CHAPTER 4 DISASSEMBLY/REASSEMBLY AND LUBRICATION
CONTENTS
4.1 DISASSEMBLY/REASSEMBLY......................................................................................4-1
Safety Precautions........................................................................................................4-1
Tightening Torque List......................................................................................................4-2
Preparation ...................................................................................................................4-4
How to Access the Object Component .........................................................................4-4
Disassembly Order Flow...............................................................................................4-5
4.1.1 ADF Cover and Document Guide Base ...............................................................4-6
4.1.2 ADF Components on the Upper ADF Chute ........................................................4-7
4.1.3 ADF Components on the Lower ADF Chute ......................................................4-12
4.1.4 Document Tray Open Sensor and Document Stopper ......................................4-17
4.1.5 Scanner Unit and Control Panel ASSY (Together with Document Tray) ...........4-18
4.1.6 Disassembly of the Control Panel ASSY............................................................4-25
4.1.7 Disassembly of the Scanner Unit .......................................................................4-26
4.1.8 Front Cover ........................................................................................................ 4-31
4.1.9 Relay PCB..........................................................................................................4-32
4.1.10 Scanner Mount ...................................................................................................4-33
4.1.11 Board Access Cover and Auto Sheet Feeder (ASF) .......................................... 4-34
4.1.12 Heat-fixing Unit, FU Lamp, and Paper Ejection Sensor Actuator....................... 4-40
4.1.13 Laser Unit and Toner Sensor PCB.....................................................................4-42
4.1.14 Main PCB ........................................................................................................... 4-43
4.1.15 Bottom Plate.......................................................................................................4-46
4.1.16 Low-voltage Power Supply PCB.........................................................................4-47
4.1.17 High-voltage Power Supply PCB........................................................................ 4-48
4.1.18 Main-Fan PCB, Duct, and Fan ........................................................................... 4-49
4.1.19 Power Supply Shield ..........................................................................................4-50
4.1.20 Speaker ..............................................................................................................4-51
4.1.21 Gear Drive Unit................................................................................................... 4-52
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