Brother DCP8025DN, DCP8025D, DCP8020, MFC8820DN, MFC8820D Service Manual

...

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SERVICE MANUAL

MODEL: MFC8420/8820D/8820DN

DCP8020/8025D/8025DN

Read this manual thoroughly before maintenance work. Keep this manual in a convenient place for quick and easy reference at all times.

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in writing from the publisher. Specifications are subject to change without notice.

Trademarks: The brother logo is a registered trademark of Brother Industries, Ltd. Apple, the Apple Logo, and Macintosh are trademarks, registered in the United States and

other countries, and TrueType is a trademark of Apple computer, Inc. Microsoft and MS-DOS are registered trademarks of Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the U.S. and other countries.

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MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

PREFACE

This publication is a Service Manual covering the specifications, construction, theory of operation, and maintenance of the Brother machine. It includes information required for field troubleshooting and repair--disassembly, reassembly, and lubrication--so that service personnel will be able to understand machine function, to rapidly repair the machine and order any necessary spare parts.

To perform appropriate maintenance so that the machine is always in best condition for the customer, the service personnel must adequately understand and apply this manual.

This manual is made up of six chapters and appendices.

CHAPTER 1: GENERAL

CHAPTER 2: INSTALLATION AND BASIC OPERATION

CHAPTER 3: THEORY OF OPERATION

CHAPTER 4: DISASSEMBLY AND RE-ASSEMBLY

CHAPTER 5: PERIODIC MAINTENANCE

CHAPTER 6: TROUBLESHOOTING

CHAPTER 7: MAINTENANCE MODE

APPENDIX 1: EEPROM CUSTOMIZING CODES

APPENDIX 2: INSTALLING THE UPDATE DATA

APPENDIX 3: FIRMWARE SWITCHS (WSW)

APPENDIX 4: CIRCUIT DIAGRAMS

Information in this manual is subject to change due to improvement or redesign of the product. All relevant information in such cases will be supplied in service information bulletins (Technical Information).

A thorough understanding of this printer, based on information in this service manual and service information bulletins, is required for maintaining its print quality performance and for improving the practical ability to find the cause of problems.

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TABLE OF CONTENTS

REGULATION............................................................................................ viii

SAFETY INFORMATION.............................................................................. x

CHAPTER 1 GENERAL...........................................................................1-1

1. OVERVIEW ............................................................................................................ 1-1

2. SPECIFICATIONS.................................................................................................. 1-3

2.1 General.............................................................................................................................1-3

2.2 General (Continued).........................................................................................................1-3

2.3 Print Media .......................................................................................................................1-4

2.4 Copy.................................................................................................................................1-4

2.5 Fax....................................................................................................................................1-5

2.6 Scanner............................................................................................................................1-6

2.7 Printer...............................................................................................................................1-6

2.8 Interfaces..........................................................................................................................1-7

2.9 Consumable Items ...........................................................................................................1-7

2.10 Network (LAN) Board (NC-9100h) ...................................................................................1-7

2.11 Computer Requirements ..................................................................................................1-8

2.12 Paper................................................................................................................................1-9

2.12.1 Type and size of paper........................................................................................................1-9

2.12.2 Recommended paper..........................................................................................................1-9

2.12.3 Paper capacity of the paper trays........................................................................................1-9

2.12.4 Paper specifications for each paper tray..........................................................................1-10

2.13 Printable Area.................................................................................................................1-11

2.13.1 PCL5e/EPSON/IBM emulation .......................................................................................... 1-11

2.13.2 PCL6/BR-Script3 emulation..............................................................................................1-14

2.14 Print Speeds with Various Settings ................................................................................1-15

2.15 Toner Cartridge Weight Information...............................................................................1-15

3. SERIAL NO. DESCRIPTIONS.............................................................................. 1-16

CHAPTER 2 INSTALLATION AND BASIC OPERATION....................... 2-1

1. CONDITIONS REQUIRED FOR INSTALLATION................................................... 2-1

1.1 Power Supply....................................................................................................................2-1

1.2 Environment .....................................................................................................................2-1

2. UNPACKING........................................................................................................... 2-2

3. INSTALL THE MACHINE........................................................................................ 2-3

3.1 For All Users.....................................................................................................................2-3

3.1.1 Install the Automatic Document Feed (ADF) support..........................................................2-4

3.1.2 Install the drum unit assembly.............................................................................................2-5

3.1.3 Load paper into the paper tray............................................................................................2-6

3.1.4 Release the scanner lock....................................................................................................2-7

3.2 Installing the Driver & Software ........................................................................................2-8

3.2.1 For USB Interface Cable Users (For Windows® 98/98SE/Me/2000 Professional/XP)........2-8

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MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

3.2.2 For Parallel Interface Cable Users (For Windows

3.2.3 For Windows NT

95/98/98SE/Me/2000 Professional/XP)...................................................2-13

Workstation Version 4.0 Users............................................................2-18

3.2.4 For Network Interface Cable Users

(For Windows

3.2.5 For USB Interface Cable Users (For Mac

3.2.6 For USB Interface Cable Users (For Mac

3.2.7 For Network Interface Cable Users (For Mac

3.2.8 For Network Interface Cable Users (For Mac

95/98/98SE/Me/NT/2000 Professional/XP)..............................................2-20

OS 8.6 to 9.2 Users)......................................2-23

OS X 10.1/10.2.1 or greater Users)...............2-24

OS 8.6 to 9.2 Users)................................2-25

OS X 10.1/10.2.1 or greater Users).........2-26

CHAPTER 3 THEORY OF OPERATION................................................. 3-1

1. ELECTRONICS ...................................................................................................... 3-1

1.1 General Block Diagram ....................................................................................................3-1

1.2 Main PCB Block Diagram.................................................................................................3-2

1.3 Main PCB .........................................................................................................................3-3

1.3.1 CPU.....................................................................................................................................3-3

1.3.2 USB.....................................................................................................................................3-3

1.3.3 IEEE 1284...........................................................................................................................3-4

1.3.4 ROM....................................................................................................................................3-4

1.3.5 Flash ROM..........................................................................................................................3-5

1.3.6 SDRAM ...............................................................................................................................3-5

1.3.7 Optional RAM......................................................................................................................3-6

1.3.8 EEPROM.............................................................................................................................3-7

1.3.9 Reset circuit ........................................................................................................................3-7

1.3.10 Engine I/O ...........................................................................................................................3-7

1.3.11 Panel I/O .............................................................................................................................3-7

1.3.12 Video I/O .............................................................................................................................3-8

1.3.13 Scanner control ...................................................................................................................3-8

1.3.14 Power supply.......................................................................................................................3-9

1.4 Engine PCB....................................................................................................................3-10

1.5 Power Supply..................................................................................................................3-11

1.5.1 Low-voltage power supply.................................................................................................3-11

1.5.2 High-voltage power supply................................................................................................3-12

2. MECHANICS ........................................................................................................ 3-13

2.1 Overview of Printing Mechanism....................................................................................3-13

2.2 Scanner Mechanism.......................................................................................................3-14

2.3 Paper Transfer ...............................................................................................................3-15

2.3.1 Paper supply .....................................................................................................................3-15

2.3.2 Paper registration..............................................................................................................3-15

2.3.3 Paper eject........................................................................................................................3-16

2.3.4 Duplex printing ..................................................................................................................3-16

2.4 Sensors ..........................................................................................................................3-17

2.4.1 Cover sensors...................................................................................................................3-17

2.4.2 Toner sensors ...................................................................................................................3-17

2.4.3 Cassette sensor / Paper empty sensor.............................................................................3-18

2.4.4 Paper eject sensor............................................................................................................3-18

2.4.5 MP-PE sensor...................................................................................................................3-19

2.4.6 Document cover sensor....................................................................................................3-19

2.4.7 Document front sensor / Document rear sensor...............................................................3-20

2.4.8 DX-sensor PCB ASSY.......................................................................................................3-20

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TABLE OF CONTENTS

2.4.9 Rear cover sensor.............................................................................................................3-21

2.4.10 HP sensor.........................................................................................................................3-21

2.5 Drum Unit .......................................................................................................................3-22

2.5.1 Photosensitive drum..........................................................................................................3-22

2.5.2 Primary charger.................................................................................................................3-22

2.5.3 Transfer roller....................................................................................................................3-22

2.5.4 Cleaner..............................................................................................................................3-22

2.6 Toner Cartridge ..............................................................................................................3-22

2.7 Print Process..................................................................................................................3-22

2.7.1 Charging............................................................................................................................3-22

2.7.2 Exposure stage .................................................................................................................3-23

2.7.3 Developing........................................................................................................................3-24

2.7.4 Transfer.............................................................................................................................3-24

2.7.5 Fixing stage.......................................................................................................................3-25

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY .............................. 4-1

1. SAFETY PRECAUTIONS....................................................................................... 4-1

2. DISASSEMBLY FLOW ........................................................................................... 4-2

3. DISASSEMBLY PROCEDURE............................................................................... 4-3

3.1 AC Cord............................................................................................................................4-3

3.2 Drum Unit .........................................................................................................................4-3

3.3 Paper Tray........................................................................................................................4-4

3.4 DX Feed ASSY (MFC-8820D/8820DN, DCP-8025D/8025DN only) ..............................4-14

3.5 Access Cover / Battery...................................................................................................4-17

3.6 Driver PCB Access Cover ..............................................................................................4-18

3.7 ADF Unit.........................................................................................................................4-19

3.8 Document Scanner.........................................................................................................4-28

3.9 Panel Unit.......................................................................................................................4-33

3.10 Rear Cover C (MFC-8420, DCP-8020 only)...................................................................4-36

3.11 Outer Chute (MFC-8420, DCP-8020 only) .....................................................................4-37

3.12 Rear Cover MP ASSY / Outer Chute MP ASSY

(MFC-8820D/8820DN, DCP-8025D/8025DN only)........................................................4-38

3.13 Rear Cover L/R...............................................................................................................4-39

3.14 Side Cover L/R ...............................................................................................................4-40

3.15 Joint Cover .....................................................................................................................4-41

3.16 Front Cover ASSY (MFC-8420, DCP-8020 only) ...........................................................4-45

3.17 MP Unit (MFC-8820D/8820DN, DCP-8025D/8025DN only) ..........................................4-46

3.18 Rear Cover Sensor.........................................................................................................4-51

3.19 NCU (MFC-8420/8820D/8820DN only)..........................................................................4-52

3.20 Fixing Unit.......................................................................................................................4-53

3.21 Laser Unit .......................................................................................................................4-62

3.22 Main PCB .......................................................................................................................4-64

3.23 Base Plate / LV Insulation Sheet....................................................................................4-66

3.24 DX-Sensor PCB ASSY (MFC-8820D/8820DN, DCP-8025D/8025DN only)...................4-67

3.25 Engine PCB....................................................................................................................4-68

3.26 High-voltage PS PCB ASSY...........................................................................................4-69

3.27 Low-voltage PS PCB ASSY............................................................................................4-70

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MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

3.28 Paper Feeder..................................................................................................................4-71

3.29 Frame L / Drive Unit .......................................................................................................7-78

3.30 Reversing Release Solenoid (MFC-8820D/8820DN, DCP-8025D/8025DN only)..........4-82

3.31 Thermistor ASSY............................................................................................................4-83

3.32 Fan Motor 60 Unit LV / Fan Motor 60 Unit......................................................................4-83

3.33 Frame R..........................................................................................................................4-84

SERVICE MANUAL

4. PACKING.............................................................................................................. 4-86

5. GUIDELINES FOR LEAD FREE SOLDER............................................................ 4-87

6. SCREW TORQUE LIST........................................................................................ 4-90

7. LUBRICATION...................................................................................................... 4-92

8. HARNESS ROUTING........................................................................................... 4-95

CHAPTER 5 PERIODIC MAINTENANCE............................................... 5-1

1. CONSUMABLE PARTS.......................................................................................... 5-1

1.1 Drum Unit .........................................................................................................................5-1

1.2 Toner Cartridge ................................................................................................................5-3

2. PERIODICAL REPLACEMENT PARTS.................................................................. 5-7

2.1 Fixing Unit.........................................................................................................................5-8

2.2 Paper Feeding Kit ...........................................................................................................5-12

3. PERIODICAL CLEANING..................................................................................... 5-14

3.1 Cleaning the Machine Exterior .......................................................................................5-14

3.2 Cleaning the Scanner.....................................................................................................5-14

3.3 Cleaning the Printer........................................................................................................5-15

3.4 Cleaning the Drum Unit ..................................................................................................5-16

3.5 Cleaning the Scanner Window.......................................................................................5-16

3.6 Cleaning the Electrical Terminals...................................................................................5-17

4. MTBF / MTTR....................................................................................................... 5-18

CHAPTER 6 TROUBLESHOOTING ....................................................... 6-1

1. INTRODUCTION .................................................................................................... 6-1

1.1 Initial Check......................................................................................................................6-1

1.2 Warnings for Maintenance Work......................................................................................6-2

1.3 Identify the Problem..........................................................................................................6-3

2. ERROR MESSAGE................................................................................................ 6-4

2.1 Error Message on the LCD...............................................................................................6-4

2.2 Error Codes Shown in the “MACHINE ERROR X

X” message........................................6-7

3. PAPER PROBLEMS............................................................................................. 6-11

3.1 Paper Loading Problems................................................................................................6-11

3.2 Original Jams..................................................................................................................6-12

3.2.1 Original is jammed in the top of the ADF unit....................................................................6-12

3.2.2 Original is jammed inside the ADF unit.............................................................................6-12

3.3 Paper Jams ....................................................................................................................6-13

3.3.1 Clearing jammed paper.....................................................................................................6 -13

3.3.2 Paper is jammed in the Duplex Tray (For MFC-8820D/8820DN, DCP-8025D/8025DN)..6-16

3.3.3 Causes & countermeasures..............................................................................................6-17

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TABLE OF CONTENTS

3.4 Paper Feeding Problems................................................................................................6-18

4. SOFTWARE SETTING PROBLEMS .................................................................... 6-20

5. MALFUNCTIONS.................................................................................................. 6-23

6. TROUBLESHOOTING OF THE CONTROL PANEL............................................. 6-28

7. TROUBLESHOOTING OF FAX FUNCTIONS ...................................................... 6-30

8. IMAGE DEFECTS................................................................................................. 6-34

8.1 Image Defect Examples.................................................................................................6-34

8.2 Diameter of Rollers.........................................................................................................6-34

8.3 Troubleshooting Image Defect.......................................................................................6-35

8.4 Location of Grounding Contacts.....................................................................................6-53

8.4.1 Drum unit...........................................................................................................................6-53

8.4.2 Machine body & Paper tray ..............................................................................................6-53

9. INCORRECT PRINTOUT ..................................................................................... 6-54

10. NETWORK PROBLEM......................................................................................... 6-56

10.1 Installation Problem........................................................................................................6-56

10.2 Intermittent Problem .......................................................................................................6-57

10.3 TCP/IP Troubleshooting.................................................................................................6-58

10.4 UNIX Troubleshooting....................................................................................................6-58

10.5 Windows

10.6 Windows

10.7 Windows

10.8 Windows

10.9 Brother Internet Print (TCP/IP) Troubleshooting ............................................................6-60

10.10 Windows

10.11 Novell Netware Troubleshooting ....................................................................................6-61

10.12 AppleTalk Troubleshooting.............................................................................................6-62

10.13 DLC/LLC Troubleshooting..............................................................................................6-62

10.14 Web Browser Troubleshooting (TCP/IP)........................................................................6-62

10.15 Internet Fax Troubleshooting..........................................................................................6-63

NT/LAN Server (TCP/IP) Troubleshooting....................................................6-59

95/98/Me Peer to Peer Print (LPR) Troubleshooting ....................................6-59

