 8 0 0 80 ms 0 1 110 ms 1 0 250 ms 1 1 500 ms NOTE Selectors 1 and 5 through 8 are not applicable in those countries where no transfer facility is supported Se...

Page 218: ...ed to the PSTN Setting all of these selectors to 1 activates the dial tone detection function so that the equipment starts dialing upon detection of a dial tone when a line is connected However in those countries which support no dial tone detection function e g in the U S A setting these selectors to 1 makes the equipment start dialing after a WAIT of 3 5 seconds For the detecting conditions of t...

Page 219: ...t disconnect the line Setting selectors 5 and 6 to 0 and 1 respectively makes the equipment detect a busy tone only after dialing and disconnect the line Setting both of selectors 5 and 6 to 1 makes the equipment detect a busy tone before and after dialing and then disconnect the line Selector 7 Busy tone detection in automatic receiving mode This selector determines whether or not the equipment a...

Page 220: ...ling DP system 1 0 1 2nd dial tone detection 1 1 1 both in DP and push button PB dialing system 4 6 Detection of 2nd dial tone No 4 5 6 0 0 0 50 ms 0 0 1 210 ms 0 1 0 500 ms 0 1 1 800 ms 1 0 0 900 ms 1 0 1 1 5 sec 1 1 0 2 0 sec 1 1 1 2 5 sec 7 No of 2nd dial tone detection cycles 0 1 cycle 1 2 cycles 8 Allowable instantaneous interrupt during reception of 2nd dial tone 0 30 ms 1 50 ms NOTE Selecto...

Page 221: ... 3 5 seconds When these selectors are set to 1 1 1 If you press the Pause key the equipment will first wait for the 2nd dial tone to be sent via the communications line regardless of pulse dialing or tone dialing After that pressing the Pause key will cause the equipment to insert a WAIT of 3 5 seconds In those countries where no dial tone detection function is supported setting these selectors to...

Page 222: ...d e g U S A NOTE Selector 3 is not applicable to those models having no loop current detection function Selectors 1 and 2 Dial tone frequency band control These selectors set the frequency band for the 1st dial tone and 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 Selector 3 Line current detection This selector determin...

Page 223: ...m 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 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 equipment starts dialing This setting is effective only when selectors 1 through 3 of WSW05 are set to 1 1 1 Selec...

Page 224: ...he error correction mode ECM is a facsimile transmission manner in which the equipment divides a message into frames for transmission so that if any data error occurs on the transmission line the equipment retransmits only those frames containing the error data Selector 2 Use of non standard commands If this selector is set to 0 the equipment may use non standard commands the machine s native mode...

Page 225: ...o CML ON This selector sets the time length from when the equipment transmits the last dial digit until the CML relay comes on Selector 3 Time length from CML ON to CNG transmission This selector sets the time length until the equipment transmits a CNG after it turns on the CML relay Selector 4 Time length from CML ON to CED transmission This selector sets the time length until the equipment trans...

Page 226: ... 5 1 175 440 175 440 ms 6 1 100 1000 ms 17 660 ms 7 1 110 410 320 550 ms 8 ON OFF time length ranges for busy tone More than one setting allowed 1 100 660 100 660 ms NOTE WSW11 is not applicable in those countries where no busy tone detection is supported NOTE 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 Selectors 1 and 2 Busy ton...

Page 227: ...pan 7 8 Not used Selectors 1 through 4 Min detection period required for interpreting incoming calling signal CI as OFF Max detection period for incoming calling signal CI being OFF If the equipment detects the OFF state of a CI signal for the period 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 Selectors 5 and 6...

Page 228: ...ors according to the distance from the telephone switchboard to the facsimile equipment Selectors 3 and 4 Reception level These selectors set the optimum receive signal level Selectors 5 through 8 Modem attenuator These selectors are used to adjust the transmitting level attenuation of the modem when the reception level at the remote station is improper due to line loss This function applies for G...

Page 229: ...o 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 Selectors 1 through 4 Frequency band selection for incoming calling signal CI These selectors are used to select the frequency band of CI for activating the AUTO ANS facility In the French versions if the user sets the PBX to OFF from the c...

Page 230: ...nt redials by the number of times set by selectors 3 through 6 at intervals set by selectors 1 and 2 Selector 7 Redialing for no response sent from the called terminal This selector determines whether or not the equipment redials if no G3 command response comes from the called station after dialing within the time length set by selectors 7 and 8 of WSW09 Selector 8 CRP option If a command error oc...

