Brother HL-8050N Manual de servicio - Página 5
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CHAPTER 3 THEORY OF OPERATION ................................................ 3-1
1.
ELECTRONICS .........................................................................................................3-1
1.1
General Block Diagram.................................................................................................... 3-1
1.2
Main PCB ......................................................................................................................... 3-2
1.2.1 Outline................................................................................................................................. 3-2
1.2.2 Circuit.................................................................................................................................. 3-4
2.
MECHANICS .............................................................................................................3-6
2.1
Summary of Print Process ............................................................................................... 3-6
2.2
Flow of Print Data............................................................................................................. 3-9
2.3
Driving Force Transmission Path................................................................................... 3-10
2.3.1 Main Motor ........................................................................................................................ 3-10
2.3.2 Motor ASSY Exit ............................................................................................................... 3-10
2.3.3 Gear Layout ...................................................................................................................... 3-11
2.4
Paper Transport ............................................................................................................. 3-14
2.4.1 Paper Transport Path........................................................................................................ 3-14
2.4.2 Layout of Paper Transport Path ........................................................................................ 3-15
2.5
Actions of Main Functional Components ....................................................................... 3-17
2.5.1 Paper Cassette ................................................................................................................. 3-17
2.5.2 Paper Feeder .................................................................................................................... 3-20
2.5.3 Engine............................................................................................................................... 3-22
2.5.4 Fuser................................................................................................................................. 3-25
2.5.5 500 Paper Exit & Option Face Up Tray ............................................................................ 3-27
2.5.6 Drive ................................................................................................................................. 3-28
2.5.7 Electrical .......................................................................................................................... 3-29
2.6
Control............................................................................................................................ 3-31
2.6.1 Control of Paper Size ........................................................................................................ 3-31
2.6.2 ROS Control...................................................................................................................... 3-31
2.6.3 Fuser Control .................................................................................................................... 3-32
2.7
Schematic Diagrams of Safety System ......................................................................... 3-33
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
Drum Unit ......................................................................................................................... 4-3
3.2
Paper Cassette 150 ......................................................................................................... 4-3
3.3
Paper Cassette 550 ....................................................................................................... 4-10
3.4
Face-up Output Tray ASSY .......................................................................................... 4-16
3.5
Stopper FSR/Cover Rear 500........................................................................................ 4-16
3.6
Disassembly of the Cover Rear 500 .............................................................................. 4-17
3.7
Cover Rear..................................................................................................................... 4-20
3.8
Cover Right .................................................................................................................... 4-21
3.9
Cover Left....................................................................................................................... 4-22
3.10 Cover Exit 500................................................................................................................ 4-22
3.11 500 Exit ASSY................................................................................................................ 4-23
3.12 Cover Top/Operation Panel ........................................................................................... 4-29
3.13 Cover Front ................................................................................................................... 4-31
iii
HL-8050N SERVICE MANUAL