95/98/Me Peer to Peer (HP JetAdmin Compatible Method) Troubleshooting........6-59

95/98/Me/NT 4.0/2000 Peer to Peer Print (NetBIOS) Troubleshooting........6-60

95/98/Me/2000/XP IPP Troubleshooting.......................................................6-60

CHAPTER 7 MAINTENANCE MODE...................................................... 7-1

1. ENTRY INTO THE MAINTENANCE MODE............................................................ 7-1

2. LIST OF MAINTENANCE–MODE FUNCTIONS..................................................... 7-2

3. DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS................... 7-4

3.1 EEPROM Parameter Initialization (Maintenance mode 01/91) ........................................7-4

3.2 Printout of Scanning Compensation Data (Maintenance mode 05).................................7-5

3.3 Placement of CCD Unit in Position for Transportation (Maintenance mode 06)..............7-7

3.4 ADF Performance Test (Maintenance mode 08) .............................................................7-7

3.5 Test Pattern 1 (Maintenance mode 09)............................................................................7-8

3.6 Firmware Switch Setting and Printout ..............................................................................7-9

3.6.1 Firmware switch setting (Maintenance mode 10)................................................................7-9

3.6.2 Printout of firmware switch data (Maintenance mode 11).................................................7-11

3.7 Operation Check of LCD (Maintenance mode 12).........................................................7-12

3.8 Operational Check of Control Panel PCB (Maintenance mode 13) ...............................7-13

3.9 Sensor Operational Check (Maintenance mode 32)......................................................7-14

3.10 Received Data Transfer Function (Maintenance mode 53)............................................7-16

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MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

3.11 Fine Adjustment of Scan Start/End Positions (Maintenance mode 54)..........................7-18

3.12 CCD Scanner Area Setting (Maintenance mode 55) .....................................................7-20

3.13 EEPROM Customizing (Maintenance mode 74)............................................................7-21

3.14 Printing out of Machine Log Information (Maintenance mode 77)..................................7-22

3.15 Display of the Equipment’s Log Information (Maintenance mode 80)............................7-24

3.16 Machine Error Code Indication (Maintenance mode 82)................................................7-26

3.17 Output of Transmission Log to the Telephone Line (Maintenance mode 87) ................7-26

3.18 Cancellation of the Memory Security Mode (Not applicable to the Japanese version) .7-27

SERVICE MANUAL

APPENDIX 1 EEPROM CUSTOMIZING CODES ...................................A-1

APPENDIX 2 INSTALLING THE UPDATE DATA....................................A-3

1. INSTALLING THE UPDATE DATA TO THE MACHINE..........................................A-3

1.1 Connecting the Machine to Your PC ................................................................................A-3

1.2 Setting up the Machine and Your PC ...............................................................................A-3

1.3 Installing the Update Data onto the Flash ROM of the Machine ......................................A-4

2. SETTING ID CODES TO MACHINES.....................................................................A-5

2.1 Connecting the Machine to Your PC ................................................................................A-5

2.2 Setting Up the Machine and Your PC...............................................................................A-5

2.3 Running the Setup Utility..................................................................................................A-6

APPENDIX 3 FIRMWARE SWITCHS (WSW) .........................................A-7

APPENDIX 4 CIRCUIT DIAGRAMS

4.1 Main PCB Circuit Diagram (1/6).....................................................................................A-50

4.2 Main PCB Circuit Diagram (2/6).....................................................................................A-51

4.3 Main PCB Circuit Diagram (3/6).....................................................................................A-52

4.4 Main PCB Circuit Diagram (4/6).....................................................................................A-53

4.5 Main PCB Circuit Diagram (5/6).....................................................................................A-54

4.6 Main PCB Circuit Diagram (6/6).....................................................................................A-55

4.7 Driver PCB Circuit Diagram ...........................................................................................A-56

4.8 Engine PCB Circuit Diagram (1/2)..................................................................................A-57

4.9 Engine PCB Circuit Diagram (2/2)..................................................................................A-58

4.10 NCU PCB Circuit Diagram (U.S.A.)................................................................................A-59

4.11 NCU PCB Circuit Diagram (Europe) ..............................................................................A-60

4.12 NCU PCB Circuit Diagram (Asia) ...................................................................................A-61

4.13 NCU PCB Circuit Diagram (Oceania).............................................................................A-62

4.14 Control Panel PCB Circuit Diagram................................................................................A-63

4.15 Low-voltage Power Supply PCB Circuit Diagram (200V) ...............................................A-64

4.16 Low-voltage Power Supply PCB Circuit Diagram (100V) ...............................................A-65

4.17 High-voltage Power Supply PCB Circuit Diagram (200V) ..............................................A-66

4.18 High-voltage Power Supply PCB Circuit Diagram (100V) ..............................................A-67

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REGULATION

LASER SAFETY (110 - 120V MODEL ONLY)

This printer is certified as a Class I laser product under the US Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. This means that the printer does not produce hazardous laser radiation.

Since radiation emitted inside the printer is completely confined within the protective housing and external covers. the laser beam cannot escape form the machine during any phase of user operation.

FDA REGULATIONS (110 - 120V MODEL ONLY)

The US Food and Drug Administration (FDA) has implemented regulations for laser products manufactured on and after August 2, 1976. Compliance is mandatory for products marketed in the United States. One of the following labels on the back of the printer indicates compliance with the FDA regulations and must be attached to laser products marketed in the United States.

The label for Japanese manufactured products

MANUFACTURED: K BROTHER INDUSTRIES, LTD.

15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. This product complies with FDA radiation performance standards, 21 CFR Subchapter J.

The label for Chinese manufactured products

MANUFACTURED: C BROTHER Corporation (Asia) Ltd. Shenzen Buji Nan Ling Factory

Gold Garden Ind., Nan Ling Village, Buji, Rong Gang, Shenzen, CHINA This product complies with FDA radiation performance standards, 21 CFR Subchapter J.

Caution

Use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure.

viii

Page 11

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

IEC 825 (220-240V MODEL ONLY)

This printer is a Class I laser product as defined in IEC 825 specifications. The label shown below is attached in countries where required.

CLASS 1LASERP RODUCT APPAREIL Å LASER DE CLASSE 1 LASER KLASSE 1 PRODUKT

This printer has a laser diode which emits invisible laser radiation in the Laser Unit. The Laser Unit should not be opened without disconnecting the two connectors connected with the AC power supply and laser unit. Since the variable resistor in the laser unit is adjusted in accordance with the standards, never touch it.

Caution

Use of controls, adjustments or performance of procedures other than those specified in this manual may result in hazardous radiation exposure.

For Finland and Sweden LUOKAN 1 LASERLAITE KLASS 1 LASER APPARAT

Varoitus! Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa altistaa käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle.

Varning – Om apparaten används på annat sätt än i denna Bruksanvisning specificerats, kan användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass

Page 12

SAFETY INFORMATION

CAUTION FOR LASER PRODUCT (WARNHINWEIS FUR LASER DRUCKER)

CAUTION: When the machine during servicing is operated with the cover open, the

CAUTION: In case of any trouble with the laser unit, replace the laser unit itself. To

ACHTUNG: Im Falle von Störungen der Lasereinheit muß diese ersetzt werden. Das

SAFETY INFORMATION

regulations of VBG 93 and the performance instructions for VBG 93 are valid.

prevent direct exposure to the laser beam, do not try to open the enclosure of the laser unit.

Gehäuse der Lasereinheit darf nicht geöffnet werden, da sonst Laserstrahlen austreten können.

ADDITIONAL INFORMATION

When servicing the optical system of the printer, be careful not to place a screwdriver or other reflective object in the path of the laser beam. Be sure to take off any personal accessories such as watches and rings before working on the printer. A reflected beam, though invisible, can permanently damage the eyes.

Since the beam is invisible, the following caution label is attached on the laser unit.

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MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

DEFINITIONS OF WARNINGS, CAUTIONS AND NOTES

The following conventions are used in this service manual:

SERVICE MANUAL

WARNING

Indicates warnings that must be observed to prevent possible personal injury.

CAUTION:

Indicates cautions that must be observed to service the printer properly or prevent damage to the printer.

NOTE: Indicates notes and useful tips to remember when servicing the printer.

**Listed below are the various kinds of “WARNING” messages included in this manual.

WARNING

Always turn off the power switch and unplug the power cord from the power outlet before accessing any parts inside the printer.

WARNING

Some parts inside the printer are extremely hot immediately after the printer is used. When opening the front cover or back cover to access any parts inside the printer, never touch the shaded parts shown in the following figures.

WARNING

If you analyze malfunctions with the power plug inserted into the power outlet, special caution should be exercised even if the power switch is OFF because it is a single pole switch.

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CHAPTER 1 GENERAL

1. OVERVIEW

utomatic document feeder (ADF)

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

DF document support extension

Control panel

Face-down output tray support flap

Front cover release button

Manual feed tray (MFC-8420, DCP-8020) Multi-purpose tray (MP tray) (MFC-8820D/8820DN, DCP-8025D/8025DN)

Paper tray (Tray #1)

Fig. 1-1

DF document output support flap

Document cover

Power switch

Front cover

DF cover

Face-up output tray (Back output tray)

Duplex tray (MFC-8820D/8820DN, DCP-8025D/8025DN)

C power connector

Paper adjustment lever for duplex printing (MFC-8820D/8820DN, DCP-8025D/8025DN)

External telephone line jack

Fig. 1-2

1-1

Parallel interface connec tor

Telephone line jack

USB interface connector

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CHAPTER 1 GENERAL

Document cover

Scanner lock lever

Glass strip

Document guidelines

White film

Scanner glass

Fig. 1-3

1-2

Page 16

2. SPECIFICATIONS

2.1 General

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Memory Capacity Optional Memory Automatic Document Paper Tray Multi-Purpose Tray

Manual Feed Tray Printer Type Print Method LCD

(Liquid Crystal Display)

Warm-up Power Source Power Consumption

32 MB 1 DIMM slot; Memory expandable up to 160 MB Up to 50 pages 250 Sheets (20 lb) 50 Sheets (20 lb) (MFC-8820D/8820DN, DCP-8025D/8025DN

only) Single sheet (20 lb) (MFC-8420, DCP-8020 only) Laser Electrophotography by semiconductor laser beam scanning 22 characters x 5 lines

Max. 18 seconds at 73.4°F (23°C) 120V AC 50/60Hz (U.S.A., CANADA Version only) Average Operating (Copying): 440 W or less (25°C)

Peak: 1090 W or less Sleep: 14 W or less Standby: 75 W or less (25°C)

Dimensions

Weight

Noise

2.2 General (Continued)

Temperature

Humidity

21.28 x 17.76 x 18.76 (in.) 532 x 444 x 469 (mm)

Without Drum/Toner Unit:

MFC-8420, DCP-8020: 36.6 lb/16.6 kg MFC-8820D/8820DN, DCP-8025D/8025DN: 39.9 lb/18.1 kg

Operating: 53 dB A or less Standby: 30 dB A or less

Operating: 50 - 90.5°F (10 - 32.5°C) Storage: 32 - 104°F (0 - 40°C)

Storage: 20 to 80% (without condensation) Operating: 10 to 90% (without condensation)

1-3

Page 17

CHAPTER 1 GENERAL

2.3 Print Media

Paper Input

• Paper type: Plain paper, recycled paper and transparencies, envelopes

(Manual Feed/Multi-purpose Tray)

• Paper size: A4, Letter, Legal, B5 (ISO), B5 (JIS), Executive, A5, A6,

B6 (ISO)

Weight: 16 - 28 lb (60 - 105 g/m

) (Paper Tray)

For more details, see Paper specifications for each paper

tray on page 1-10.

• Maximum paper tray capacity:

Approx. 250 sheets of 20 lb (80 g/m

) plain paper

• Maximum multi-purpose tray capacity:

Approx. 50 sheets of 20 lb (80 g/m

) plain paper

(MFC-8820D/8820DN, DCP-8025D/8025DN only)

< Manual Feed Tray/Multi-Purpose Tray >

• Paper size:

Width: 20 lb 2.75 - 8.66" (69.8 - 220.0 mm) Height: 4.60 - 16.00" (116.0 - 406.4 mm)

Weight: 16 - 43 lb (60 - 161 g/m

)

Paper Output

2.4 Copy

Color/Monochrome Copy Speed Multiple Copies Enlarge/Reduce Resolution

Up to 150 sheets of plain paper (Face up print delivery to the output paper support)

Monochrome Up to 17 copies/minute (Letter paper) Stacks or Sorts up to 99 pages 25% to 400% (in increments of 1%) Max. 1200 x 600 dpi

1-4

Page 18

2.5 Fax

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Compatibility Coding System Modem Speed

Original Size

Scanning Width Printing Width Gray Scale Polling Types Contrast Control Resolution

ITU-T Group 3 MH/MR/MMR/JBIG 33600-2400 bps

Automatic Fallback ADF Width: 5.8" to 8.5" (148 mm to 216 mm)

ADF Height: 5.8" to 14.0" (148 mm to 356 mm) Scanner Width: Max. 8.48" (212 mm) Scanner Height: Max. 14.0" (356 mm)

8.2 inches (208 mm)

64 levels Standard, Sequential Automatic/Light/Dark (manual setting)

• Horizontal 203 dot/inch (8 dot/mm)

• Vertical

• Standard 98 line/inch (3.85 line/mm)

• Fine, Photo 196 line/inch (7.7 line/mm)

• Superfine 392 line/inch (15.4 line/mm)

One-Touch Dial Speed-Dial Automatic Redial Auto Answer Communication

Source Memory Transmission Out of Paper

Reception

40 (20 x 2) 300 stations One time 0, 1, 2, 3 or 4 rings Public switched telephone network.

Up to 600/500 pages Up to 600/500 pages

1-5

Page 19

CHAPTER 1 GENERAL

2.6 Scanner

Color/Monochrome TWAIN Compliant

WIA Compliant Resolution

Document Size

Scanning Width Gray Scale Scanning Speed

Color/Monochrome

Yes (Windows

Workstation Version 4.0)

NT Yes (Windows

95/98/98SE/Me/2000 Professional and Windows

XP)

Up to 9,600 x 9,600 dpi (interpolated)* Up to 600 x 2,400 dpi (optical)

* Maximum 1200 x 1200 dpi scanning with Windows

XP (resolution up to 9600 x 9600 dpi can be selected by using the Brother scanner utility)

ADF Width: 5.8" to 8.5" (148 mm to 216 mm) ADF Height: 5.8" to 14.0" (148 mm to 356 mm) Scanner Glass Width: Max. 8.5" (216 mm) Scanner Glass Height: Max. 14.0" (356 mm)

8.35 inches (212 mm) 256 levels Color: 1.80 msec/line (Up to 300 x 300 dpi)

: 3.60 msec/line (400 x 400 dpi or higher)

Monochrome: 0.84 msec/line (ADF)

: 1.01 msec/line (Scanner Glass)

NOTE:

• Scanning directly to a networked PC is available with Windows Professional and XP.

• OS X scanning is supported in OS X 10.2.1 or greater.

2.7 Printer

Emulation

Printer Driver

Resolution Print Quality

Print Speed

Duplex Printing

98/98SE/Me/2000

PCL6 (Brother Printing System for Windows HP LaserJet) and BR-Script (PostScript

Windows

95/98/98SE/Me/2000 Professional/XP and Windows

Workstation Version 4.0 driver supporting Brother Native

emulation mode of

) Level 3

Compression mode and bi-directional capability

Apple

Macintosh® Quick Draw® Driver and PostScript (PPD) for

OS 8.6-9.2/OS X 10.1/10.2.1 or Greater HQ1200 (Max. 2400 x 600 dots/inch) Normal printing mode

Economy printing mode (saves toner usage) Up to 17 pages/minute letter size

(when loading paper from paper tray) Up to 8.5 images/minute: (MFC-8820D/8820DN,

DCP-8025D/8025DN only)

First Print

Up to 12 seconds (using letter size paper in paper tray)

1-6

Page 20

2.8 Interfaces

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Interface Parallel

USB

NOTE:

• Please make sure that you use a Hi-Speed USB 2.0 certified cable if your computer uses a Hi-Speed USB 2.0 interface.

