Contents
Main
SERVICE MANUAL
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PREFACE
HOW THIS MANUAL IS ORGANIZED
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TABLE OF CONTENTS
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SAFETY PRECAUTIONS
To use the MFC safely
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CHOOSING A LOCATION
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CHAPTER 1 PARTS NAMES & FUNCTIONS
1.1 EQUIPMENT OUTLINE
Front view
Rear view
1.2 CONTROL PANEL
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1-4 Confidential
1.3 COMPONENTS
The equipment consists of the following major components:
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CHAPTER 2 SPECIFICATIONS
2.1 GENERAL
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2-8 Confidential
2.2 SPECIFICATIONS LIST
MFC7420/7820N (1/15)
2-9 Confidential
(2/15)
2-10 Confidential
(3/15)
2-11 Confidential
(4/15)
2-12 Confidential
(5/15)
2-13 Confidential
(6/15)
2-14 Confidential
(7/15)
2-15 Confidential
(8/15)
2-16 Confidential
DCP7010/7020/7025 (9/15)
2-17 Confidential
(10/15)
2-18 Confidential
(11/15)
2-19 Confidential
(12/15)
2-20 Confidential
(13/15)
2-21 Confidential
(14/15)
2-22 Confidential
(15/15)
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CHAPTER 3 THEORY OF OPERATION
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3-1
3.1 OVERVIEW
Control Section
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3-2
3.2 MECHANICAL COMPONENTS
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3-3
3.2.1 Scanner Mechanism
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3-6
3.2.2 Printing Mechanism 3.2.2.1 Paper supply
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3-12
3.2.2.6 Toner cartridge
Printable pages
12,000
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3-15
3.2.2.7 Print process
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Charging
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Developing
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3-18
3.2.3 Sensors and Actuators
Sensor name Sensor type Location
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4.1 TRANSFERRING RECEIVED FAX DATA
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CHAPTER 5 DIS ASSEMBLY/REASSEMBLY AND LUBRIC ATION
5.1 DISASSEMBLY/REASSEMBLY
Main frame L Taptite, bind B M4x12 2 0.78 0.1 (8 1) Main fram e R
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5-4
Disassembly Flowchart
33
(1) Disconnect AC cord from the machine.
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5-6
5.1.3 Paper Tray
(1) Close the front cover and pull out the paper tray. (2) Remove the paper from the paper tray.
(3) Remove the separation pad holder ASSY and the separation pad spring.
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(1) Remove the rear chute cover.
(2) Remove the paper eject actuator and the eject actuator spring.
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5-9
5.1.6 Side Cover L
(1) Remove the two bind B M4x12 taptite screws, and then remove the side cover R.
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5-14
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5-15
(16) Remove the separation rubber ASSY from the upper document chute.
(17) Remove the separation rubber from the ADF plate spring.
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5-16
(20) Release the hook on the ADF unit and remove the ejection roller ASSY.
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(32) Remove the document front actuator from the lower document chute.
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5-22
(41) Remove the two springs. (42) Remove the pressure roller ASSY.
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5-25
5.1.9 Pull Arm/Pull Arm Guide/Lock Claw Pull Arm Spring
(3) Remove the pull arm springs and remove the pull arms (R, L) from the pull arm guides.
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5-26
5.1.10 Scanner Unit
(1) Disconnect the flat cable from the main PCB. (2) Remove the scanner unit from the machine.
5.1.11 Panel Unit
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5-27
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5-28
(8) Release the two hooks A to remove the backlight guide.
(9) Remove the diffusion film.
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5-30
5.1.12 NCU PCB
(1) Disconnect the connector of the speaker from the main PCB.
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5-32
(2) Release the three hooks to remove the speaker cover.
(3) Release the one hook to remove the speaker hold spring.
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5-33
(4) Remove the speaker ASSY.
(1) Remove the bind B M4x12 taptite screw, and then remove the rear cover stopper.
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(4) Remove the battery ASSY and disconnect the connector.
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5-36
(1) Release the hook of the drive release cam from the front cover ASSY.