Page 231: ...ble 1 Enable Selector 2 ITU T CCITT superfine recommendation If this selector is set to 1 the equipment communicates in ITU T CCITT recommended superfine mode 15 4 lines mm If it is set to 0 it communicates in native superfine mode Selector 8 Stop key pressed during reception If this selector is set to 1 pressing the Stop key can stop the current receiving operation The received data will be lost ...

Page 232: ...licable in Japan Selectors 1 and 2 Off hook alarm These selectors activate or deactivate the alarm function which sounds an alarm when the communication is completed with the handset being off the hook 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 the l...

Page 233: ... Selectors 2 and 3 Detection enabled time for CNG and no tone After the line is connected via the external telephone or by picking up the handset of the facsimile equipment the equipment can detect a CNG signal or no tone for the time length specified by these selectors The setting specified by these selectors becomes effective only when selector 8 of WSW20 is set to 1 Selector 6 Registration of s...

Page 234: ... selectors 1 through 3 the equipment attempts to establish the transmission link via the MODEM If the establishment fails the equipment automatically steps down to the next lowest speed and attempts to establish the transmission link again The equipment repeats this sequence while stepping down the transmission speed to the last choice specified by selectors 4 through 6 If the MODEM always falls b...

Page 235: ...ons error state select the signal specifications Setting selector 2 to 1 allows the equipment 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 while the 2100 Hz signal does Setting selector 3 to 1 allows the equipment to ignore a DIS signal sent from the called stati...

Page 236: ...ble to models equipped with the ICM recording function Selectors 1 and 5 Max detection period of no tone during recording of ICM If the equipment detects no tone for the period specified by these selectors during recording of ICM it stops recording and disconnects the line The no tone refers to none of tones exceeding the dBm level specified by selectors 1 through 3 of WSW33 Selector 8 Erasure of ...

Page 237: ... are applicable to the Chinese Taiwanese and Asian versions only Selector 3 Call Waiting Caller ID Setting this selector to 0 allows the user to decide whether or not to interrupt the current call when a new call comes in If Call Waiting Caller ID service is available in the area and the user subscribes to it he she can see information about his her incoming call on the LCD Selectors 5 through 8 A...

Page 238: ...t 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 Selectors 2 and 3 Allowable training error rate The called s...

Page 239: ...have an OGM facility the settings made by these selectors also apply to the length of time from CML ON up to the start of OGM 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 NOTE Selectors 5 thr...

Page 240: ...nd then starts dialing This enables the equipment to list the total number of pages in the header of the facsimile message 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 or via the built in telephone The equipment interprets a CNG as an effective signal if it detects the CNG by the number of cycles specified b...

Page 241: ...plicable only to the U S A versions Selector 2 Ringer OFF setting This selector determines whether or not the ringer can be set to OFF Selector 4 Detection of distinctive ringing pattern If this selector is set to 1 the equipment detects only the number of rings if it is set to 0 the equipment detects the number of rings and the ringing time length to compare the detected ringing pattern with the ...

Page 242: ...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 Selectors 1 through 6 Transmission level of DTMF high low band frequency signal These selectors are intended for the manufacturer who tests the equipment for the Standard Never access them ...

Page 243: ... Selector No Function Setting and Specifications 1 3 Dial tone busy tone detection level during recording of ICM No 1 2 3 0 0 0 38 0 dBm A 0 0 1 39 5 dBm B 0 1 0 41 0 dBm C 0 1 1 42 5 dBm D 1 0 0 44 0 dBm E 1 0 1 45 5 dBm F 1 1 0 47 0 dBm G 1 1 1 48 5 dBm H 4 8 Not used NOTE Selectors 1 through 3 are applicable to models equipped with an internal TAD Selectors 1 through 3 Dial tone busy tone detec...

Page 244: ...e 100 without reduction if it is set to 1 the equipment records it at 70 size Selector 5 Minimum ON and OFF duration of ringer signals effective in distinctive ringing The ringer pattern consists of short and long rings e g short short long rings This selector sets the minimum ON and OFF duration of ringer signals that are required for the equipment to interpret ringer signals as being ON or OFF T...

Page 245: ...7 8 Default contrast No 7 8 0 X Automatic 1 0 Super light 1 1 Super dark Selectors 5 and 6 Default resolution These selectors set the default resolution which applies when the equipment is turned on or completes a transaction Selectors 7 and 8 Default contrast These selectors set the default contrast which applies when the equipment is turned on or completes a transaction ...