• Even if your computer has a USB 1.1 interface you can connect the MFC.

• To meet FCC/CISPR emission requirements for the MFC, you must attach the included

filter core and cable tie to the parallel interface cable.

2.9 Consumable Items

Toner Cartridge Life Expectancy

Drum Unit Life Expectancy

Recommended Cable A bi-directional shielded parallel cable that is IEEE 1284 compliant

and not longer than 6 feet (2 m). A Hi-Speed USB 2.0 cable that is not longer than 6 feet (2 m).

TN-530: Standard Toner Cartridge - Up to 3,300* pages TN-560: High Yield Toner Cartridge - Up to 6,500* pages *(when printing letter size or A4 paper at 5% print coverage)

NOTE: Toner life expectancy will vary depending upon the type of

average print job.

Up to 20,000 pages/drum unit (DR-500)

NOTE: There are many factors that determine the actual drum life, such

as temperature, humidity, type of paper, toner you use and number of pages per print job.

2.10 Network (LAN) Board (NC-9100h)

MFC-8420/8820D (Option)

MFC-8820DN (Standard)

DCP-8020/8025D (Option)

When you add the optional Network (LAN) Board (NC-9100h), you can connect your MFC into the network to use the Internet FAX, Network Scanner, Network Printer and Network Management software operations for small workgroups.

NOTE:

SMTP/POP3 E-mail Services are required for Internet Fax.

Support for:

Windows

4.X, 5.X Mac OS 8.6 - 9.2, X 10.0-10.2.1 or Greater Ethernet 10/100 BASE-TX Auto Negotiation TCP/IP, IPX/SPX, AppleTalk, DLC/LLC RARP, BOOTP, DHCP, APIPA, NetBIOS, WINS LPR/LPD, Port9100, SMTP/POP3 SMB(NetBIOS/ IP), IPP, SSDP, Rendezvous, FTP MIBII as well as Brother private MIB TE LNET, SNMP, HTTP, TFTP

Included Utilities:

BRAdmin Professional and Web Based Management

NOTE:

• Scanning directly to a networked PC is not supported in Windows

• BRAdmin Professional is not supported in Mac OS.

95/98/Me/NT® 4.0/2000/XP Novell NetWare 3.X,

95, NT® and Mac OS.

1-7

Page 21

CHAPTER 1 GENERAL

2.11 Computer Requirements

Computer Platform & Operating

System Version

95, 98, 98SE

Windows® Operating System

Apple® Macintosh Operating System

NT® Workstation

4.0 2000

Professional XP OS 8.6 - 9.2

(Printing, Scanning and PC-FAX Send Only)

Mac OS X

10.1/10.2.1 or greater (Printing, Scanning PC-FAX Send and Remote Setup Only)

Minimum System Requirements Processor

Minimum Speed

Pentium 75MHz

Minimum RAM

24 MB 32 MB

Pentium 150MHz

32 MB 64 MB

Pentium 75MHz

Pentium 133MHz

64 MB 128 MB

Pentium 233MHz

32 MB 64 MB

All base models meet minimum

Requirements

128 MB 160 MB

Recommended RAM

Available Hard Disk Space

Driver

Application Software

100 MB

80 MB

180 MB

50 MB 200 MB

NOTE:

USB is not supported under Windows

95 or Windows NT® WS 4.0.

All registered trademarks referenced herein are the property of their respective companies.

For the latest drivers, go to the Brother Solutions Center at http://solutions.brother.com/

Application software is different for Windows® and Macintosh®.

Scanning is supported in 10.2.1 or greater.

1-8

Page 22

2.12 Paper

2.12.1 Type and size of paper

The machine loads paper from the installed paper tray, manual feed tray, multi-purpose tray or optional lower tray.

Tray type Model name Paper tray (Tray #1) MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

Manual feed tray MFC-8420, DCP-8020 Multi-purpose tray (MP tray) MFC-8820D/8820DN, DCP-8025D/8025DN Optional lower tray (Tray #2) Option for MFC-8420/8820D/8820DN,

2.12.2 Recommended paper

Plain Paper: Plain Paper: Xerox 4200DP 20 lb

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

DCP-8020/8025D/8025DN

Hammermill Laser Paper 24 lb Transparency: 3M CG 3300 Labels: Avery laser label # 5160

2.12.3 Paper capacity of the paper trays

Paper size Number of sheets Multi-purpose tray (MP tray)

(MFC-8820D/8820DN,

DCP-8025D/8025DN)

Manual feed tray (MFC-8420, DCP-8020)

Paper tray (Tray #1) A4, Letter, Legal, B5 (ISO),

Optional lower tray (Tray #2) A4, Letter, Legal, B5 (ISO),

Width: 69.8 to 220 mm (2.75 to 8.66 in.)

Height: 116 to 406.4 mm (4.57 to 16.0 in.)

Width: 69.8 to 220 mm (2.75 to 8.66 in.)

Height: 116 to 406.4 mm (4.57 to 16.0 in.)

B5 (JIS), Executive, A5, A6, B6 (ISO)

B5 (JIS), Executive, A5, B6 (ISO)

50 sheets (80 g/m

or 20 lb)

Single sheet

250 sheets (80 g/m

or 20 lb)

Duplex printing A4, Letter, Legal —

1-9

Page 23

CHAPTER 1 GENERAL

2.12.4 Paper specifications for each paper tray

Paper types

Paper weights

Model

MFC-8420 DCP-8020

MFC-8820D/8820DN DCP-8025D/8025DN

Plain paper, Bond paper,

Multi-purpose tray N/A

Recycled paper, Envelope Transparency

, Labels, and

Plain paper, Bond paper,

Manual feed tray

Recycled paper, Envelope, Labels, and

N/A

Transparency Paper tray Plain paper, Recycled paper, and Transparency*2 Optional lower tray Plain paper, Recycled paper, and Transparency Multi-purpose tray

N/A Manual feed tray 60 to 161 g/m2

(16 to 43 lb)

60 to 161 g/m2 (16 to 43 lb)

N/A

Paper tray 60 to 105 g/m2 (16 to 28 lb)

Optional lower tray 60 to 105 g/m Multi- purpose tray

(16 to 28 lb)

Width: 69.8 to 220 mm (2.75 to 8.66 in.)

N/A

Height: 116 to 406.4 mm (4.57 to 16.0 in.)

Manual feed tray Width: 69.8 to 220 mm

Paper sizes

Paper tray A4, Letter, Legal, B5 (ISO), B5 (JIS), Executive, A5,

Optional lower Tray A4, Letter, Legal, B5 (ISO), B5 (JIS), Executive, A5,

*1 Up to 3 envelopes *2 Up to 10 sheets

NOTE: Remove each transparency immediately.

(2.75 to 8.66 in.)

N/A

Height: 116 to 406.4 mm

(4.57 to 16.0 in.)

A6, B6 (ISO)

B6 (ISO)

1-10

Page 24

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

CAUTION:

When you are choosing print media, be sure to follow the information given below to prevent any paper jams, print quality problems or machine damage;

• It is recommended to use long-grained paper for the best print quality. If short-grained paper is being used, it might be the cause of paper jams.

• Use neutral paper. Do not use acid paper to avoid any damage to the drum unit.

• Avoid using coated paper such as vinyl coated paper.

• Avoid using preprinted or highly textured paper.

• It is recommended to use labels or transparencies which are designed for use in laser

printers.

• Avoid feeding labels with the carrier sheet exposed, or the machine will be damaged.

• Before loading paper with holes such as organizer sheets, be sure to fan the stack well.

• Do not use organizer sheets that are stuck together. The glue that is used might caused

damaged to the machine.

• When printing on the back of pre-printed paper, if the paper is curled, be sure to straighten the paper as much as possible.

• Different types of paper should not be loaded at the same time in the paper tray to avoid any paper jams or misfeeds.

2.13 Printable Area

2.13.1 PCL5e/EPSON/IBM emulation

The figure below shows the printable area each emulation guarantees when printing on Portrait and Landscape.

Portrait

Physical page Printable area

Logical page

B Physical page length D F

Maximum logical page length Distance from edge of physical page to

edge of logical page

C A

1-11

Page 25

CHAPTER 1 GENERAL

The table below shows the printable areas when printing on Portrait for each paper size.

Size A B C D E F G

Letter

Legal

Folio

Executive

A 4

A 5

A 6

B 5 (JIS)

B 5 (ISO)

B 6 (ISO)

COM10

MONARCH

C 5

NOTE:

• The paper sizes indicated here should confirm to the nominal dimensions specified by JIS except B5 (ISO).

• The dot size is based on 300 dpi resolution.

215.9 mm

8.5” (2,550 dots)

215.9 mm

8.5” (2,550 dots)

215.9 mm

8.5” (2,550 dots)

184.15 mm

7.25” (2,175 dots)

210.0 mm

8.27” (2,480 dots)

148.5 mm

5.85” (1,754 dots)

105.0 mm

4.13” (1,240 dots)

182.0 mm

7.1” (2,130 dots)

176.0 mm

6.93” (2,078 dots)

125.0 mm

4.92” (1,476 dots)

104.78 mm

4.125” (1,237 dots)

98.43 mm

3.875” (1,162 dots)

162.0 mm

6.38” (1,913 dots)

110.0 mm

4.33” (1,299 dots)

279.4 mm

11.0” (3,300 dots)

355.6 mm

14.0” (4,200 dots)

330.2mm

13.0” (3,900 dots)

266.7 mm

10.5” (3,150 dots)

297.0 mm

11.69” (3,507 dots)

210.0 mm

8.27” (2,480 dots)

148.5 mm

5.85” (1,754 dots)

257.0 mm

10.11” (3,033 dots)

250.0 mm

9.84” (2,952 dots)

176.0 mm

6.93” (2,078 dots)

241.3 mm

9.5” (2,850 dots)

190.5 mm

7.5” (2,250 dots)

229.0 mm

9.01” (2,704 dots)

220.0 mm

8.66” (2,598 dots)

203.2 mm

8.0” (2,400 dots)

203.2 mm

8.0” (2,400 dots)

203.2 mm

8.0” (2,400 dots)

175.7 mm

6.92” (2,025 dots)

198.0 mm

7.79” (2,338 dots)

136.5 mm

5.37” (1,612 dots)

93.0 mm

3.66” (1,098 dots)

170.0 mm

6.69” (2,007 dots)

164.0 mm

6.46” (1,936 dots)

164.0 mm

4.44” (1,334 dots)

92.11 mm

3.63” (1,087 dots)

85.7 mm

3.37” (1,012 dots)

150.0 mm

5.9” (1,771 dots)

98.0 mm

3.86” (1,157 dots)

279.4 mm

11.0” (3,300 dots)

355.6 mm

14.0” (4,200 dots)

330.2mm

13.0” (3,900 dots)

266.7 mm

10.5” (3,150 dots)

297.0 mm

11.69” (3,507 dots)

210.0 mm

8.27” (2,480 dots)

148.5 mm

5.85” (1,754 dots)

257.0 mm

10.11” (3,033 dots)

250.0 mm

9.84” (2,952 dots)

176.0 mm

6.93” (2.078 dots)

241.3 mm

9.5” (2,850 dots)

190.5 mm

7.5” (2,250 dots)

229.0 mm

9.01” (2,704 dots)

220.0 mm

8.66” (2,598 dots)

6.35 mm

0.25” (75 dots)

6.35 mm

0.25” (75 dots)

6.01 mm

0.24” (71 dots)

6.35 mm

0.25” (75 dots)

6.01 mm

0.24” (71 dots)

0 mm

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

1-12

Page 26

Landscape

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Physical page

Printable area

B Physical page length D Maximum logical page length

F Distance from edge of physical

Logical page

page to edge of logical page

1-13

Page 27

CHAPTER 1 GENERAL

The table below shows the printable areas when printing on Landscape for each paper size.

Size A B C D E F G

Letter

Legal

Folio

Executive

A 4

A 5

A 6

B 5 (JIS)

B 5 (ISO)

B 6 (ISO)

COM10

MONARCH

C 5

NOTE:

• The paper sizes indicated here should confirm to the nominal dimensions specified by JIS except B5 (ISO).

• The dot size is based on 300 dpi resolution.

279.4 mm

11.0” (3,300 dots)

355.6 mm

14.0” (4,200 dots)

330.2mm

13.0” (3,900 dots)

266.7 mm

10.5” (3,150 dots)

297.0 mm

11.69” (3,507 dots)

210.0 mm

8.27” (2,480 dots)

148.5 mm

5.85” (1,754 dots)

257.0 mm

10.11” (3,033 dots)

250.0 mm

9.84” (2,952 dots)

176.0 mm

6.93” (2,078 dots)

241.3 mm

9.5” (2,850 dots)

190.5 mm

7.5” (2,250 dots) 229 mm

9.01” (2,704 dots) 220 mm

8.66” (2,598 dots)

215.9 mm

8.5” (2,550 dots)

215.9 mm

8.5” (2,550 dots)

215.9 mm

8.5” (2,550 dots)

184.15 mm

7.25” (2,175 dots)

210.0 mm

8.27” (2,480 dots)

148.5 mm

5.85” (1,754 dots)

105.0 mm

4.13” (1,240 dots)

182.0 mm

7.1” (2,130 dots)

176.0 mm

6.93” (2,078 dots)

125.0 mm

4.92” (1,476 dots)

104.78 mm

4.125” (1,237 dots)

98.43 mm

3.875” (1,162 dots) 162 mm

6.38” (1,913 dots) 110 mm

4.33” (1,299 dots)

269.3 mm

10.6” (3,180 dots)

345.5 mm

13.6” (4,080 dots)

320.0mm

12.6” (3,780 dots)

256.6 mm

10.1” (3,030 dots)

287.0 mm

11.2” (3,389 dots)

200.0mm

7.87” (2,362 dots)

138.5 mm

5.45” (1,636 dots)

247.0 mm

9.72” (2,916 dots)

240.0 mm

9.44” (2,834 dots)

166.4 mm

6.55” (1,960 dots)

231.1 mm

9.1” (2,730 dots)

180.4 mm

7.1” (2,130 dots)

219.0 mm

8.62” (2,586 dots)

210.0 mm

8.26” (2,480 dots)

215.9 mm

8.5” (2,550 dots)

215.9 mm

8.5” (2,550 dots)

215.9 mm

8.5” (2,550 dots)

184.15 mm

7.25” (2,175 dots)

210.0 mm

8.27” (2,480 dots)

148.5 mm

5.85” (1,754 dots)

105.0 mm

4.13” (1,240 dots)

182.0 mm

7.1” (2,130 dots)

176.0 mm

6.93” (2,078 dots)

125.0 mm

4.92” (1,476 dots)

104.78 mm

4.125” (1,237 dots)

98.43 mm

3.875” (1,162 dots) 162 mm

6.38” (1,913 dots) 110 mm

4.33” (1,299 dots)

5.0 mm

0.2” (60 dots)

5.0 mm

0.2” (60 dots)

4.8 mm

0.19” (59 dots)

5.0 mm

0.2” (60 dots)

4.8 mm

0.19” (59 dots)

0 mm

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

4.2 mm

0.16” (50 dots)

2.13.2 PCL6/BR-Script3 emulation

You can not print within 4.2 mm (50dots in 300 dpi mode) on all four sides of the paper.

