Brother DCP 8040 - B/W Laser - All-in-One Service Manual page 6

TABLE OF CONTENTS
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
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