Brother MFC-8220 Service Manual page 6

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.......................................................................................................... 4-34
3.13 NCU ............................................................................................................................... 4-35
3.14 Fixing Unit ...................................................................................................................... 4-36
3.15 Laser Unit....................................................................................................................... 4-45
3.16 Main PCB ASSY ............................................................................................................ 4-46
3.17 Base Plate / LV Insulation Sheet ................................................................................... 4-48
3.18 Engine PCB ASSY ......................................................................................................... 4-49
3.19 High-voltage PS PCB ASSY .......................................................................................... 4-50
3.20 Low-voltage PS PCB ASSY........................................................................................... 4-50
3.21 Paper Feeder ................................................................................................................. 4-52
3.22 Frame L / Drive Unit....................................................................................................... 4-59
3.23 Thermistor ASSY ........................................................................................................... 4-63
3.24 Fan Motor 60 Unit LV / Fan Motor 60 Unit..................................................................... 4-63
3.25 Frame R ......................................................................................................................... 4-64
4. PACKING ................................................................................................................4-66
5. GUIDELINES FOR LEAD FREE SOLDER..............................................................4-67
6. SCREW TORQUE LIST ..........................................................................................4-70
7. LUBRICATION ........................................................................................................4-71
8. HARNESS ROUTING..............................................................................................4-73
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