(4) Remove the paper stopper L.
(5) Remove the paper stopper S from the paper stopper L.
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5-39
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5-41
NOTE: Be sure not to touch the pressure roller.
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5-43
(5) Remove the two PR arm ASSY and two PR bush from the pressure roller.
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(10) Remove the HR gear. (11) Remove the two HR bush.
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5.1.18 High-Volt ag e PS PCB ASSY
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5-49
(1) Disconnect the thirteen connectors from the main PCB.
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5-50
< MFC7820N >
(1) Disconnect the thirteen connectors from the main PCB.
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5-51
5.1.20 PS PCB Unit
(7) Remove the LV insulation sheet.
(10) Remove the two flat S M3x8, taptite screws, and then remove the inlet harness ASSY.
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5-59
5.1.26 Regist Sensor PCB ASSY
5.1.27 Regist Rear Actuator/Regist Rear Spring
(1) Remove the regist rear spring. (2) Remove the regist rear actuator.
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5-61
5.1.29 Toner LED PCB ASSY/LED Holder
(1) Remove the toner LED PCB ASSY from the main frame R.
(2) Remove the LED holder from the toner LED PCB ASSY.
5.1.31 New Toner Sensor
(1) Release the two hooks and remove the new toner sensor from the main frame L.
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5-63
(1) Release the two hooks and remove the cover sensor from the main frame L.
(1) Remove the cup B M3x6, taptite screw, and then remove the toner sensor PCB ASSY.
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5-64
(3) Remove the three cup S M3x6, taptite screws, and then remove the main motor ASSY.
(1) Remove the develop joint from the gear plate calking ASSY.
(1) Remove the gear ASSY from the main frame L.
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(1) Remove the two bind B M4x12, taptite screws, and then remove the main frame L.
(1) Remove the three bind B M4x12, taptite screws, and then remove the main frame R.
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5-70
5.1.40 Harness Routing
Laser unit
FG harness ASSY 1 / FG harness ASSY 5
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5-71
FG harness ASSY 6
Regist sensor PCB ASSY
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5-72
Fan motor 60 unit
Toner LED PCB ASSY
Toner sensor PCB ASSY
P/R solenoid ASSY / F/R solenoid ASSY
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5-75
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ADF unit
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NCU PCB
NCU FG harness
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5.2 LUBRICATION
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CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS, REQUIRED AFTER PARTS REPLACEMENT
CONTENTS
6.1 IF YOU REPLACE THE MAIN PCB
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CHAPTER 8 MAINTENANCE MODE
CONTENTS
8.1 ENTRY INTO THE MAINTENANCE MODE
8.2 LIST OF MAINTENANCE-MODE FUNCTIONS
8.3 USER-ACCESS TO THE MAINTENANCE MODE
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8.4 DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS
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+- +-+-
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CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING
9.1 ERROR INDICATION
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9.2 TROUBLESHOOTING
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9-27
[ 4 ] Image defects
1-1 Light 1-2 Dark 1-3 Completely blank 1-4 All black 1-5 Dirt on the back of paper
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I-3 Completely blank
Laser scanner unit assy
Interlock lever
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I-5 Dirt on the back of paper
I-6 Black and blurred vertical streaks
I-7 Black and blurred horizontal stripes
I-9 White vertical streaks
I-11 Faulty registration
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I-13 Image distortion
Yes Replace the laser unit.
Possible cause Step Check Result Remedy Laser unit installation
1 Is the laser unit secured to the frame incorrectly? (Check if there is any play.)
I-15 White spots
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9-40
(2) Turn the drum gear by hand while looking at the surface of the exposure drum.
I-16 Black spots
I-17 Black band
I-18 Gray background
I-19 Hollow print
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I-23 Ghost
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SERIAL NUMBERING SYSTEM
(2) Laser unit serial label
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A2.1 INSTALLING THE UPDATE DATA TO THE MACHINE
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A2.2 SETTING ID CODES TO MACHINES
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EEPROM CUSTOMIZING CODES
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