Page 246: ... Selectors 1 through 3 Detection threshold level of no tone during recording of ICM If the tone level during recording of ICM is less than the threshold setting made by these selectors the tone is interpreted as no tone When the no tone state is kept for the period specified by selectors 1 through 5 of WSW21 the equipment disconnects the line Selectors 4 and 5 FAX receiving speed to be kept within...

Page 247: ...selectors are set to 1 1 the CNG detection will not be inhibited WSW35 Function setting 13 Selector No Function Setting and Specifications 1 4 Max detection period of dial tone busy tone during recording of ICM No 1 2 3 4 0 0 0 0 No detection 0 0 0 1 1 sec 0 0 1 0 2 sec 0 1 0 0 4 sec 1 1 1 1 15 sec 5 8 Not used NOTE Selectors 1 through 4 are applicable to models equipped with an internal TAD Selec...

Page 248: ...Partial page in ECM mode Selectors 6 through 8 Extension of incoming calling signal CI frequency band specified by selectors 1 through 4 of WSW14 At the start of reception if the equipment detects the frequency of a CI signal specified by selectors 1 through 4 of WSW14 it starts the ringer sounding However the equipment may fail to detect the CI signal normally due to noise superimposed at the tim...

Page 249: ...ment will be printed out onto the error report if the document image data stored in the temporary memory cannot be transmitted normally 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 set to 1 the temporary memory will be occupied with image data Sett...

Page 250: ...G coding Setting this selector to 0 disables the equipment from sending receiving JPEG color images and from receiving JPEG monochrome images WSW44 Speeding up scanning 1 Selector No Function Setting and Specifications 1 5 Not used 6 8 Effective time length of the white level compensation data obtained beforehand No 6 7 8 0 0 0 Obtained compensation data ineffective 0 0 1 1 min 0 1 0 3 min 0 1 1 5...

Page 251: ...ng pseudo ringing of a connected external telephone Selector 1 Handling paper at the occurrence of a paper feed timing error When feeding paper to the print start position the equipment might cause a feed timing error so that the registration sensor goes ON signaling the presence of paper This selector determines whether the equipment will print on the current paper or eject the current paper with...

Page 252: ...App 4 40 WSW48 to WSW50 Selector No Function Setting and Specifications 1 8 Not used ...

Page 253: ...MFC4820C MFC4420C Appendix 5 Re Packing Instructions ...

Page 254: ...App 5 1 RE PACKING INSTRUCTIONS WARNING Do NOT unplug the machine after a print job until you hear the final click 1 Wrap the machine in the plastic bag ...

Page 255: ...App 5 2 2 Place the machine in the original box with the original packaging material ...

Page 256: ...MFC4820C MFC4420C Appendix 6 Wiring Diagram ...

Page 257: ...D 24 VDD2 23 VDD2 22 VDD2 21 VSS2 20 CLK2 19 VSS2 18 STB2 17 VREF2 16 FIRE31 15 FIRE32 14 FIRE30 13 FIRE35 12 FIRE34 11 FIRE36 10 FIRE26 9 FIRE24 8 FIRE25 7 FIRE22 6 FIRE20 5 FIRE21 4 VTEMP 3 M_LED 2 M_VDD 1 M_OUT CN2 POWER 5 S0V 4 30V 3 30V 2 P0V 1 P0V SWITCHING POWER SUPPLY 3 3V 5V 30V HVDD CN4 LCD_BL 2 BACKLIGHT 1 30V LCD CN3 LCD 6 VDD 5 VSS 4 VREF 3 STB 2 SCK 1 DATA BACKLIGHT PCB PANEL_L PCB C...

Page 258: ...MFC4820C MFC4420C Appendix 7 Circuit Diagrams A Main PCB B Driver PCB C Network Control Unit NCU PCB D Control Panel PCB E Power Supply PCB Terms in circuit diagrams Ceramic capacitor Chemical capacitor ...

Page 259: ...A Main PCB 1 5 ...

Page 260: ...A Main PCB 2 5 ...

Page 261: ...A Main PCB 3 5 ...

Page 262: ...A Main PCB 4 5 ...

Page 263: ...A Main PCB 5 5 ...

Page 264: ...B Driver PCB ...

Page 265: ...C NCU PCB ...

Page 266: ...D Control Panel PCB ...

Page 267: ...E Power Supply PCB ...

Page 268: ...Feb 03 SM FAX016 8CA602 Printed in Japan ...

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Brother MFC-4820C, Service Manual

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