Brother HL-3450CN Service Manual page 209

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY
CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY................................ 7-4
1. BEFORE STARTING DISASSEMBLY.............................................................. 7-4
1.1 Precautions .............................................................................................................................. 7-4
1.2 Preparation of Disassembly ..................................................................................................... 7-4
2 PARTS NAME.................................................................................................... 7-6
2.1 Cover ....................................................................................................................................... 7-6
2.2 Circuit Boards (PWBs) ............................................................................................................. 7-7
2.3 Motor Units............................................................................................................................... 7-7
2.4 Clutches ................................................................................................................................... 7-8
2.5 Sensors.................................................................................................................................... 7-8
3. DISASSEMBLY FLOW ..................................................................................... 7-9
4. DISASSEMBLY PROCEDURE....................................................................... 7-10
4.1 Right Side of the Printer......................................................................................................... 7-10
4.1.1 Side cover 3 (R) .............................................................................................................. 7-10
4.1.2 Base cover 3 (R) ............................................................................................................. 7-11
4.1.3 Main motor 3 (MM) .......................................................................................................... 7-12
4.1.4 Developer drive motor 3 (DM) ......................................................................................... 7-13
4.1.5 IOD2 PWB....................................................................................................................... 7-14
4.1.6 Registration clutch........................................................................................................... 7-15
4.1.7 TR cam clutch 3 .............................................................................................................. 7-15
4.1.8 Cleaner clutch 3 / Cleaner cam clutch 3 / Fuser clutch 3................................................ 7-16
4.1.9 Ozone fan (OZFAN) (Cooling fan (OZ)) .......................................................................... 7-17
4.1.10 BD3 gear assembly ....................................................................................................... 7-18
4.1.11 Main gear unit 3............................................................................................................. 7-18
4.1.12 Paper feeding clutch / EP3 gear assembly ................................................................... 7-19
4.1.13 WT holder assembly...................................................................................................... 7-19
4.1.14 Developer drive unit 3 ................................................................................................... 7-20
4.1.15 Developer clutch 3 (K, Y, M, C)..................................................................................... 7-21
4.1.16 Toner sensor (TPD) ...................................................................................................... 7-21
4.1.17 Waste toner feeder (L) .................................................................................................. 7-22
4.2 Top of the Printer ................................................................................................................... 7-23
4.2.1 Upper side cover (LU) (Upper side cover 3 (L)) .............................................................. 7-23
4.2.2 Panel PWB (including LCD) ............................................................................................ 7-24
4.2.3 Side cover 3 (L) ............................................................................................................... 7-24
4.2.4 Base cover 3 (L) .............................................................................................................. 7-25
4.2.5 Upper cover (Top cover 3) .............................................................................................. 7-26
4.2.6 Side cover (LF) (Side front cover 3 (L))........................................................................... 7-26
4.2.7 IOD1 PWB....................................................................................................................... 7-27
4.2.8 Control fan (CTFAN) (Cooling fan (PS))/ Interlock switch (Top) ..................................... 7-27
4.2.9 Belt sensor (PBS)............................................................................................................ 7-29
4.2.10 Transfer drum 3............................................................................................................. 7-29
4.2.11 Erase lamp 3 / Erase holder.......................................................................................... 7-30
4.2.12 Drum jam sensor (DPJ)................................................................................................. 7-31
4.2.13 Oil sensor (OIL) ............................................................................................................. 7-31
CONTENTS
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