TABLE OF CONTENTS
iv
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-8840D/8840DN, DCP-8045D/8045DN 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-8440, DCP-8040 only)
...................................................................
4-36
3.11 Outer Chute (MFC-8440, DCP-8040 only)
.....................................................................
4-37
3.12 Rear Cover MP ASSY / Outer Chute MP ASSY
(MFC-8840D/8840DN, DCP-8045D/8045DN 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-8440, DCP-8040 only)
...........................................................
4-45
3.17 MP Unit (MFC-8840D/8840DN, DCP-8045D/8045DN only)
..........................................
4-46
3.18 Rear Cover Sensor
.........................................................................................................
4-51
3.19 NCU (MFC-8440/8840D/8840DN 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-8840D/8840DN, DCP-8045D/8045DN 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