Brother MFC-J3520 MFC-J3720 MFC-J6520DW MFC-J6720DW MFC-J6920DW MFC-J6925DW Service Manual

Service Manual Brother MFC-J3520 MFC-J3720 MFC-J6520DW MFC-J6720DW MFC-J6920DW MFC-J6925DW;
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To see what contain, please read table of contents:

REGULATION
SAFETY INFORMATION

CHAPTER 1. SPECIFICATIONS
1 GENERAL
1.1 General
1.2 Media Specification
1.3 Paper Handling
1.4 LCD Panel
1.5 Memory
1.6 Interface
1.7 Others
2 FAX
3 PRINTER
4 COPY
5 SCANNER
6 SOFTWARE
7 NETWORK
7.1 Network
7.2 Wired
7.3 Wireless
8 SUPPRIES/OPTIONS
9 SERVICE INFORMATION
10 PAPER
10.1 Paper
10.2 Printable Area

CHAPTER 2. TROUBLESHOOTING
1 INTRODUCTION
1.1 See “Precautions for Troubleshooting and/or Disassembly/Assembly”
at the end of SAFETY INFORMATION
1.2 Initial Check
2 OVERVIEW
2.1 Cross-section Drawings
2.1.1 Document scanning
2.1.2 Printer part
2.2 Document Feeding Path/Recording Paper Feeding Path
2.2.1 Document Feeding Path
2.2.2 Recording Paper Feeding Path
2.3 Parts Names and Functions
2.4 Block Diagram
2.5 Components
3 ERROR INDICATION
3.1 Error Code
3.2 Error Messages
3.3 Communications Error
4 TROUBLESHOOTING
4.1 Error Cause and Solutions
4.2 Recording Paper Feeding Problems
4.2.1 Paper is not fed from paper tray
4.2.2 Paper is not fed from manual feed slot
4.2.3 Two or more sheets of paper fed at a time
4.2.4 Paper feeding at an angle
4.2.5 Recording paper jam
4.2.6 Prints only single side of the paper when duplex-printing
4.3 Print-image Problems
4.3.1 Defective images
4.3.2 Print-image problems
4.4 Software-related Problems
4.4.1 Cannot print data
4.5 Network Problems
4.5.1 Cannot make a print through network connection
4.6 Control Panel Problems
4.6.1 No display on LCD
4.6.2 No display on LED
4.6.3 The control panel does not work
4.6.4 Touch panel inoperative
4.7 Document Feeding Problems
4.7.1 Document can not be fed
4.7.2 Document double feeding
4.7.3 Document jam
4.7.4 Wrinkles on documents
4.7.5 Document size not correctly detected
4.8 Scanned-image Problems
4.8.1 Defective images
4.8.2 Troubleshooting from image defect
4.9 Fax Problems
4.9.1 No faxes can be sent
4.9.2 No faxes can be received
4.9.3 A communications error occurs
4.10 Other Problems
4.10.1 The machine cannot be powered ON
4.10.2 Memory card/PictBridge does not function (no response)
4.10.3 Data of memory card/PictBridge does not read
4.10.4 Internal memory errors
4.10.5 Security Function Lock related problems
4.10.6 Ink cartridge related problems
4.10.7 Loud printing sound