1-14

Page 28

2.14 Print Speeds with Various Settings

Print speed of the machine is up to 16/17 ppm when loading A4 or Letter size paper from the paper tray in the plain paper mode.

Actual print speed varies depending on the media type or paper size as shown in the tables below;

Media type setting All models

Transparencies Up to 16/17 ppm Thin Paper Up to 16/17 ppm Plain paper, Env.Thin Up to 16/17 ppm Thick Paper, Envelopes Up to 16/17 ppm Thicker/Bond Paper, Env.Thick 4 ppm *

Media type setting All models

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Transparency Up to 16/17 ppm Thin Paper Up to 16/17 ppm Plain paper, Env.Thin 8 ppm after 5 min. have passed. Thick Paper, Envelopes 8 ppm after 30 sec. have passed. Thicker/Bond Paper, Env.Thick 4 ppm *

*The print speed may vary according to conditions, such as paper size and paper tray.

NOTE:

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

• Max. speed is 16/17 ppm or more. It varies depending on the paper size.

2.15 Toner Cartridge Weight Information

Toner Cartridge Weight (approx weight)

Brand new Toner Cartridge Weight 827.5g 772.5g Toner Weight at Brand New Toner Cartridge 197.5±2.5g 142.5±2.5g Toner Cartridge Weight at Toner Near Empty 720-725g 720-725g Remain Toner Weight at Toner Near Empty 90-95g 90-95g Toner Cartridge Weight at Toner Empty 710-715g 710-715g Remain Toner Weight at Toner Empty 80-85g 80-85g

You can print 500 to 600 pages with 10g toner.

*Without yellow protector *Toner cartridge weight may vary within 2 to 3g depending on the cartridge weight.

TN7600/TN560 TN7300/TN530

1-15

Page 29

CHAPTER 1 GENERAL

3. SERIAL NO. DESCRIPTIONS

The descriptions below show how to understand the meanings of the numbers printed on the labels or bag of the machine and machine parts:

< ID for production month >

A: January B: February C: March D: April E: May F: June G: July H: August J: September K: October L: November M: December

< ID for year >

3: 2003 4: 2004

< ID for factory >

9: Kariya Plant A: Mie Brother C: BIUK J: Buji Nan Ling Factory

(1) Machine: Printed on the label attached on the rear of the main body

(2) Process unit: Imprinted on the aluminum bag

< SERIAL NO. >

U 6 0 6 6 1 E 3 J 1 1 1 0 1 1

FACTORY ID NO.

YEAR

MONTH

SEQUENTIAL NO.

(Drum unit with toner cartridge)

3 A 1 1 J A

YEAR MONTH

DATE

FACTORY ID NO.

(3) Drum unit: Printed on the bar code label attached inside the drum unit

PRODUCTION LINE NO.

A 3 9 5 1 0 0 1 0 4 A

MONTH

YEAR

TONER VOLUME

FACTORY ID NO.

SERIAL NO.

PRODUCT LINE NO.

1-16

Page 30

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(4) Toner cartridge: Imprinted on the aluminum bag

3 A 3 0 J

Printed on the bar code label attached on the toner cartridge

CARTRIDGE PRODUCTION INFO.

(5) Laser unit: On the laser unit

YEAR

MONTH

DATE

FACTORY ID NO.

M 3 9 A 0 0 0 1 9 9 A

YEAR

FACTORY ID NO.

SERIAL NO.

TONER VOLUME

PRODUCT LINE NO.

2 8 0 0 1

LASER UNIT NO. 8: LJ7516001 Las er Uni t ZL2

FACTORY ID NO.

PRODUCTION LOT NO.

1: Kariya Plant 2: Buji Nan Ling Factory

1-17

Page 31

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

CHAPTER 2 INSTALLATION AND BASIC OPERATION

1. CONDITIONS REQUIRED FOR INSTALLATION

1.1 Power Supply

• The source voltage must stay within ±10% of the rated voltage shown on the rating plate.

• The power cord, including extensions, should not exceed 5 meters (16.5 feet).

• Do no share the same power circuit with other high-power appliances, particularly an air

conditioner, copier or shredder. If it is unavoidable that you must use the machine with these appliances, it is recommended that you use an isolation transformer or a highfrequency noise filter.

• Use a voltage regulator if the power source is not stable.

1.2 Environment

• The machine should be installed near a power outlet, which is easily accessible.

• The room temperature is maintained between 10°C and 32.5°C. The relative humidity is

maintained between 20% and 80%.

• The machine should be used in a well ventilated room.

• Place the machine on a flat, horizontal surface.

• Keep the machine clean. Do not place the machine in a dusty place.

• Do not place the machine where the ventilation hole of the machine is blocked. Keep

approximately 100 mm (4 inches) between the ventilation hole and the wall.

• Do not place the machine where it is exposed to direct sunlight. Use a blind or a heavy curtain to protect the machine from direct sunlight when the machine is unavoidably set up near a window.

• Do not place the machine near devices that contain magnets or generate magnetic fields.

• Do not subject the machine to strong physical shocks or vibrations.

• Do not expose the machine to open flames or salty or corrosive gasses.

• Do not place objects on top of the machine.

• Do not place the machine near an air conditioner.

• Keep the machine horizontal when carrying.

• Do not cover the slots in the side cover.

SERVICE MANUAL

2-1

Page 32

CHAPTER 2 INSTALLATION AND BASIC OPERATION

2. UNPACKING

When unpacking the machine, check to see that all of the following components are included in the carton.

MFC

2 3

1. Control Panel

2. Face-down Output Tray Support Flap (Support Flap)

3. Manual Feed Tray (For MFC-8420, DCP-8020) Multi-purpose Tray (MP Tray) (For MFC-8820D/8820DN, DCP-8025D/8025DN)

ADF Support

4. Paper Tray

5. Front Cover

6. Power Switch

7. Document Cover

8. Automatic Document Feeder (ADF)

Drum Unit Assembly

(including Toner Cartridge)

Quick Setup Guide

CD-ROMs For Windows (1 piece) For Macintosh (1 piece)

User's Guide

AC Power Cord

Telephone

Line Cord

Test Sheet

(U.S.A. only)

Fig. 2-1

Accessory Order Form

(U.S.A./Canada only)

Carton components may differ from one country to another. Save all packing materials and the carton.

NOTE:

• The interface cable is not a standard accessory. Please purchase the appropriate interface cable for the interface you intend to use (Parallel or USB).

• For Parallel use a bi-directional shield interface cable that is IEEE 1284-compliant, and not longer than 6 feet (2 meters).

• For USB: use a Hi-Speed USB 2.0 interface cable that is not longer than 6 feet (2 meters).

• Please make sure that you use a Hi-Speed USB 2.0 certified cable if your computer uses

a Hi-Speed USB 2.0 interface.

• Even if your computer has a USB 1.1 interface, you can connect the machine.

2-2

Page 33

3. INSTALL THE MACHINE

You need to implement hardware setup and driver installation to use the machine. Firstly, identify the Operating System on your computer. (Windows

4.0, Windows® 2000/XP and Macintosh)Then, purchase the appropriate interface cable

(Parallel, USB or Network) for your computer. Most existing parallel cables support bidirectional communication, but some might have an incompatible pin assignment or may not be IEEE 1284-compliant.

The installation programs for the hardware setup and driver installation are contained on the supplied CD-ROM.

3.1 For All Users

For Windows

(1) Turn on the PC power. Insert the supplied CD-ROM into the CD-ROM drive. The

opening screen will appear automatically. Follow the on-screen instructions.

NOTE: If the opening screen does not appear; click Start and select Run. Then, enter the CD-drive

letter and type \START.EXE (for example: D:\START.EXE).

(2) Click the Initial Setup icon on the menu screen. (3) You can view the Initial Setup instructions.

For Macintosh users

ââââ

users

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

95/98/Me, Windows NT

SERVICE MANUAL

(1) Turn on the Macintosh. Insert the CD-ROM into the CD-ROM drive. (2) Double click the Start Here icon or Start Here OS X icon. Follow the on-screen

instructions. (3) Click the Initial Setup icon on the menu screen. (4) You can view the Initial Setup instructions.

2-3

Page 34

CHAPTER 2 INSTALLATION AND BASIC OPERATION

3.1.1 Install the Automatic Document Feed (ADF) support

(1) Open the ADF cover.

Fig. 2-2

Fig. 2-3

(2) Slide ADF support into the groove on ADF.

DF cover

Fig. 2-4

2-4

Page 35

(3) Close the ADF cover.

3.1.2 Install the drum unit assembly

(1) Open the front cover by pressing the front cover release button. (2) Unpack the drum unit assembly. Remove the protective part. (3) Rock it from side to side several times to distribute the toner evenly inside the assembly.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Fig. 2-5

Fig. 2-6

(4) Push the drum unit assembly into the machine (until it snaps into place).

Fig. 2-7

(5) Close the front cover of the machine.

2-5

Page 36

CHAPTER 2 INSTALLATION AND BASIC OPERATION

3.1.3 Load paper into the paper tray

(1) Pull the paper tray completely out of the machine. (2) While pressing the paper guide release lever, slide the adjusters to fit the paper size.

Check that the guides are firmly in the slots on the tray.

Paper guide release lever

Universal guide release button

Fig. 2-8

NOTE: For Legal size paper, press the universal guide release button and pull out the back of the

paper tray.

(3) Fan the stack of paper well to avoid paper jams and misfeeds. (4) Put paper in the paper tray. Check that the paper is flat in the tray and below the

maximum paper mark.

Fig. 2-9

(5) Put the paper tray firmly back in the machine and unfold the support flap before you use

the machine.

Fig. 2-10

2-6

Page 37

3.1.4 Release the scanner lock

(1) Push the lever up to unlock the scanner. (Refer to Fig.2-11.)

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Scanner lock lever

Fig. 2-11

2-7

Page 38

CHAPTER 2 INSTALLATION AND BASIC OPERATION

3.2 Installing the Driver & Software

3.2.1 For USB Interface Cable Users (For Windows® 98/98SE/Me/2000 Professional/XP)

(1) Switch off and unplug the machine from the AC outlet and disconnect it from your

computer, if you already connected an interface cable.

(2) Turn on your computer.

(For Windows

2000 Professional/XP, you must be logged on as the administrator.)

(3) Insert the supplied CD-ROM for the operating system you are using into your CD-ROM

drive. If the model name screen appears, select your machine. If the language screen appears, select your language..

(4) The CD-ROM main menu will appear.

Click Install Software.

NOTE: If this window does not appear, use Windows

Explore to run the setup.exe program from the

root directory of the Brother CD-ROM.

(5) Click MFL-Pro Suite in Main Application.

NOTE:

• MFL-Pro Suite includes Printer Driver, Scanner Driver, ScanSoft

Text Bridge

• PaperPort

• ScanSoft

, PC-FAX software, Remote Setup and True Type fonts.

is a document management application for viewing scanned documents.

TextBridge®, which is integrated into PaperPort®, is an OCR application that

PaperPort ®, ScanSoft®

converts an image into text and inserts it into your default word processor.

(6) Click Install.

NOTE:

• If you see the following screen, click OK to install the Windows

updates. After the

updates are installed your PC may restart.

• If it does the installation will automatically continue.

• If the installation does not continue automatically, please open the installer menu again by

double-clicking the setup.exe program from the root directory of the Brother CD-ROM, and

continue from Step (4).

(7) When the PaperPort

8.0 SE Setup window is displayed, click Next.

(8) After reading and accepting the ScanSoft License Agreement, enter your user

information and click Next. (9) Select Typical and click Next. (10) Click Install and PaperPort

will start installing on your computer.

(11) When the ScanSoft Registration screen is displayed, make your selection and follow the

on-screen instructions. (12) Click Finish to complete installation.

2-8

Page 39

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(13) When the Brother MFL-Pro Suite Installation window appears, click Next.

NOTE:

• If an error message appears during the installation process, or if you have previously

installed the MFL-Pro Suite, you will first have to uninstall it.

• From the Start menu, select Programs, Brother, Brother MFL-Pro Suite, Uninstall, and

then follow the instructions on the screen.

(14) When the Brother Software License Agreement window appears, click Yes. (15) Select Local Interface, and then click Next. (16) Select Standard, and then click Next. The application files will be copied and installed to

your computer.

< For Windows

98/98SE/Me Users Only >

Make sure that you followed the instructions in (1) to (16) on pages 2-8 to 2-9.

(17) When this screen appears, connect the USB interface cable to your PC, and then

connect it to the machine. Turn on the machine by plugging in the power cord. Turn the power switch on. It will take a few seconds for the installation screen to appear. The installation of the Brother drivers will automatically start. Follow the instructions on

the screen. (18) Select BRUSB: USB Printer Port, and then click Next. (19) Accept the default Printer name by selecting Yes, and then click Next. (20) Select Yes (recommended), and then click Finish. A test page will be printed so you

can check the print quality.

(21) If the test page is printed correctly, click Yes. If you click No, follow the prompts on the

screen to correct the problem.

(22) The README.WRI file will be displayed. Please read this file for troubleshooting

information and then close the file to continue installation. (23) Click Finish to restart your computer. (24) After the computer restarts, click Yes to have the Control Center load each time

Windows

is started. The Control Center will appear as an icon in the task tray.

If you click No the Scan keys on the machine will be disabled.

NOTE: Even if you select NO, later you will be able to launch the Brother Control Center to use the

Scan to key by double clicking the Smart UI icon on the desktop. This loads the Brother Control Center to the task tray. See AutoLoad the Brother Control Center, Chapter 15 in the Documentation (User’s Guide) located on the CD-ROM.

OK: The Brother PC-FAX, Printer and Scanner drivers have been installed and the

installation is now complete.

2-9

Page 40

CHAPTER 2 INSTALLATION AND BASIC OPERATION

< For Windows

2000 Professional Users Only >

Make sure that you followed the instructions in (1) to (16) on pages 2-8 to 2-9.

(17) When this screen appears, connect the USB interface cable to your PC, and then

connect it to the machine.

Turn on the machine by plugging in the power cord. Turn the power switch on.

It will take a few seconds for the installation screen to appear.

The installation of the Brother drivers will automatically start. Follow the instructions on

the screen. (18) If the Digital Signa ture Not Found dialog boxes appear, click Yes to install the driver. (19) The README.WRI file will be displayed.

Please read this file for troubleshooting information and then close the file to continue

installation. (20) Click Finish to restart your computer. (21) After the computer restarts, click Yes to have the Control Center load each time

Windows

is started. The Control Center will appear as an icon in the task tray.

If you click No the Scan keys on the machine will be disabled.

NOTE: Even if you select NO, later you will be able to launch the Brother Control Center to use the

OK: This completes the installation of the Windows® Logo Tested (WHQL) printer driver and

the Brother PC-FAX and scanner drivers. Brother also offers a Native Driver on the CD-ROM. The Brother Native Driver offers

some features that are not available with the Windows® Logo Tested Driver. To install the Brother Native driver proceed to step (22).

Brother Native driver Installation (22) Click Start and select Settings and then Pointers. Click on Add a printer and the Add

Printer Wizard will start. When this screen appears, click Next.

(23) Un-check the Automatically detect and install my Plug and Play printer selection

and then click Next.

(24) Select USBXXX from the pull down window for the Printer Port Selection and then click

Next. (25) Click on Have Disk. (26) Browse the CD-ROM for the W2K folder.

Highlight the W2K folder and click Open.

Highlight the Addprt folder and click Open. (27) Click Open.

