Brother MFC-8220 Service Manual page 5

TABLE OF CONTENTS
2.5 Drum Unit ....................................................................................................................... 3-20
2.5.1 Photosensitive drum..........................................................................................................3-20
2.5.2 Primary charger.................................................................................................................3-20
2.5.3 Transfer roller ....................................................................................................................3-20
2.5.4 Cleaner..............................................................................................................................3-20
2.6 Toner Cartridge .............................................................................................................. 3-20
2.7 Print Process .................................................................................................................. 3-20
2.7.1 Charging............................................................................................................................3-20
2.7.2 Exposure stage .................................................................................................................3-21
2.7.3 Developing ........................................................................................................................3-22
2.7.4 Transfer .............................................................................................................................3-22
2.7.5 Fixing stage .......................................................................................................................3-23
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 Power Cord....................................................................................................................... 4-3
3.2 Drum Unit ......................................................................................................................... 4-3
3.3 Paper Tray........................................................................................................................ 4-4
3.4 Rear Cover C.................................................................................................................. 4-13
3.5 Access Cover / Battery ASSY......................................................................................... 4-14
3.6 Control Panel ASSY ....................................................................................................... 4-16
3.7 Document Scanner......................................................................................................... 4-21
3.8 Outer Chute .................................................................................................................... 4-26
3.9 Rear Cover L/R............................................................................................................... 4-27
3.10 Side Cover L/R ............................................................................................................... 4-28
3.11 Top Cover ASSY ............................................................................................................ 4-29
3.12 Front Cover ASSY .......................................................................................................... 4-33
3.13 NCU................................................................................................................................ 4-34
3.14 Fixing Unit....................................................................................................................... 4-35
3.15 Laser Unit ....................................................................................................................... 4-44
3.16 Main PCB ASSY ............................................................................................................. 4-45
3.17 Base Plate / LV Insulation Sheet .................................................................................... 4-47
3.18 Engine PCB ASSY.......................................................................................................... 4-48
3.19 High-voltage PS PCB ASSY........................................................................................... 4-49
3.20 Low-voltage PS PCB ASSY............................................................................................ 4-49
3.21 Paper Feeder.................................................................................................................. 4-51
3.22 Frame L / Drive Unit ....................................................................................................... 4-58
3.23 Thermistor ASSY............................................................................................................ 4-62
3.24 Fan Motor 60 Unit LV / Fan Motor 60 Unit...................................................................... 4-62
3.25 Frame R.......................................................................................................................... 4-63
4. PACKING.............................................................................................................. 4-65
5. GUIDELINES FOR LEAD FREE SOLDER............................................................ 4-66
6. SCREW TORQUE LIST........................................................................................ 4-69
7. LUBRICATION...................................................................................................... 4-70
8. HARNESS ROUTING ........................................................................................... 4-71
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