CHAPTER 3. DISASSEMBLY AND ASSEMBLY
1 PRECAUTIONS BEFORE PROCEEDING
2 PACKING
3 SCREW CATALOGUE
4 SCREW TORQUE LIST
5 LUBRICATION
6 OVERVIEW OF GEARS
7 ROUTING OF HARNESSES AND INK SUPPLY TUBES
8 DISASSEMBLY FLOW
9 DISASSEMBLY PROCEDURE
9.1 Preparation
9.2 Head Joint Rubber, Head/carriage Unit and CR Timing Belt
9.3 Ink Absorber Box
9.4 FB Hinge
9.5 Manual Feed Slot Cover ASSY
9.6 Document Scanner Side Cover L
9.7 Document Scanner Side Cover R
9.8 ADF Unit, Document Scanner Unit and ADF Hinge
9.9 ADF Document Support
9.10 ADF Cover ASSY and ADF Cover Side Cover
9.11 ADF Front Cover
9.12 ADF Side Cover L
9.13 ADF Side Cover R
9.14 ADF Back Cover
9.15 Document Separation Roller ASSY
9.16 ADF Separation Pad
9.17 Second Side CIS Unit
9.18 Second Side CIS Flat Cable
9.19 First Side Document Scanning Position Sensor PCB and
Second Side Document Scanning Position Sensor PCB
(Duplex Scanning Models Only)
9.20 Document Detection Sensor/Document Width Sensor PCB
9.21 First Side CIS Unit
9.22 First Side CIS Flat Cable and FFC Film
9.23 Front Cover L
9.24 Inner Media Cover
9.25 Panel ASSY
9.26 LCD PCB ASSY
9.27 LCD
9.28 Touch Panel ASSY
9.29 NFC PCB
9.30 Ink Cartridge Cover
9.31 Lower Side Cover L
9.32 Lower Side Cover R
9.33 Upper Side Cover L
9.34 Upper Side Cover R
9.35 Side Cover L and Side Cover R
9.36 Upper Cover
9.37 Wireless LAN PCB ASSY
9.38 Document Scanner Sensor PCB
9.39 Main PCB ASSY
9.40 MJ PCB ASSY
9.41 Jam Clear Cover
9.42 T1 Bank ASSY
9.43 Power Supply PCB ASSY
9.44 Carriage PCB ASSY
9.45 Ink Refill ASSY
9.46 Ink Absorber Felt (for Ink Refill ASSY)
9.47 Ink Cartridge Cover Sensor ASSY
9.48 CR Encoder Strip
9.49 Encoder Strip Guard Film
9.50 Switchback Sensor PCB
9.51 Carriage Motor ASSY
9.52 Flushing Base
9.53 Flushing Box
9.54 Platen Foam and Switchback Roller
9.55 PF Encoder Disk and PF Encoder Sensor PCB ASSY
9.56 Paper Feed Motor
9.57 Paper Feed Roller
9.58 Paper Ejection Roller and Platen
9.59 Maintenance Unit and Ink Absorber Felt (for Maintenance Unit)
9.60 Inner Chute ASSY
9.61 Registration Sensor PCB ASSY
9.62 T1 Paper Pull-in Roller
9.63 T2 Bank ASSY
9.64 T2 Paper Pull-in Roller
9.65 Base Pad

CHAPTER 4. ADJUSTMENTS AND UPDATING OF SETTINGS,
REQUIRED AFTER PARTS REPLACEMENT
1 IF YOU REPLACE THE MAIN PCB ASSY
1.1 Customize destinations (Maintenance mode 74)
1.2 Set the CIS type (Maintenance mode 59)
1.3 Install the firmware (Maintenance mode 28)
1.4 Initialize the EEPROM parameters (Maintenance mode 01)
1.5 Restore the head calibration data (Maintenance mode 68)
1.6 Set the serial number (Maintenance mode 80)
1.7 Update the head property data (Maintenance mode 68)
1.8 Restore machine information (Maintenance mode 46)
1.9 Adjust the touch panel (Maintenance mode 78)
1.10 Acquisition of white/black level data (Maintenance mode 55)
1.11 Adjustment of vertical print lines/software correction for inclination/
corrugation/ruled lines (Maintenance mode 65)4
1.12 Update the paper feeding correction values (Maintenance mode 58)
1.13 Adjust margins in borderless printing (Maintenance mode 66)
1.14 Reset purge and flushing counts
1.15 Write head calibration data (Maintenance mode 02)
1.16 Check scanning and printing
2 IF YOU REPLACE THE HEAD/CARRIAGE UNIT
2.1 Update the head property data (Maintenance mode 68)
2.2 Perform ink supply purge (Maintenance mode 76)
2.3 Check head nozzles (Maintenance mode 09)
2.4 Adjust head inclination
2.5 Adjustment of vertical print lines/software correction for inclination/
corrugation/ruled lines (Maintenance mode 65)
2.6 Update paper feeding correction values (Maintenance mode 58)
2.7 Adjust margins in borderless printing (Maintenance mode 66)
2.8 Write head calibration data (Maintenance mode 02)
2.9 Check scanning and printing
2.10 Obtain machine information at the user site (Instruction to the end user)
3 IF YOU REPLACE THE DOCUMENT SCANNER UNIT, ADF UNIT OR CIS UNIT
3.1 Set the CIS type (Maintenance mode 59) (Not required
after replacement of the ADF unit on simplex scanning models)
3.2 Acquisition of white/black level data (Maintenance mode 55) (Not required
after replacement of the ADF unit on simplex scanning models)
3.3 Check scanning
4 IF YOU REPLACE THE CONTROL PANEL ASSY, TOUCH PANEL,
LCD UNIT OR LCD PCB ASSY
4.1 Adjust the touch panel (Maintenance mode 78)
(Not required after replacement of the LCD unit)
4.2 Check LCD operation (Maintenance mode 12)
(Not required after replacement of the touch panel)
4.3 Check the operation of the control panel keys (Maintenance mode 13)
(Not required after replacement of the touch panel or LCD unit)
5 IF YOU REPLACE THE INK ABSORBER BOX OR FLUSHING BOX
5.1 Reset purge and flushing counts
6 IF YOU REPLACE THE PAPER FEEDING RELATED PARTS and
MAINTENANCE UNIT
6.1 Check head nozzles (Maintenance mode 09)
6.2 Adjustment of vertical print lines/software correction for inclination/
corrugation/ruled lines (Maintenance mode 65)
6.3 Update paper feeding correction values (Maintenance mode 58)
6.4 Adjust margins in borderless printing (Maintenance mode 66)
6.5 Check printing