2-10

Page 41

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(28) Make sure X:\W2K\Addprt is displayed in the window and click OK (X:\ is the drive

letter of your CD-ROM). (29) Highlight the model you are installing from the list of machines and click Next. (30) The model you are installing will be listed in the window. Select Yes or No if you want

this driver to be your default printer. (31) Select Do not share this printer and Next. (32) Select Yes and Next to print a test page. (33) When this screen appears, click Finish. (34) If the Digital Signature Not Found dialog box appears, click Yes. (35) If the test page printed, click OK.

NOTE:

• There will be two Brother printer drivers listed in the Printers selection.

• The driver with "Printer" after the model name (ex. Brother MFC-8820D Printer) is the

Brother Native Driver.

OK: The Brother Native Drivers have been installed and the installation is now complete.

< For Windows

XP Users Only >

Make sure that you followed the instructions in (1) to (16) on pages 2-8 to 2-9.

(17) When this screen appears, connect the USB interface cable to your PC, and then

after another, please wait for a while.

(18) The README.WRI file will be displayed.

Please read this file for troubleshooting information and then close the file to continue installation.

(19) Click Finish to restart your computer.

OK: This completes the installation of the Windows® Logo Tested (WHQL) printer driver and

the Brother PC-FAX and scanner drivers. Brother also offers a Native Driver on the CD-ROM. The Brother Native Driver offers

some features that are not available with the Windows® Logo Tested Driver. To install the Brother Native driver proceed to step (20).

2-11

Page 42

CHAPTER 2 INSTALLATION AND BASIC OPERATION

Brother Native driver Installation (20) Click Start and select Printers and Faxes.

Click on Add a printer and the Add Printer Wizard will start. When this screen appears, click Next.

(21) Un-check the Automatically detect and install my Plug and Play printer selection

and then click Next.

(22) Select USBXXX from the pull down window for the Printer Port Selection and then click

Next. (23) Click on Have Disk. (24) Browse the CD-ROM for the WXP folder.

Highlight the WXP folder and click Open.

Highlight the Addprt folder and click Open. (25) Click Open. (26) Make sure X:\WXP\Addprt is displayed in the window and click OK (X:\ is the drive your

CD-ROM). (27) Highlight the model you are installing from the list of machines and click Next. (28) The model you are installing will be listed in the window. Select Yes or No if you want

this driver to be your default printer. (29) Select Do not share this printer and Next. (30) Select Yes and Next to print a test page. (31) When this screen appears, click Finish. (32) When the Windows Logo testing screen appears, click Continue Anyway.

NOTE:

• There will be two Brother printer drivers listed in the “Printers” selection.

• The driver with Printer after the model name (ex. Brother MFC-8820D Printer) is the

Brother Native Driver.

OK: The Brother Native Drivers have been installed and the installation is now complete.

2-12

Page 43

3.2.2 For Parallel Interface Cable Users (For Windows

(1) Switch off and unplug the machine from the AC outlet and disconnect it from your

computer, if you already connected an interface cable.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

95/98/98SE/Me/2000 Professional/XP)

SERVICE MANUAL

(2) Turn on your computer.

(For Windows

2000 Professional/XP, you must be logged on as the administrator.)

(3) Insert the supplied CD-ROM for the operating system you are using into your CD-ROM

drive. If the model name screen appears, select your machine. If the language screen appears, select your language.

(4) The CD-ROM main menu will appear.

Click Install Software.

NOTE: If this window does not appear, use Windows

Explore to run the setup.exe program from the

root directory of the Brother CD-ROM.

(5) Click MFL-Pro Suite in Main Application.

NOTE:

• MFL-Pro Suite includes Printer Driver, Scanner Driver, ScanSoft

ScanSoft PaperPort

• ScanSoft

Text Bridge®, PC-FAX software, Remote Setup and True Type fonts.

is a document management application for viewing scanned documents.

TextBridge®, which is integrated into PaperPort ®, is an OCR application that

PaperPort®,

converts an image into text and inserts it into your default word processor.

(6) Click Install.

NOTE:

• If you see the following screen, click OK to install the Windows

updates. After the

updates are installed your PC may restart.

• If it does the installation will automatically continue.

• If the installation does not continue automatically, please open the installer menu again by

double-clicking the setup.exe program from the root directory of the Brother CD-ROM, and continue from step (4).

(7) When the PaperPort

8.0 SE Setup window is displayed, click Next.

(8) After reading and accepting the ScanSoft License Agreement, enter your user

information and click Next. (9) Select Typical and click Next. (10) Click Install and PaperPort

will start installing on your computer.

(11) When the ScanSoft Registration screen is displayed, make your selection and follow the

on- screen instructions. (12) Click Finish to complete installation. (13) When the Brother MFL-Pro Suite Installation window appears, click Next.

NOTE: If an error message appears during the installation process, or if you have previously installed

the MFL-Pro Suite, you will first have to uninstall it. From the Start menu, select Programs, Brother, Brother MFL-Pro Suite, Uninstall, and then follow the instructions on the screen.

2-13

Page 44

CHAPTER 2 INSTALLATION AND BASIC OPERATION

computer.

< For Windows

95/98/98SE/Me Users Only >

Make sure that you followed the instructions in (1) to (16) on pages 2-13 to 2-14.

(17) When this screen appears, connect the parallel interface cable to your PC, and then

connect it to the machine.

Turn on the machine by plugging in the power cord. Turn the power switch on. (18) Click Next. (19) The README.WRI file will be displayed.

Please read this file for troubleshooting information and then close the file to continue

installation. (20) Click Finish to restart your computer. (21) After the computer restarts, the installation of the Brother drivers will automatically start.

Follow the instructions on the screen.

(22) Click Yes to have the Brother MFL-Pro Control Center load each time Windows

started. The Control Center will appear as an icon in the task tray.

If you click No the Scan keys on the machine will be disabled.

NOTE: Even if you select NO, later you will be able to launch the Brother Control Center to use the

OK: The Brother PC-FAX, Printer and Scanner drivers have been installed and the

installation is now complete.

< For Windows

2000 Professional Users Only >

Make sure that you followed the instructions in (1) to (16) on pages 2-13 to 2-14.

(17) When this screen appears, connect the parallel interface cable to your PC, and then

connect it to the machine.

Turn on the machine by plugging in the power cord. Turn the power switch on. (18) Click the Next. (19) The README.WRI file will be displayed.

Please read this file for troubleshooting information and then close the file to continue

installation.

2-14

Page 45

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(20) Click Finish to restart your computer. (21) After the computer restarts, the installation of the Brother drivers will automatically start.

Follow the instructions on the screen. (22) If the Digital Signature Not Found dialog boxes appear, click Yes to install the driver.

(23) Click Yes to have the Control Center loaded each time Windows

is started. The Control

Center will appear as an icon in the task tray.

If you click No the Scan keys on the machine will be disabled.

NOTE: Even if you select NO, later you will be able to launch the Brother Control Center to use the

Scan to key by double clicking the Smart UI icon on the desktop. This loads the Brother Control Center to the task tray. See AutoLoad the Brother Control Center, Chapter 15 in the Dcumentation (User’s Guide) located on the CD-ROM.

OK: This completes the installation of the Windows ® Logo Tested (WHQL) printer driver and

the Brother PC-FAX and scanner drivers. Brother also offers a Native Driver on the CD-ROM. The Brother Native Driver offers

some features that are not available with the Windows ® Logo Tested Driver. To install the Brother Native driver proceed to step (21).

Brother Native driver Installation

(24) Click Start and select Settings and then Pointers. Click on Add a printer and the Add

Printer Wizard will start.

When this screen appears, click Next. (25) Un-check the Automatically detect and install my Plug and Play printer selection and

then click Next. (26) Select BMFC (Brother MFL Port) from the pull down window for the Printer Port

Selection and then click Next. (27) Click on Have Disk. (28) Browse the CD-ROM for the W2K folder.

Highlight the W2K folder and click Open.

Highlight the Addprt folder and click Open. (29) Click Open. (30) Make sure X:\W2K\Addprt is displayed in the window and click OK (X:\ is the drive letter

of your CD-ROM). (31) Highlight the model you are installing from the list of machines and click Next. (32) The model you are installing will be listed in the window. Select Yes or No if you want this

driver to be your default printer. (33) Select Do not share this printer and Next. (34) Select Yes and Next to print a test page. (35) When this screen appears, click Finish. (36) If the Digital Signature Not Found dialog box appears, click Yes. (37) If the test page printed, click OK.

2-15

Page 46

CHAPTER 2 INSTALLATION AND BASIC OPERATION

NOTE:

• There will be two Brother printer drivers listed in the Printers selection.

• The driver with "Printer" after the model name (ex. Brother MFC-8820D Printer) is the

Brother Native Driver.

OK: The Brother Native Drivers have been installed and the installation is now complete.

< For Windows

XP Users Only >

Make sure that you followed the instructions in (1) to (16) on pages 2-13 to 2-14.

(17) When this screen appears, connect the parallel interface cable to your PC, and then

connect it to the machine.

Turn on the machine by plugging in the power cord. Turn the power switch on.

The installation of the Brother drivers will automatically start.

The screen appears one after another, please wait for a while.

(18) The README.WRI file will be displayed.

Please read this file for troubleshooting information and then close the file to continue

installation.

(19) When the following screen appears, click Finish and wait as the PC restarts Windows

and continues the installation.

OK: This completes the installation of the Windows® Logo Tested (WHQL) printer driver and

the Brother PC-FAX and scanner drivers. Brother also offers a Native Driver on the CD-ROM. The Brother Native Driver offers

some features that are not available with the Windows® Logo Tested Driver. To install the Brother Native driver proceed to step (20).

Brother Native driver Installation (20) Click Start and select Printers and Faxes.

Click on Add a printer and the Add Printer Wizard will start.

When this screen appears, click Next.

(21) Un-check the Automatically detect and install my Plug and Play printer selection and

then click Next.

(22) Select BMFC (Brother MFL Port) from the pull down window for the Printer Port

Selection and then click Next. (23) Click on Have Disk. (24) Browse the CD-ROM for the WXP folder.

Highlight the WXP folder and click Open.

Highlight the Addprt folder and click Open. (25) Click Open. (26) Make sure X:\WXP\Addprt is displayed in the window and click OK (X:\ is the drive letter

of your CD-ROM).

2-16

Page 47

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(27) Highlight the model you are installing from the list of machines and click Next. (28) The model you are installing will be listed in the window. Select Yes or No if you want this

driver to be your default printer. (29) Select Do not share this printer and Next. (30) Select Yes and Next to print a test page. (31) When this screen appears, click Finish. (32) When the Windows Logo testing screen appears, click Continue Anyway.

NOTE:

• There will be two Brother printer drivers listed in the Printers selection.

• The driver with "Printer" after the model name (ex. Brother MFC-8820D Printer) is the

Brother Native Driver.

OK: The Brother Native Drivers have been installed and the installation is now complete.

2-17

Page 48

CHAPTER 2 INSTALLATION AND BASIC OPERATION

3.2.3 For Windows NT

Workstation Version 4.0 Users

(1) Turn on your computer.

You must be logged on as the Administrator. (2) Connect the parallel interface cable to your computer, and then connect it to the machine. (3) Make sure you turn on the machine by plugging in the power cord, and turning the power

switch on.

(4) Insert the Supplied CD-ROM for the operating system you are using into your CD-ROM

drive. If the model name screen appears, select your machine. If the language screen appears, select your language.

(5) The CD-ROM main menu will appear.

Click Install Software.

NOTE:

If this window does not appear, use Windows

Explore to run the setup.exe program from the

root directory of the Brother CD-ROM.

(6) Click MFL-Pro Suite in Main Application.

NOTE:

• MFL-Pro Suite includes Printer Driver, Scanner Driver, ScanSoft

Text Bridge

• PaperPort

• ScanSoft

, PC-FAX software, Remote Setup and True Type fonts.

is a document management application for viewing scanned documents.

TextBridge®, which is integrated into PaperPort®, is an OCR application that

PaperPort® ScanSoft®,

converts an image into text and inserts it into your default word processor.

(7) Click Install.

NOTE:

• If you see the following screen, click OK to install the Windows

updates. After the updates

are installed your PC may restart.

• If it does the installation will automatically continue.

• If the installation does not continue automatically, please open the installer menu again by

double-clicking the setup.exe program on the Brother CD-ROM, and continue from Step (5).

(8) When the PaperPort

8.0 SE Setup window is displayed, click Next.

(9) After reading and accepting the ScanSoft License Agreement, enter your user

information and click Next. (10) Select Typical and click Next. (11) Click Install and PaperPort

will start installing on your computer.

(12) When the ScanSoft Registration screen is displayed, make your selection and follow the

on- screen instructions. (13) Click Finish to complete installation. (14) When the Brother MFL-Pro Suite Installation window appears, click Next.

NOTE: If an error message appears during the installation process, or you have previously installed

MFL-Pro Suite, you will first have to uninstall it. From the Start menu, select Programs, Brother, Brother MFL-Pro Suite, Uninstall, and then follow the instructions on the screen.

2-18

Page 49

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(15) When the Brother Software License Agreement window appears, click Yes. If you agree

to it and go to next screen. (16) Select Local Interface, and then click Next. (17) When the Setup Type window appears, select Standard, and then click Next. (18) The README.WRI file will be displayed.

Please read this file for troubleshooting information and then close the file to continue

installation. (19) Click Finish restart your computer. (20) After the computer restarts, click Yes to have the Control Center load each time

Windows

is started. The Control Center will appear as an icon in the task tray.

If you click No the Scan keys on the machine will be disabled.

NOTE: Even if you select NO, later you will be able to launch the Brother Control Center to use the

OK: The Brother PC-FAX, Printer and Scanner drivers have been installed and the

installation is now complete.

2-19

Page 50

CHAPTER 2 INSTALLATION AND BASIC OPERATION

3.2.4 For Network Interface Cable Users (For Windows Professional/XP)

(1) Connect the network cable to the machine, and then connect it to a free port on your hub.

Turn on the machine by plugging in the power cord. Turn the power switch on.

95/98/98SE/Me/NT/2000

(2) Turn on y our computer.

(For Windows

2000 Professional/XP, you must be logged on as the administrator.)

(3) Insert the supplied CD-ROM for the operating system you are using into your CD-ROM

drive. If the model name screen appears, select your machine. If the language screen appears, select your language.

(4) The CD-ROM main menu will appear.

Click Install Software.

NOTE: If this window does not appear, use Windows

Explore to run the setup.exe program from the

root directory of the Brother CD-ROM.

(5) Click MFL-Pro Suite in Main Application.

NOTE:

• MFL-Pro Suite includes Printer Driver, Scanner Driver, ScanSoft ScanSoft

• PaperPort

• ScanSoft

Text Bridge®, PC-FAX software and True Type fonts.

is a document management application for viewing scanned documents.

TextBridge®, which is integrated into PaperPort®, is an OCR application that

PaperPort®,

converts an image into text and inserts it into your default word processor.

(6) Click Install.

NOTE:

• If you see the following screen, click OK to install the Windows

updates. After the updates

are installed your PC may restart.

• If it does the installation will automatically continue.

• If the installation does not continue automatically, please open the installer menu again by

double-clicking the setup.exe program from the root directory of the Brother CD-ROM, and continue from Step (4).

(7) When the PaperPort

8.0 SE Setup window is displayed, click Next.

(8) After reading and accepting the ScanSoft License Agreement, enter your user

information and click Next. (9) Select Typical and click Next. (10) Click Install and PaperPort

will start installing on your computer.

(11) When the ScanSoft Registration screen is displayed, make your selection and follow the

on- screen instructions. (12) Click Finish to complete installation. (13) When the Brother MFL-Pro Suite Installation window appears, click Next.

NOTE: If an error message appears during the installation process, or if you have previously installed

the MFL-Pro Suite, you will first have to uninstall it. From the Start menu, select Programs, Brother, Brother MFL-Pro Suite, Uninstall, and then follow the instructions on the screen.

