Brother MFC-9840CDW - Page 6

iv Confidential
CHAPTER 3 DISASSEMBLY AND ASSEMBLY ..................................... 3-1
1. SAFETY PRECAUTIONS ........................................................................................... 3-1
2. PACKING.................................................................................................................... 3-2
3. SCREW TORQUE LIST.............................................................................................. 3-3
4. LUBRICATION............................................................................................................ 3-7
5. OVERVIEW OF GEARS ........................................................................................... 3-15
6. HARNESS ROUTING ............................................................................................... 3-20
7. DISASSEMBLY FLOW ............................................................................................. 3-34
8. DISASSEMBLY PROCEDURE................................................................................. 3-35
8.1 Paper Tray ........................................................................................................................3-35
8.2 DX Feed ASSY .................................................................................................................3-37
8.3 MP Cover ASSY/ MP Paper Guide ASSY........................................................................3-37
8.4 MP Lift Arm 2/ MP Roller Holder ASSY............................................................................3-40
8.5 Fuser Unit/ Toner Filter Frame ASSY...............................................................................3-43
8.6 Back Cover Upper ............................................................................................................3-45
8.7 Paper Eject ASSY DX.......................................................................................................3-46
8.8 Back Cover ASSY.............................................................................................................3-48
8.9 Paper Guide/ HV TR Top Cover.......................................................................................3-49
8.10 Transfer HVPS PCB Unit................................................................................................3-50
8.11 Registration-mark Sensor PCB ASSY 1, 2/ Density Sensor/ Registration Relay PCB
ASSY/ Transfer HVPS PCB ASSY.................................................................................3-51
8.12 Side Cover L ASSY ........................................................................................................3-57
8.13 Side Plate LB ..................................................................................................................3-58
8.14 Drum Unit Fan (OPC) .....................................................................................................3-59
8.15 Side Cover R ASSY........................................................................................................3-60
8.16 Paper Stopper.................................................................................................................3-61
8.17 Driver PCB ASSY ...........................................................................................................3-62
8.18 Pull arm L, R/ Hinge Protection Cover ASSY.................................................................3-64
8.19 ADF Unit .........................................................................................................................3-68
8.20 Panel Unit .....................................................................................................................3-102
8.21 Document Scanner Unit ...............................................................................................3-107
8.22 NCU PCB ASSY (MFC-9840CDW only) ......................................................................3-117
8.23 Battery ASSY................................................................................................................3-120
8.24 Joint Cover ASSY .........................................................................................................3-121
8.25 Speaker ASSY..............................................................................................................3-127
8.26 Roller Holder ASSY ......................................................................................................3-129
8.27 Paper Feed Frame Unit/ T1 PE/Edge Sensor PCB ASSY ...........................................3-130
8.28 Belt Cleaner Release Sensor PCB ASSY ....................................................................3-138
8.29 THM/HUM Sensor Holder ASSY ..................................................................................3-139
8.30 Release Rack ...............................................................................................................3-141