Brother International HL-720 Service Manual - Page 5

Iii Disassembly And Reassembly, Iii-1, Iv Troubleshooting, Appendices

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2.4.6 Erase lamp ...II-28 2.5 Print Process ...II-28 2.5.1 Charging...II-28 2.5.2 Exposure stage ...II-29 2.5.3 Developing ...II-30 2.5.4 Transfer ...II-30 2.5.5 Drum Cleaning Stage ...II-31 2.5.6 Erasing Stage...II-31 CHAPTER III DISASSEMBLY AND REASSEMBLY III-1 1. SAFETY PRECAUTIONS III-1 2. DISASSEMBLING FLOW III-2 3. DISASSEMBLING PROCEDURE III-3 3.1 Drum Unit...III-3 3.2 Top Cover ...III-3 3.3 Multi-purpose Paper Tray Assy III-4 3.4 Fixing Unit ...III-5 3.5 Scanner Unit ...III-7 3.6 Main PCB Assy ...III-7 3.7 Base Plate Assy...III-8 3.8 Panel sensor PCB Assy...III-8 3.9 Low-voltage Power Supply PCB Assy III-9 3.10 High-voltage Power Supply PCB Assy III-9 3.11 Fan Motor...III-10 3.12 Drive Unit ...III-10 3.13 Main Motor Assy and Motor Heat Sink III-11 3.14 Gears and Solenoid ...III-11 3.15 Tray Extension ...III-12 3.16 Paper Eject Tray Assy ...III-12 4. PACKING...III-13 CHAPTER IV TROUBLESHOOTING IV-1 1. INTRODUCTION...IV-1 1.1 Initial Check ...IV-1 1.2 Basic Procedure ...IV-2 2. IMAGE DEFECTS ...IV-3 2.1 Image Defect Examples...IV-3 2.2 Troubleshooting Image Defects IV-4 3. TROUBLESHOOTING OF MALFUNCTIONS IV-12 4. INSPECTION MODE...IV-17 4.1 Incorporated Inspection Modes IV-17 4.2 Error codes ...IV-19 APPENDICES ...V-1 1. Connection Diagram, HL-720 V-1 2. Connection Diagram, HL-730/730Plus V-2 3a. Main PCB Circuit Diagram (1/2), HL-720 V-3 3b. Main PCB Circuit Diagram (2/2), HL-720 V-4 4. Main PCB Circuit Diagram (1/2), HL-730/730Plus V-5 5. Main PCB Circuit Diagram (2/2), HL-730/730Plus V-6 6. Panel/Sensor PCB Circuit Diagram V-7 ii

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ii
2.4.6
Erase lamp
............................................................................................................................
II-28
2.5
Print Process
..........................................................................................................................
II-28
2.5.1
Charging
.................................................................................................................................
II-28
2.5.2
Exposure stage
......................................................................................................................
II-29
2.5.3
Developing
.............................................................................................................................
II-30
2.5.4
Transfer
..................................................................................................................................
II-30
2.5.5
Drum Cleaning Stage
.............................................................................................................
II-31
2.5.6
Erasing Stage
.........................................................................................................................
II-31
CHAPTER III DISASSEMBLY AND REASSEMBLY
.................................................
III-1
1.
SAFETY PRECAUTIONS
................................ ................................ ................................ ..
III-1
2.
DISASSEMBLING FLOW
................................ ................................ ................................ ..
III-2
3.
DISASSEMBLING PROCEDURE
................................ ................................ .....................
III-3
3.1
Drum Unit
.................................................................................................................................
III-3
3.2
Top Cover
................................................................................................................................
III-3
3.3
Multi-purpose Paper Tray
Assy
..............................................................................................
III-4
3.4
Fixing Unit
................................................................................................................................
III-5
3.5
Scanner Unit
............................................................................................................................
III-7
3.6
Main PCB Assy
.......................................................................................................................
III-7
3.7
Base Plate Assy
.......................................................................................................................
III-8
3.8
Panel sensor PCB Assy
...........................................................................................................
III-8
3.9
Low-voltage Power Supply PCB Assy
.....................................................................................
III-9
3.10
High-voltage Power Supply PCB Assy
....................................................................................
III-9
3.11
Fan Motor
...............................................................................................................................
III-10
3.12
Drive Unit
...............................................................................................................................
III-10
3.13
Main Motor Assy and Motor Heat Sink
..................................................................................
III-11
3.14
Gears and Solenoid
...............................................................................................................
III-11
3.15
Tray Extension
.......................................................................................................................
III-12
3.16
Paper Eject Tray Assy
...........................................................................................................
III-12
4. PACKING
................................ ................................ ................................ ........................
III-13
CHAPTER IV TROUBLESHOOTING
.........................................................................
IV-1
1. INTRODUCTION
................................ ................................ ................................ ..............
IV-1
1.1
Initial Check
............................................................................................................................
IV-1
1.2
Basic Procedure
.....................................................................................................................
IV-2
2.
IMAGE DEFECTS
................................ ................................ ................................ ............
IV-3
2.1
Image Defect Examples
..........................................................................................................
IV-3
2.2
Troubleshooting Image Defects
..............................................................................................
IV-4
3.
TROUBLESHOOTING OF MALFUNCTIONS
................................ ................................
IV-12
4.
INSPECTION MODE
................................ ................................ ................................ ......
IV-17
4.1
Incorporated Inspection Modes
............................................................................................
IV-17
4.2
Error codes
...........................................................................................................................
IV-19
APPENDICES
.............................................................................................................
V-1
1.
Connection Diagram, HL-720
..................................................................................................
V-1
2.
Connection Diagram, HL-730/730Plus
....................................................................................
V-2
3a.
Main PCB Circuit Diagram (1/2), HL-720
.................................................................................
V-3
3b.
Main PCB Circuit Diagram (2/2), HL-720
.................................................................................
V-4
4.
Main PCB Circuit Diagram (1/2), HL-730/730Plus
...................................................................
V-5
5.
Main PCB Circuit Diagram (2/2), HL-730/730Plus
...................................................................
V-6
6.
Panel/Sensor PCB Circuit Diagram
.........................................................................................
V-7