2-20

Page 51

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

(14) When the Brother Software License Agreement window appears, click Yes. (15) Select Network Interface, and then click Next. (16) Select Standard, and then click Next.

The application files will be copied to your computer.

(17) Select Search from a list of available devices, and then click Next.

NOTE: If you see the following screen, click OK.

(18) If the machine is un-configured for your network:

Select the un-configured device from the list and then click Next. Go to (19) If the machine is configured for your network:

Select the machine from the list and then click Next. Go to (22) (19) Click Configure IP Address. (20) Enter the proper IP Address information for your network, and then click OK.

(e.g. Enter 10.134.43.79 for IP Address)

SERVICE MANUAL

(21) Click Next.

NOTE: See the For Administrator section of this guide or the NC-9100h User's Guide located on the

CD-ROM for more network configuration information.

Windows Windows

98/Me/2000/XP Users Go to (22)

95/NT Users Go to (24)

(22) Select yes and then click Next. (23) Click Next or enter the name you want displayed on the LCD for your PC and then click

Next. The default name is the name of your PC.

NOTE: You can avoid receiving unwanted documents by setting a 4-digit PIN Number.

For Windows

98/Me/2000/XP Users Only

Please wait for the window to open.

(24) Click Finish restart your computer.

Windows

95/98/98SE/Me/NT/2000 Users follow step (25).

NOTE: The Network Scanning feature is not supported in Windows

95 or NT.

OK: For Windows® XP Users Only The Brother PC-FAX, Printer and Scanner drivers have been installed and the

installation is now complete.

2-21

Page 52

CHAPTER 2 INSTALLATION AND BASIC OPERATION

(25) After the computer restarts, click Yes to have the Control Center load each time

Windows

is started. The Control Center will appear as an icon in the task tray.

If you click No the Scan keys on the machine will be disabled.

NOTE: Even if you select NO, later you will be able to launch the Brother Control Center to use the

OK: For Windows® 98/Me/2000 Users The Brother PC-FAX, Printer and Scanner drivers have been installed and the

installation is now complete. For Windows® 95/NT Users

The Brother PC-FAX and Printer drivers have been installed and the installation is now complete.

2-22

Page 53

3.2.5 For USB Interface Cable Users (For Mac

(1) Switch off and unplug the machine from the AC outlet and disconnect it from your

Macintosh if you already connected an interface cable.

(2) Turn on your Macintosh

(3) Insert the supplied CD-ROM for the operating system you are using into your CD-ROM

drive.

(4) Double-click the Start Here! icon to install the printer, scanner and PC-FAX Send

drivers. If the language screen appears, select your language. (5) Click MFL-Pro Suite for your country to install. (6) After the installation is completed, restart your Macintosh (7) Connect the USB interface cable to your Macintosh

Caution Do not connect the machine to a USB port on a keyboard or a non powered USB hub.

(8) Turn on the machine by plugging in the power cord. Turn the power switch on. (9) From the Apple

menu, open the Chooser.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

OS 8.6 to 9.2 Users)

, and then connect it to the machine.

SERVICE MANUAL

(10) Click the Brother Laser icon you installed.

On the right side of the Chooser, select the printer to which you want to print. Close the Chooser.

OK: The Brother PC-FAX Send, Printer and Scanner drivers have been installed.

(11) To install Presto! Page Manager, click the Presto! PageManager icon and follow on the

Screen instructions.

NOTE: You can easily scan, share and organize photos and documents using Presto! PageManager

OK: Presto! PageManager® has been installed and the installation is now complete.

2-23

Page 54

CHAPTER 2 INSTALLATION AND BASIC OPERATION

3.2.6 For USB Interface Cable Users (For Mac

(1) Switch off and unplug the machine from the AC outlet and disconnect it from your

Macintosh if you already connected an interface cable.

(2) Turn on your Macintosh

(3) Insert the supplied CD-ROM for the operating system you are using into your CD-ROM

drive.

(4) Double-click the Start Here OS X icon to install the printer driver, Scanner driver, Brother

PC-FAX Send and Remote Setup program. If the language screen appears, select your

language. (5) Click MFL-Pro Suite to install. (6) Connect the USB interface cable to your Macintosh

Caution Do not connect the machine to a USB port on a keyboard or a non powered USB hub.

(7) Turn on the machine by pluging in the power cord. Turn the power switch on.

OS X 10.1/10.2.1 or greater Users)

, and then connect it to the machine.

(8) Select Applications from the Go menu. (9) Open the Utilities folder. (10) Open the Printer Center icon.

(11) Click Add Printer....

(12) Select USB. (13) Select MFC-XXXX, and then click Add. (14) Select Quit Printer Center from the Printer Center menu.

OK: The Brother Printer driver, Scanner driver, Brother PC-FAX Send and Remote Setup

Program have been installed and the installation is now complete.

(15) To install Presto! Page Manager, click the Presto! PageManager icon and follow on the

Screen instructions.

NOTE: You can easily scan, share and organize photos and documents using Presto! PageManager

OK: Presto! PageManager® has been installed and the installation is now complete.

2-24

Page 55

3.2.7 For Network Interface Cable Users (For Mac

(1) Switch off and unplug the machine from the AC outlet and disconnect it from your

Macintosh if you already connected an interface cable.

(2) Turn on your Macintosh

(3) Insert the supplied CD-ROM for the operating system you are using into your CD-ROM

drive.

(4) Double-click the Start Here! icon to install the printer, scanner and PC-FAX Send drivers.

If the language screen appears, select your language. (5) Click MFL-Pro Suite for your country to install. (6) After the installation is completed, restart your Macintosh (7) Connect the network interface cable to the printer, and then connect it to a free port on

your hub. (8) Turn on the machine by plugging in the power cord. Turn the power switch on. (9) Open the Chooser from the Apple menu. (10) Click the Brother Laser (AT) icon, and then select BRN_xxxxxx_P1.

Close the Chooser.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

OS 8.6 to 9.2 Users)

SERVICE MANUAL

NOTE: xxxxxx are the last six digits of the Ethernet address.

OK: The setup is now complete.

2-25

Page 56

CHAPTER 2 INSTALLATION AND BASIC OPERATION

3.2.8 For Network Interface Cable Users (For Mac

(1) Switch off and unplug the machine from the AC outlet and disconnect it from your

Macintosh if you already connected an interface cable.

(2) Turn on your Macintosh

(3) Insert the supplied CD-ROM for the operating system you are using into your CD-ROM

drive.

(4) Double-click the Start Here OS X folder to install the printer driver and Remote Setup

program. If the language screen appears, select your language. (5) Click MFL-Pro Suite to install. (6) Connect the network interface cable to the printer, and then connect it to a free port on

your hub. (7) Turn on the machine by plugging in the power cord. Turn the power switch on. (8) Select Applications from the Go menu. (9) Open the Utilities folder. (10) Open the Print Center icon. (11) Click the Add Printer... button..

OS X 10.1/10.2.1 or greater Users)

(12) Select AppleTalk. (13) Select BRN_xxxxxx_P1, and then click the Add button.

NOTE: xxxxxx are the last six digits of the Ethernet address.

(14) Select Quit Printer Center from the Printer Center menu.

OK: The setup is now complete.

NOTE: For Mac

OS 10.2.1 or greater Users Only Please visit http://solutions.brother.com/ for

information about using Rendezvous.

2-26

Page 57

CHAPTER 3 THEORY OF OPERATION

1. ELECTRONICS

1.1 General Block Diagram

Fig. 3-1 shows a general block diagram.

Host Computer

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Control panel

- ADF motor

Scanner unitADF unitNCU*Line Speaker

- CCD unit

- CCD motor

Centronics parallel interface

Control Section

Fax data

Laser printing unit

Charging, exposing, developing, transferring, and heat-fixing processes

- Electrical charger

- Laser unit (including the polygon motor)

- Laser-sensitive drum

- Developer roller

- T ransf er roller

- Heater roller

- Main motor

Printer data

USB interface

Paper feeding mechanism

Low- and high-voltage power supplies

*Provided on models supporting facsimile function.

Fig. 3-1

3-1

Page 58

CHAPTER 3 THEORY OF OPERATION

1.2 Main PCB Block Diagram

Fig. 3-2 shows the block diagram of the main PCB.

Reset Circuit

Program + Font ROM 1MB, 4MB, 8MB

Network Program

(

1.5

MB)

STRAGE (0.5 MB)

CPU Core

(SPARClite 133MHz)

BUS

INT

A S I C

Oscillator 66.6MHz

Address Decoder

DRAM Control

Timer

FIFO

RAM 4MB, 8MB, 16MB

RAM (DIMM) (max. 128MB)

EEPROM 512 x 8 bit, 8192 x 8 bit

CCD unit

Scanner Controller

To Engine PCB

CDCC Parallel I/O

USB I/O

Oscillator 12MHz

Soft Support

EEPROM I/O

Engine Control I/O

PCI Bus Control

To PC

Fig. 3-2

3-2

Page 59

1.3 Main PCB

For the entire circuit diagram of the main PCB, see APPENDIX 4.1 to 4.6 ‘MAIN PCB CIRCUIT

DIAGRAM’ in this manual.

1.3.1 CPU

A Fujitsu 32bit RISC CPU, SPARClite is built in the ASIC. While the CPU is driven with a clock frequency of 66.66 MHz in the user logic block, it itself runs at 133.33 MHz, which is generated by multiplying the source clock by two.

DATA[0] DATA[1] DATA[2] DATA[3] DATA[4] DATA[5] DATA[6] DATA[7] DATA[8] DATA[9] DATA[10] DATA[11] DATA[12] DATA[13] DATA[14] DATA[15]

DATA[15-0]

6F/8F/3-6A

@C88

AT-49 66.6666MHZ

The functions of the interface block communication with external devices are described below;

1.3.2 USB

C270

@X3

@C91

C2P

TP1000

C159

C103

R88

VDD3

R87

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

VDD3

10k

R26

R25

R29

TP705

TP6

1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

@U8

XIN

XOUT

FRSEL

S0 CY25814

@R103 0

@R107 0

TP7

TP8

TP9

59 60 61 62 63 64 67 68 69 70 71 72 73 74 75

TP739

196

VDD3

C77

TP5

216

C101

SSCLK

VDD

VSS

@C83

C103

DATA00 DATA01 DATA02 DATA03 DATA04 DATA05 DATA06 DATA07 DATA08 DATA09 DATA10 DATA11 DATA12 DATA13 DATA14 DATA15 DATA16/IO DATA17/IO DATA18/IO DATA19/IO DATA20/IO DATA21/IO DATA22/IO DATA23/IO DATA24/IO DATA25/IO DATA26/IO DATA27/IO DATA28/IO DATA29/IO DATA30/IO DATA31/IO

EXINTN0

RSTN

SCKOUT

SCKIN

Aurora

VDD3

ADR01/24

ADR15/BA0

ADR16/BA1 ADR17/RASN ADR18/CASN

ADR19/WEN ADR20/DQM0 ADR21/DQM1 ADR22/DQM2 ADR23/DQM3

TP728

RA11

TP729

RA12

TP730

RA14

TP731

RA13

@R100

@R104

L23

0.68uH

TP195

TP2

TP3

ADR02 ADR03 ADR04 ADR05 ADR06 ADR07 ADR08 ADR09 ADR10 ADR11 ADR12 ADR13 ADR14

ROMCSN0 ROMCSN1

IOWEN IORDN

SDCLK0 SDCLK1 SDCLK2

SDCKE0 SDCKE1

SDCSN0 SDCSN1 SDCSN2

SDSDA SDSCL

TP35

9 10 11 12 13 14 15 16 17 18 19 25 26 27 28 29 30 31 32 33 34 35 36

211 212

213 214

95 94 93

96 97

90 89 88

92 91

R124

RA7 0

6 2 1

RA8 0

4 3 2 1

RA9 0

4 3 2 1

RA10

4 3 2 1

R129 R130 R125 R126 R127 R128

TP700

TP701

6D/7D

4-7D

TP702

TP703

6D/4-7D

6D/7D/4-7D

TP196

SDCLK0

SDCLK1

3-3C

SDCLK2

3-3C

TP722

51 0

TP197

3-2D

33 33

ROMCSN0 ROMCSN1

IOWEN IORDN

SDCSN0 SDCSN1 SDCSN2

R79 R76

R73

4.7k

TP36

TP37

TP723

TP724

TP740 TP741 TP742 TP725 TP726 TP727

TP10

R92

TP11

@R95

TP12

R89

TP13

R91

TP14

R81

TP15

R85

TP16

R90

TP17

R75

TP26

R78

TP29

R67

TP30

R58

TP31

R70

TP32

R72

TP33

R68

TP198

R27

10k

R30

R31

R32

SDCKE0

SDCKE1

3-3C

4.7k

4.7k 0V

VDD3

SDSDA

3-2C

SDSCL

3-2C

10k

R51

R50

R52

R48

R49

R53

R33

R54

R62

ADR[1] ADR[2] ADR[3] ADR[4] ADR[5] ADR[6] ADR[7] ADR[8]

ADR[9] ADR[10] ADR[11] ADR[12] ADR[13] ADR[14] ADR[15] ADR[16] ADR[17] ADR[18] ADR[19] ADR[20] ADR[21] ADR[22] ADR[23]

10k

R60

R59

R61

ADR[23-1] 5F/6C/7F/3-2E/ 3-3D/4-6E/3-3C/ 7A/7B/3-2D

Fig. 3-3

Stores the data received from the PC into DRAM as controlled by the DMA controller. The transmission speed is 480Mbps or 12Mbps.

U15

Aurora

Fig. 3-4

3-3

Page 60

CHAPTER 3 THEORY OF OPERATION

1.3.3 IEEE1284

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

CDCC_D[7-0]

230

CDCC_D[0] CDCC_D[1] CDCC_D[2] CDCC_D[3] CDCC_D[4] CDCC_D[5] CDCC_D[6] CDCC_D[7]

CDCCINITN

229

CDCCSINN

228

CDCCHBUSY

227

CDCCSTBN

240

CDCC_D0

239

CDCC_D1

238

CDCC_D2

235

CDCC_D3

234

CDCC_D4

233

CDCC_D5

232

CDCC_D6

231

CDCC_D7

INITN SEINN HBUSY

STBN

CDCC_D[7-0]

5D 5D 5D 5D

1.3.4 ROM

CDCCACKN CDCCBUSY

CDCCPEN CDCCSLCT CDCCFLTN

Aurora

245 244 243 242 241

CDCC_D[0] CDCC_D[1] CDCC_D[2] CDCC_D[3] CDCC_D[4] CDCC_D[5] CDCC_D[6] CDCC_D[7]

INITN_IN

CDC-.cir/2B

SELINN_IN

CDC-.cir/2B

HBUSY_IN

CDC-.cir/2B

STBN_IN

CDC-.cir/2B

PC Printer Printer PC

CDCC_DIR

CDCC_HD

C101

C119

C118

U11 DIR HD

VCC_CABLE

GND

VCC_CABLE

A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13

C14 C15 C16 C17

PLHIN HLH 74LVX161284

Fig. 3-5

HLHIN

VCC

C135

GND

Y10

Y11

Y12

Y13

A14

A15

A16

A17

TP998

PLH

VDD3

C103

C121

VDD5

C120

C136

C103

D[0] D[1] D[2] D[3] D[4] D[5] D[6] D[7]

C101

C133

C132

HBUSY_IN SELINN_IN

INITN_IN STBN_IN

INITN

SEINN

HBUSY

STBN

C101

CDC-.cir/3A

C101

C130

CDC-.cir/1B CDC-.cir/1B CDC-.cir/1B CDC-.cir/1B

D[7-0]

C101

C129

C101

D[7-0]

C127

C124

C126

C123

TP118

R113

TP119

R115

TP120

R119

TP121

R131

TP122

D[0] D[1] D[2] D[3] D[4]

D[7-0]

D[5] D[6]

TP123

D[7]

CDC-.cir/3C

33 33 33 33

DA2

DA3

C3C1C2AC4

DF5A6.8FU

RA6

RA5

DA4

DA5

C3C1C2AC4

DF5A6.8FU

IF_FG

IF_FG2

VDD5

ZD1 UDZS6.8B

CN5

+5V

ACK

BUSY

SELECT

FLT

ATFEED

SELIN

INPRIM

STB

DI1

DI2

DI3

DI4

DI5

DI6

DI7

DI8

9 11 12 13 14 16 17

29 28 27 26

C101

TP999

C116

C115

Fig. 3-6

3-4

Page 61

1.3.5 Flash ROM

A 16Mbit flash ROM (x 16bit) is fitted.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

1.3.6 SDRAM

Fig. 3-7

Fig. 3-8

3-5

Page 62

CHAPTER 3 THEORY OF OPERATION

1.3.7 Optional RAM

A 32bit (100 pin) DIMM can be fitted as optional RAM. The main PCB has one slot and the capacity of DIMM can be from 16MB to 128MB.