CHAPTER 5. SERVICE FUNCTIONS
1 MAINTENANCE MODE
1.1 Entry to the Maintenance Mode
1.1.1 How to Enter the Maintenance Mode Exclusive to Service Personnel
1.1.2 How to Enter the End User-accessible Maintenance Mode
1.2 List of Maintenance-mode Functions
1.3 Detailed Description of Maintenance-mode Functions
1.3.1 EEPROM Parameter Initialization (Maintenance mode 01, 91)
1.3.2 Creating of Head Calibration Data and Writing it into Flash ROM
(Maintenance mode 02)
1.3.3 Printout of Scanning Compensation White/Black Level Data
(Maintenance mode 05)
1.3.4 ADF Performance Test (Maintenance mode 08)
1.3.5 Printout of Test Pattern (Maintenance mode 09)
1.3.6 Worker Switch Setting and Printout (Maintenance modes 10 and 11)
1.3.7 Operational Check of LCD (Maintenance mode 12)
1.3.8 Operational Check of Keys on Control Panel (Maintenance mode 13)
1.3.9 EEPROM Dump Transfer and Log Information Saving
(Maintenance mode 17)
1.3.10 Updating of Firmware Using an External Memory
(Maintenance mode 28)
1.3.11 Sensor Operational Check (Maintenance mode 32)
1.3.12 Printout of Dial Log (Maintenance mode 37)
1.3.13 Backup of Machine Information (Maintenance mode 46)
1.3.14 Setting of Country/Language (Maintenance mode 52)
1.3.15 Transfer of Received FAX Data and/or Equipment’s Log
(Maintenance mode 53)
1.3.16 Fine Adjustment of Scanning Position (Maintenance mode 54)
1.3.17 Acquisition of White/Black Level Data and CIS Scanner Area Setting
(Maintenance mode 55)
1.3.18 Cartridge IC Communication Check (Maintenance mode 57)
1.3.19 Updating of Paper Feeding Correction Values (Maintenance mode 58)
1.3.20 Checking of CIS Travel and Specifying of CIS Type
(Maintenance mode 59)
1.3.21 Printout of PRN/JPEG Files in Memory Card (Maintenance mode 61)
1.3.22 Move of the Head/Carriage Unit to the Adjustment Position
(Maintenance mode 63)
1.3.23 Adjustment of Vertical Print Lines/Software Correction for Inclination/
Corrugation/Ruled Lines (Maintenance mode 65)
1.3.24 Margin Adjustment in Borderless Printing (Maintenance mode 66)
Confidential
1.3.25 Updating of Head Property Data and Backup/Restoration of
Head Calibration Data (Maintenance mode 68)
1.3.26 Traveling Speed Check of Head/Carriage Unit (Maintenance mode 69)
1.3.27 Customizing Destinations (Maintenance mode 74)
1.3.28 Move of the Head/Carriage Unit to the Center (Maintenance mode 75)
1.3.29 Purge Operation (Maintenance mode 76)
1.3.30 Print of the Maintenance Information (Maintenance mode 77)
1.3.31 Adjustment of Touch Panel (Maintenance mode 78)
1.3.32 Display of the Equipment’s Log (Maintenance mode 80)
1.3.33 Equipment Error Code Indication (Maintenance mode 82)
1.3.34 Output of Transmission Log to the Telephone Line
(Maintenance mode 87)
1.3.35 Assurance Mode Switch Setting (Maintenance mode 88)
2 OTHER SERVICE FUNCTIONS
2.1 Displaying the Firmware Version
2.2 Moving the Head/Carriage Unit
2.3 Retrieving the Equipment Log Information

CHAPTER 6. CIRCUIT DIAGRAMS AND WIRING DIAGRAMS

CHAPTER 7 PERIODICAL MAINTENANCE
1. PERIODICAL REPLACEMENT PARTS
APPENDIX 1 SERIAL NUMBERING SYSTEM
APPENDIX 2 DELETION OF USER SETTING INFORMATION

A2.1 DELETING USER SETTING INFO FROM THE MACHINE
APPENDIX 3 INSTALLING THE MAINTENANCE PRINTER DRIVER

mfc MFCJ3520 MFCJ3720 MFCJ6520DW MFCJ6720DW MFCJ6920DW MFCJ6925DW