DQ[31-0]

1-8C/7D/4-7E

SDSDA

1-5D

SDSCL

1-5D

DQ[0] DQ[1] DQ[2] DQ[3] DQ[4] DQ[5] DQ[6] DQ[7] DQ[8] DQ[9] DQ[10] DQ[11] DQ[12] DQ[13] DQ[14] DQ[15] DQ[16] DQ[17] DQ[18] DQ[19] DQ[20] DQ[21] DQ[22] DQ[23] DQ[24] DQ[25] DQ[26] DQ[27] DQ[28] DQ[29] DQ[30] DQ[31]

DIMM

CN4

DQ0

DQ1

DQ2

DQ3

DQ4

DQ5

DQ6

DQ7

DQ8

DQ9

DQ10

DQ11

DQ12

DQ13

DQ14

DQ15

DQ16

DQ17

DQ18

DQ19

DQ20

DQ21

DQ22

DQ23

DQ24

DQ25

DQ26

DQ27

DQ28

DQ29

DQ30

DQ31

SDA

SCL

SA0

SA1

100

SA2

1-5F/1-6A/1-6C/1-7A/1-7F/2E/4-6E 1-5F/1-6A/1-6C/1-7A/1-7F/2E/4-6E 1-5F/1-6A/1-6C/1-7A/1-7F/2E/4-6E

1-5F/1-6A/1-6C/1-7A/1-7F/2E/4-6E 1-5F/1-6A/1-6C/1-7A/1-7F/2E/4-6E

1-5F/1-6A/1-6C/1-7F/2E/4-6E 1-5F/1-6A/1-6C/1-7F/2E/4-6E

SDCKE1

ADR[17] ADR[18] ADR[19]

SDCLK1 SDCLK2

ADR[20] ADR[21] ADR[22] ADR[23]

1-5C

1-4C 1-4C

RASN CASN WEN

DQM0 DQM1 DQM2 DQM3

VDD3

CN4

VDD

VSS

CKE0/NotUse

CKE1/NotUse

NotUse/OE

RASN/NotUse

CASN/NotUse

WEN/WEN/NotUse

CK0/NotUse

CK1/NotUse

DQMB0/CASN0/NotUse

DQMB1/CASN1/NotUse

DQMB2/CASN2/NotUse

DQMB3/CASN3/NotUse

SDCSN1 SDCSN2

ADR[16]

1-5F/1-6A/ 1-6C/1-7B/ 1-7F/2E/4-6E

ADR[15] 1-5F/1-6A/

1-6C/1-7B/ 1-7F/2E/4-6E

ADR[23-1] 1-5F/1-6A/1-6C/ 1-7F/3D/4-6E/3C/ 1-7A/1-7B/2D

1-4C 1-4D

BA1

BA0

ADR[14] ADR[13] ADR[12] ADR[11] ADR[10] ADR[9] ADR[8] ADR[7] ADR[6] ADR[5] ADR[4] ADR[3] ADR[2]

SN0/RASN0/E0

SN1/RASN1/E1

SN2/RASN2/E2

SN3/RASN3/E3

BA1/A12

RFU

BA0/A11

A13/NotUse/A15

A12/NotUse/A14

A11/A13

A10,AP/A10

VDD3

C81

C79

C131

C117

C103 C103 C103 C103 C103 C103 C103 C103 C103

C114

C97

C98

RFU

NC[C80]

NC[C81]

NC[C82]

NC[C83]

NC[C84]

NC[C85]

NC[C86]

NC[C87]

VREF/Not Use

C47

C51

Fig. 3-9

3-6

Page 63

1.3.8 EEPROM

The EEPROM is BR24126 type of two-wire method with a 8192 x 8bit configuration.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

U15

1.3.9 Reset circuit

The reset IC is a R3112N281C. The reset voltage is 2.8V (typ.) and the LOW period of reset is

22.4ms (typ.)

1.3.10 Engine I/O

The interface with the engine PCB is by full-duplex synchronous serial method, of which transfer rate is 520kbps.

ENGDI

254

1.3.11 Panel I/O

ENGDI

ENGRSTN

ENGDO

Aurora

Fig. 3-10

VDD3

C71

C103

C75

C103

TP310

GND

R3112N281C

VOUT

VCC

TP4

C77

R84

C101

Fig. 3-11

VDD3

ENGINE

4.7k

R139

TP205

C102

R140

4.7k

L10

L14 L12 L13 L15

L11

VDD3

TP200

253 255

ENGDI

TP201

R142

R138

VDD5

TP202

TP203

100

C103

C152

C153

TP204

C101

C142

C101

R141 100

C154

C103

C143

Fig. 3-12

CN9

0 0 0 0

3.3V

RESET

TXD

RXD

B6B-PH-K-S

The interface with the panel PCB is by full-duplex synchronous serial method.

Fig. 3-13

3-7

Page 64

CHAPTER 3 THEORY OF OPERATION

1.3.12 Video I/O

The video signal output from the ASIC is reversed through a transistor and output after being corrected by the buffer IC.

VDD3

R21

C27

680

C471

TP230

TP232

R19 680

R12

VDON0

ENBN0

BDN

1.3.13 Scanner control

C21

C103

C22

C102

VDD3

R8 1k

220k

CN1

DATA1

GND

+5V

ENB1

VDD5

R15

1/10W

330

TP231

C3735

R16 680

TP233

1 2

B A TC7SH08FU

R10 0

VCC

GND

C18 C103

VDD5

VDD3

330

R151

1/10W

VDD5

TP234 TP235

C270

C20

R13 100

C101

C23

Fig. 3-14

Fig. 3-15

3-8

Page 65

1.3.14 Power supply

+5V is generated by the 3-pin regulator from astable 7V supplied from the LVPS. +5V is used for the IEEE1284 interface, the LD PCB and the engine PCB. In addition, +1.9V is generated by the 3-pin regulator from 3.3V supplied from the LVPS. +1.9V is used for the CPU within the ASIC and the logic circuit.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

C138

6.3V 6V C220

C22 16V

C157

VDD7

VDD3

C137

C104

C158

C104

GND

NJU7223DL1-19

RB751V-40

VCC

GND

VCC

OUT

NJM2391DL1-19

OT1

FG1

OUT

C151

C104

D1 RB751V-40

C128

C104

VDD1.8

C125

16V

C10

VDD5

C140

C10

16V

VDD7

VDD3

C141

6.3V 6V

C220

LVPS

CN8

B3B-EH

+7V

+3V

Fig. 3-16

3-9

Page 66

CHAPTER 3 THEORY OF OPERATION

1.4 Engine PCB

The gate array which transforms the serial signal from the main PCB into the parallel signal is mounted on the engine PCB.

The engine PCB controls the following parts by using the transferred signal data;

• Main motor

• Fan motor

• Thermistor

• Polygon motor • Upper paper exist sensor

• High-voltage power supply • Lower paper exist sensor

• Toner sensor • Lower cassette exist sensor

• Cover sensor • Paper eject sensor

• Front registration sensor • Fixing unit cover sensor

• Rear registration sensor • Multi-purpose tray paper exit sensor

For the circuit diagram of the engine PCB, see APPENDIX 4.8 and 4.9 ‘ENGINE PCB

CIRCUIT DIAGRAM’ in this manual.

• Solenoid

• Upper cassette sensor

• Lower cassette sensor

Sensor configuration varies according to machine types.

DCP-8020/MFC-8420 DCP-8025D/8025DN

MFC-8820D/8820DN

Upper cassette sensor Upper paper exit sensor Multi-purpose tray paper exit sensor DX sensor DX paper select sensor

: Built-in : Not built-in

3-10

Page 67

1.5 Power Supply

1.5.1 Low-voltage power supply

The power supply uses a switching regulation system to generate the regulated DC power (+3.3V, +8V [non regulated] and +24V), which are converted from the AC line.

The regulated output is listed below;

Regulated Output +3.3V / 1.5A

+8V / 0.4A +24V / 2.2A

For the circuit diagram of the low-voltage power supply PCB, see APPENDIX 4.15 or 4.16

‘LOW-VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM’ in this manual.

Fuse

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(Heater)

Thermal

Fuse

Lightning

Surge

Absorber

Line

Filter

Fuse

Rectifier

24V

Regulation

Circuit

Heater

Circuit

Lamp

Feedback

Oscillator

(Engin Circuit / Main Circuit)

24V

3.3V

Regulation

Circuit

3.3V

Fig. 3-17

3-11

Page 68

CHAPTER 3 THEORY OF OPERATION

1.5.2 High-voltage power supply

The high-voltage power supply generates and outputs the voltages and currents for the charging, development and transfer functions.

For the circuit diagram of the high-voltage power supply PCB, see APPENDIX 4.17 or 4.18

‘HIGH-VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM’ in this manual.

24VI

Current

Regulator

Voltage

Regulator

VR52

Current

Regulator

B201 Q205

Voltage

Regulator

B251 Q253

Supply Roller

Development

Roller

Transfer Roller

Cleaning Brush

Photosensitive

Drum

Corona

Unit

GND

VR251

Voltage

Regulator

Z101 VR101

Voltage

Regulator

VR102

Fig. 3-18

3-12

Page 69

2. MECHANICS

2.1 Overview of Printing Mechanism

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Second eject roller

Outer chute MP

Rear cover

First eject roller

FIXING UNIT

Pressure roller

DX feed ASSY

PAPER TRAY

Heat roller

Corona wire

Scanner motor

LASER UNIT

Blade

DRUM UNIT

Development roller

Supply roller Paper feed pinch roller

Regist front actuato

First feed pinch roller First feed roller

Paper pick-up roller

Pressure roller

Paper

Cleane

Photosensitive drum

Transfer rolle

Fig. 3-19

3-13

Regist rear actuator

Paper Feed roller

Pressure plate

Separation pad

Page 70

CHAPTER 3 THEORY OF OPERATION

2.2 Scanner Mechanism

LF roller 2 ASSY

DF cover

LF roller 1 ASSY

PF roller holder ASSY

Front sensor actuator ASSY

Eject roller ASSY

Guide shaft

Top cover

HP sensor

CCD module

Fig. 3-20

Scanner base

Belt

This scanner mechanism supports a dual scanning system. (1) If you set documents with their faces up on the document chute and start the scanning

operation, the ADF motor rotates so that the document feed roller ASSY feeds those documents into the ADF unit, starting from the top sheet to the bottom, page by page. Each then document curves downwards and turns to the right so as to advance above the CCD unit, and then it is fed out to the document tray with the document ejection roller ASSY.

This way, documents move above the CCD unit being kept in a stationary position.

(2) If you open the document cover, put a sheet of document (or put a bound book opened)

on the glass of the scanner top cover, close the document cover, and start the scanning operation, then the CCD drive mechanism will be driven. That is, the CCD motor rotates and its rotation will be transmitted via the gear train to the CCD drive belt.

The CCD unit, which is supported and guide by the CCD rail, is secured to the CCD drive belt. Clockwise and counterclockwise rotations of the CCD motor move the CCD unit to the right and left, respectively.

In this scanning system, the CCD unit moves horizontally beneath a document being kept in stationary position.

The CCD unit contains a charge coupled device (CCD) image sensor. The cold-cathode

florescent lamp illuminates a document and the reflected light of the scanned image data is transmitted via the mirrors into the lens which reduces the scanned data so as to form the image on the CCD.

Pulley ASSY

3-14

Page 71

2.3 Paper Transfer

2.3.1 Paper supply

The paper pick-up roller picks up one sheet of paper from the paper tray every time it is rotated and feeds it to the paper feed roller.

Paper feed pinch roller

Paper feed roller

Regist front

actuator

Paper pick-up roller

First feed roller

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

First feed pinch roller

The paper is gripped between the paper pick-up roller and the separation pad and separated into individual sheets.

The pick-up roller is directly connected to the clutch mechanism, whose rotation is stopped by the stopper arm. When the pick-up solenoid is activated, the clutch mechanism is engaged by the solenoid action and the paper pick-up roller is driven. The paper drawn out of the tray by the pick-up roller pushes against the regist front actuator and the paper top position/absence of paper is detected by sensing the motion of the actuator.

2.3.2 Paper registration

After the paper top position is detected by the regist front actuator, the paper, separated into individual sheets by the paper pick-up roller, is fed further for a specified time, and the paper top position reaches the paper feed roller so that the paper skew is adjusted. Then, the solenoid is turned off, the paper feed roller starts turning, and the paper is fed to the transfer block in the drum unit.

Photosensitive drum

Pressure plate

Paper feed roller

Fig. 3-21

Separation pad

Transfer roller

Regist rear actuato

Regist front actuato

Fig. 3-22

The regist rear actuator in the path from the feed roller to the transfer roller controls the first print position on the paper.

3-15

Page 72

CHAPTER 3 THEORY OF OPERATION

2.3.3 Paper eject

After the printing image on the photosensitive drum is transferred onto the paper, the paper is fed to the fixing unit to fix unfixed toner onto the paper.

Afterwards, the paper is ejected from the fixing unit by the first eject roller in the fixing unit. The paper eject actuator detects whether the paper is ejected correctly or not.

After the paper exits from the first eject roller, the paper is turned by the rear cover and ejected face down into the top output tray through the second eject roller. If the rear cover is open, the paper is ejected face up straight to the printer rear (straight paper path).

Rear cover

Second eject roller

Paper eject actuator

2.3.4 Duplex printing

After the paper exits from the second eject roller with the front of sheet printed, the second eject roller rotates conversely and feeds the paper to the duplex tray, where the paper skew is adjusted.

Afterwards, the paper is ejected from the duplex tray to the path through the paper feed roller and the transfer roller to the transfer block in the drum unit again for process of printing on the back of sheet.

Paper cover

Paper outer guide

Paper guide

First eject roller

Pressure roller

Second eject roller

Fig. 3-23

First eject roller

Heat roller

Photosensitive drum

Paper feed pinch roller

Duplex tray

Transfer roller

Rear registration sensor lever

Fig. 3-24

3-16

Paper feed roller

Front registration sensor lever

Page 73

2.4 Sensors

2.4.1 Cover sensors

Detect opening and closing of the front cover.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

2.4.2 Toner sensors

Detects if there is toner in the toner cartridge. The toner sensor at the left side emits light through the window on the left side of the toner cartridge, then the toner sensor at the right side receives it when the toner is low. They also detect whether or not the drum unit is installed. (The toner cartridge is installed in the drum unit.)

Fig. 3-24

Front cover sensor

Toner sensor (Light reception)

Toner sensor (Light emiss i on)

Fig. 3-25

3-17

Page 74

CHAPTER 3 THEORY OF OPERATION

2.4.3 Cassette sensor / Paper empty sensor

Detect if the paper tray is installed. They also detect if there is paper in the paper tray .

Cassette sensor PCB A SSY

2.4.4 Paper eject sensor

Detects if paper is ejected from the fixing unit.

Fixing unit

Fig. 3-26

Paper empty sensor

Cassette sensor

Eject sensor PCB ASSY

Fig. 3-27

3-18

Page 75

2.4.5 MP-PE sensor

Detects if there is paper in the MP tray.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

MP-PE sensor PCB ASSY

2.4.6 Document cover sensor

Document cover sensor

Feed MP unit

Fig. 3-28

Fig. 3-29

3-19

Page 76

CHAPTER 3 THEORY OF OPERATION

2.4.7 Document front sensor /Document rear sensor

Document front sens or

Document rear sensor

2.4.8 DX-sensor PCB ASSY

Fig. 3-30

DX-sensor PCB ASSY

Fig. 3-31

3-20

Page 77

2.4.9 Rear cover sensor

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Rear cover sensor

2.4.10 HP sensor

HP sensor

Fig. 3-32

Fig. 3-33

3-21

Page 78

CHAPTER 3 THEORY OF OPERATION

2.5 Drum Unit

2.5.1 Photosensitive drum

Generates the latent electrostatic image and develops the image on the drum surface.

2.5.2 Primary charger

Forms a uniform charge on the drum surface. (1) Corona wire

Generates the ion charge on the drum.

(2) Grid

Spreads the ion charge evenly over the drum surface.

2.5.3 Transfer roller

Transfers the toner image to the paper from the drum surface.

2.5.4 Cleaner

Removes the paper dust or dirt on the surface of the photosensitive drum.

2.6 Toner Cartridge

Develops the electrostatic latent image on the photosensitive drum with toner and forms the visible image.

2.7 Print Process

2.7.1 Charging

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

870V

Voltage regulator

---

luminum drum sleeve

Organic photoconductor layer

Grid

HVPS

Photosensitive drum

Corona wire

Fig. 3-34

The primary charge uses a corona wire, but since the drum is positively charged, only less than 1/10 of the usual quantity of ozone is generated compared with the negatively charged drum. The level of ozone expelled from the printer is therefore not harmful to the human body. Applicable safety standards have been complied with.

3-22

Page 79

2.7.2 Exposure stage

After the drum is positively charged, it is exposed to the light emitted from the laser unit.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Laser detecto

Surface potential (V)

Drum

Paper

Laser beam

f θ lens

Polygon mirror

Laser diode

Motor

Lens

Fig. 3-35

Laser beam

The area exposed to the laser beam is the image to be printed. The surface potential of the exposed area is reduced, forming the electrostatic image to be printed.

1 Cycle of drum

Primary charging

Laser beam exposure and developing

(a) Unexposed area

(Non image area)

+870

2 1 (a)

(b) Exposed area

(Image area)

Transfer the image to paper

Drum sleeve

+400

(b)

+150

Time

Fig. 3-36

3-23

Page 80

CHAPTER 3 THEORY OF OPERATION

2.7.3 Developing

Developing causes the toner to be attracted to the electrostatic image on the drum so as to transform it into a visible image.

The developer consists of a non-magnetic toner. The development roller is made of conductive rubber and the supply roller (which is also made of conductive sponge) rotate against each other. The toner is charged and carried from the supply roller to the development roller. The toner adheres to the development roller and is conveyed to the photosensitive drum at an even thickness controlled by the blade. The toner is nipped between the development roller and the drum and developed onto the latent image on the drum. The electrostatic field between the drum and the development roller, which is DC-biased from the high-voltage power supply, creates the electrostatic potential to attract toner particles from the development roller to the latent image area on the drum surface.

Corona wire

Development rolle

Photosensitive drum

2.7.4 Transfer

(1) Transfer process

After the drum has been charged and exposed, and has received a developed image, the toner formed is transferred onto the paper by applying a negative charge to the back of the paper. The negative charge applied to the paper causes the positively charged toner to leave the drum, and adhere to the paper. As a result, the image is visible on the paper.

Transfer rolle

Blade

Supply roller

Fig. 3-37

(2) Cleaning process of transfer roller

If the toner is not transferred onto the paper perfectly it is possible that there may be residual toner on the drum which will adhere to the transfer roller. The transfer voltage changes to a positive voltage during non-printing rotation of the drum. Therefore the transfer roller is cleaned by returning the positively charged toner adhering to the transfer roller onto the photo-conductive drum.

3-24

Page 81

2.7.5 Fixing stage

The image transferred to the paper by static electricity is fixed by heat and pressure when passing through the heat roller and the pressure roller in the fixing unit. The thermistor keeps the surface temperature of the heat roller constant by detecting the surface temperature of the heat roller and turning on or off the halogen heater lamp.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Thermistor

First eject roller

Fig. 3-38

Pressure roller

Heat roller

3-25

Page 82

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

1. SAFETY PRECAUTIONS

To avoid creating secondary problems by mishandling, follow the warnings and precautions below

during maintenance work.

WARNING

(1) Always turn off the power switch and unplug the power cord from the power outlet

before accessing any parts inside the printer.

(2) Some parts inside the printer are extremely hot immediately after the printer is

used. When opening the front cover or rear cover to access any parts inside the printer, never touch the red colored parts shown in the following figures.

CAUTION:

(1) Be careful not to lose screws, washers, or other parts removed. (2) Be sure to apply grease to the gears and applicable positions specified in this chapter. (3) When using soldering irons or other heat-generating tools, take care not to accidentally

damage parts such as wires, PCBs and covers.

(4) Before handling any PCBs, touch a metal portion of the equipment to discharge any static

electricity charge on your body, or the electronic parts or components may be damaged. (5) When transporting PCBs, be sure to wrap them in the correct protective packaging. (6) Be sure to replace self-tapping screws correctly, if removed. Unless otherwise specified,

tighten screws to the following torque values.

TAPTITE, BIND or CUP B M3: 0.7N  m M4: 0.8N  m

TAPTITE, CUP S M3: 0.8N  m

SCREW M3: 0.7N  m M4: 0.8N  m

(7) When connecting or disconnecting cable connectors, hold the connector body, not the

cables. If the connector has a lock, release the connector lock first to release it. (8) After a repair, check not only the repaired portion but also all connectors. Also check that

other related portions are functioning properly before operational checks.

4-1

Page 83

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

2. DISASSEMBLY FLOW

AC CORD

DRUM UNIT

PAPER TRAY

DX FEED ASSY

(MFC-8820D/8820DN, DCP-8025D/8025DN only)

ACCESS COVER/BATTERY

DRIVER PCB ACCESS COVER

(3.5 (1) and (2) are contained. )

ADF UNIT

DOCUMENT SCANNER

PANEL UNIT

REAR COVER C

(MFC-8420, DCP-8020 only)

REAR COVER MP ASSY / OUTER CHUTE MP ASSY

(MFC-8820D/8820DN, DCP-8025D/8025DN only)

OUTER CHUTE

(MFC-8420, DCP-8020 only)

REAR COVER L/R

MAIN PCB

NCU

(MFC-8420/8820D/8820DN)

FIXING UNIT

SIDE COVER L/R

JOINT COVER

REAR COVER SENSOR

LASER UNIT

BASE PLATE / LV INSULATION SHEET

DX-SENSOR PCB ASSY

(MFC-8820D/8820DN, DCP-8025D/8025DN only)

ENGINE PCB

HIGH-VOLTAGE PS PCB ASSY

LOW-VOLTAGE PS PCB ASSY

PAPER FEEDER

FRAME L / DRIVE UNIT

REVERSING RELEASE SOLENOID

(MFC-8820D/8820DN, DCP-8025D/8025DN only)

THERMISTOR ASSY

FRONT COVER ASSY

(MFC-8420, DCP-8020 only)

MP UNIT

(MFC-8820D/8820DN, DCP-8025D/8025DN only)

FAN MOTOR 60 UNIT LV / FAN MOTOR 60 UNIT

FRAME R

4-2

Page 84

3. DISASSEMBLY PROCEDURE

3.1 AC Cord

(1) Disconnect the AC cord from the machine.

Machine

C cord

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

3.2 Drum Unit

(1) Open the front cover and remove the drum unit.

Fig. 4-1

Drum unit

Front cover

Fig. 4-2

4-3

Page 85

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

3.3 Paper Tray

(1) Close the front cover and pull out the paper tray. (2) Remove the paper from the paper tray.

Front cover

Paper tray

Fig. 4-3

(3) Remove the pad holder and the separation pad spring from the paper tray.

Pad holder

Separation pad spring

Paper tray

Fig. 4-4

4-4

Page 86

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

NOTE: When replacing/re-assembling the pad holder ZL2 ASSY, remove the old grease and apply a

suitable amount of grease referring to the figure below;

Paper pick-up roller

Grease: Molykote PG-662

(4 mm dia.ball)

(4) Remove the four bind B M4x12 Taptite screws, and then remove the paper tray front

cover.

Paper tray

Fig. 4-5

Taptite, bind B M4x12

Hook

Taptite, bind B M4x12

Hook

Fig. 4-6

4-5

Paper tray front cover

Page 87

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

(5) Remove the two cup B M3x10 Taptite screws, and then remove the paper tray cover.

Paper tray

Taptite, cup B M3x10

Paper tray cover

Fig. 4-7

Taptite, cup B M3x10

(6) Remove the pressure roller holder.

Pressure roller holder

Paper tray

Fig. 4-8

4-6

Flat screwdriver

Page 88

(7) Remove the pressure roller collar. (8) Remove the pressure roller shaft.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Pressure roller shaft

Pressure roller collar

Pressure roller holder ASSY

Fig. 4-9

(9) Remove the scratch spongy holder ASSY from the pressure roller holder. (10) Remove the two scratch spongy springs. (11) Remove the scratch spongy from the scratch spongy holder ASSY.

Scratch spongy

Scratch spongy holder ASS Y

Scratch spongy springs

Pressure roller holder

Fig. 4-10

4-7

Page 89

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

(12) Remove the two cup M2.6x5 Taptite screws. (13) Release the lock lever, and then unhook the catches of the two side guide racks.

Side guide L

Taptite, cup M2.6x5

Side guide rack

Catches

Paper tray

Side guide rack

Side guide L

Lock lever

Fig. 4-11

(14) Remove the side guides right and left from the paper tray.

Side guide R

Side guide L

Paper tray

Fig. 4-12

4-8

Page 90

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(15) Unhook the two catches (A) of the pressure plate while pulling the plastic frame outwards,

then unhook the other two catches (B) of the plate while pulling the plastic frame outwards

to remove the pressure plate ASSY.

Catches (A)

Pressure plate ASSY

Paper tray

(16) Unhook the pressure plate spring from the plastic hook to remove the two pressure plate

Pressure plate spring

Catch (B)

Plastic frame

Fig. 4-13

springs.

Paper tray

Pressure plate spring

Fig. 4-14

4-9

Hook

Page 91

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

NOTE: When re-assembling the pressure plate ASSY, ensure that the paper indicator arm is under the

pressure plate.

CAUTION:

When unhooking the catches to remove the pressure plate, do not bend the pressure plate, gently ease the plastic cover. If the pressure plate is deformed, paper feeding problems may occur.

(17) Remove the herical extension spring. (18) Remove the lock lever.

Herical extension spring

Paper tray

Lock lever

Fig. 4-15

Paper tray

NOTE: When re-assembling the lock lever, insert it upwards from underneath the cassette and rotate

it until the two catches lock into place.

4-10

Page 92

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(19) Remove the cup B M3x8 Taptite screw, and then remove the side guide gear and the

friction spring. (20) Remove the two side guide racks.

Taptite, cup B M3x8

Side guide gear

Side guide rack

Friction spring

(21) Remove the paper indicator.

Fig. 4-16

Paper indicator

Paper tray

Fig. 4-17

4-11

Page 93

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

NOTE:

• When re-assembling the side guide racks, they should both be aligned so that the wide end

of the racks are in line with the inside edge of the paper guide release slots in the tray before refitting the spring and gear.

• When replacing/re-assembling the paper cassette, remove the old grease and apply a

suitable amount of grease onto both sides of the paper tray referring to the figure below;

Grease: Molykote PG-662

(2 mm dia. ball)

(22) Remove the pan B M3x8 Taptite screw, and then remove the tray lock lever. (23) Unhook the four hooks to remove the paper tray rear from the paper tray.

Paper tray

Fig. 4-18

Taptite, pan B M3x8

Tray lock lever

Grease: Molykote PG-662

(2 mm dia. ball)

Paper tray rear

Hook

Paper tray

Fig. 4-19

4-12

Hooks

Hook

Page 94

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

(24) Remove the paper rear guide.

Paper tray

Paper rear guide

Fig. 4-20

4-13

Page 95

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

3.4 DX Feed ASSY (MFC-8820D/8820DN, DCP-8025D/8025DN only)

(1) Remove the DX feed ASSY.

DX feed ASSY

Fig. 4-21

(2) Remove the four bind B M3x8 Taptite screws, and then remove the DX roller holder and

three pressure rollers. (3) Remove the three pressure roller springs.

Pressure roller springs

Taptite, bind B M3x8

Pressure rollers

Taptite, bind B M3x8

Pressure roller spring

DX roller holder

Pressure roller

Fig. 4-22

4-14

Tray feed ZL2

Page 96

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

NOTE: Set pressure roller, and assemble pressure roller spring after assembling DX roller holder.

Pressure roller spring

Pressure roller

Tray feed ZL2

Fig. 4-23

(4) Remove the two bind B M3x8 Taptite screws, and then remove the guide plate stopper. (5) Remove the two left guide spring 2.

Guide plate stopper

Left guide spring 2

Taptite, bind B M3x8

Guide plate stopper

Taptite, bind B M3x8

Left guide spring 2

Tray feed ZL2

Fig. 4-24

4-15

Left guide spring 2

Page 97

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

(6) Remove the side regist guide. (7) Remove the left guide plate ASSY and DX paper switch pull arm.

Side regist guide

Left guide plate ASSY

DX paper switch pull arm

Hooks

Tray feed ZL2

Fig. 4-25

(8) Remove the DX feed roller, drive gear 14, two side regist rollers, T-belt (S) and ground

wire. (9) Remove the guide actuator and T-belt (L).

Side regist rollers

Guide actuator

Ground wire

Tray feed ZL2

Fig. 4-26

T-belt (S)

T-belt (L)

DX feed roller

Drive gear 14

4-16

Page 98

3.5 Access Cover / Battery

(1) Remove the access cover. (2) Loosen the two access plate screws. (3) Remove the access plate.

ccess plate screw

ccess cover

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Hooks

ccess plate

Hooks

ccess plate

screw

Fig. 4-27

Hooks

(4) Disconnect the connector, and then remove the battery. (MFC-8420/8820D/8820DN only)

Main PCB

Battery

Fig. 4-28

4-17

Page 99

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

3.6 Driver PCB Access Cover

(1) Remove the bind B M4x12 Taptite screw, and then remove the driver PCB access cover.

Driver PCB access cover

Taptite, bind B M4x12

Fig. 4-29

4-18

Page 100

3.7 ADF Unit

(1) Remove the document tray ASSY.

MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN

SERVICE MANUAL

Hooks

Document tray ASS Y

Hooks

Fig. 4-30

(2) Disconnect the three connectors. (3) Remove the cup B M3x10 Taptite screw, and then remove the ground wire.

Driver PCB ASSY

Connector

Taptite, cup B M3x10

Ground wire

Connector

Fig. 4-31

4-19

Main PCB