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Brother T-8420B Service Manual Page 343
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Table of contents
TROUBLESHOOTING
BOOKMARKS
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APPE
NDIX 4 CI
RCUIT DIA
GRAMS
A-58
Appendix 4.9 Engine PCB Circuit Diagram (2/2)
1
2
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SERVICE MANUAL
1
PREFACE
3
TABLE OF CONTENTS
4
APPENDIX 4 CIRCUIT DIAGRAMS
9
REGULATION
10
CLASS 1LASERP RODUCT
11
APPAREIL Å LASER DE CLASSE 1
11
LASER KLASSE 1 PRODUKT
11
SAFETY INFORMATION
12
CHAPTER 1 GENERAL
14
2. SPECIFICATIONS
16
2.3 Print Media
17
2.4 Copy
17
2.5 Fax
18
2.6 Scanner
19
2.7 Printer
19
2.8 Interfaces
20
2.9 Consumable Items
20
2.11 Computer Requirements
21
2.12 Paper
22
CHAPTER 1 GENERAL
23
2.13 Printable Area
24
TN7600/TN560 TN7300/TN530
28
3 A 1 1 J A
29
A 3 9 5 1 0 0 1 0 4 A
29
3 A 3 0 J
30
M 3 9 A 0 0 0 1 9 9 A
30
2 8 0 0 1
30
1.1 Power Supply
31
1.2 Environment
31
2. UNPACKING
32
3. INSTALL THE MACHINE
33
Fig. 2-5
35
Fig. 2-6
35
Fig. 2-7
35
Fig. 2-11
37
Scanner lock lever
37
1. ELECTRONICS
57
1.2 Main PCB Block Diagram
58
1.3 Main PCB
59
Fig. 3-5
60
Fig. 3-6
60
Fig. 3-7
61
Fig. 3-8
61
Fig. 3-9
62
Fig. 3-14
64
Fig. 3-15
64
Fig. 3-16
65
1.4 Engine PCB
66
1.5 Power Supply
67
Fig. 3-18
68
2. MECHANICS
69
2.2 Scanner Mechanism
70
2.3 Paper Transfer
71
2.4 Sensors
73
2.5 Drum Unit
78
2.6 Toner Cartridge
78
2.7 Print Process
78
1. SAFETY PRECAUTIONS
82
2. DISASSEMBLY FLOW
83
3. DISASSEMBLY PROCEDURE
84
3.3 Paper Tray
85
3.5 Access Cover / Battery
98
3.6 Driver PCB Access Cover
99
3.7 ADF Unit
100
3.8 Document Scanner
109
3.9 Panel Unit
114
Taptite, bind B M4x12
117
Rear cover C
117
Fig. 4-62
117
3.13 Rear Cover L/R
120
3.14 Side Cover L/R
121
3.15 Joint Cover
122
Fig. 4-77
125
Support flap
125
Support flap S
125
(1) Release the link
126
3.18 Rear Cover Sensor
132
3.20 Fixing Unit
134
3.21 Laser Unit
143
Fig. 4-113
144
Shutter arm C
144
Frame L
144
3.22 Main PCB
145
3.25 Engine PCB
149
3.28 Paper Feeder
152
3.29 Frame L / Drive Unit
159
3.31 Thermistor ASSY
164
3.33 Frame R
165
4. PACKING
167
6. SCREW TORQUE LIST
171
4. ADF Unit
172
5. Panel
172
7. LUBRICATION
173
* EM3: Grease EM-D110
174
3 mm dia. ball
174
Separation plate ASSY
175
Paper feed chute
175
Rubber holder
175
8. HARNESS ROUTING
176
1. CONSUMABLE PARTS
178
1.2 Toner Cartridge
180
Fig.5-5
181
Fig.5-6
181
Fig.5-7
181
(Pad holder ZL2 / Paper
184
2.1 Fixing Unit
185
2.2 Paper Feeding Kit
189
3. PERIODICAL CLEANING
191
3.3 Cleaning the Printer
192
3.4 Cleaning the Drum Unit
193
Fig. 5-28
194
Fig. 5-29
194
4. MTBF / MTTR
195
1. INTRODUCTION
196
CHAPTER 6 TROUBLESHOOTING
197
1.3 Identify the Problem
198
2. ERROR MESSAGE
199
3. PAPER PROBLEMS
206
3.2 Original Jams
207
3.3 Paper Jams
208
Fig. 6-6
209
Fig. 6-7
209
Fig. 6-8
209
Fig. 6-9
210
Fig. 6-10
210
Fig. 6-11
211
Fig. 6-12
211
Fig. 6-13
211
3.4 Paper Feeding Problems
213
F-1 Double feeding
213
F-2 Wrinkles or creases
213
F-3 Page skew
213
F-4 Curl or Wave
214
(Windows98/Me only)
216
5. MALFUNCTIONS
218
M-3 Main motor failure
219
M-4 No paper supplied
219
M-7 Laser Unit failure
220
M-9 Fixing Unit failure
221
M-10 Main PCB failure
221
M-12 Engine PCB error
222
M-14 DIMM failure
222
8. IMAGE DEFECTS
229
I-1 Light
230
I-2 Dark
231
I-3 Completely blank
232
I-4 All black
233
I-9 White vertical streaks
237
I-11 Faulty registration
238
I-12 Poor fixing
238
I-13 Image distortion
239
I-14 Faint print
239
I-15 White spots
240
I-16 Black spots
242
I-17 Black band
243
I-18 Gray background
244
I-19 Hollow print
245
I-21 Horizontal lines
246
I-22 Light rain
246
I-23 Ghost
247
I-24 Toner specks
247
9. INCORRECT PRINTOUT
249
10. NETWORK PROBLEM
251
10.2 Intermittent Problem
252
10.3 TCP/IP Troubleshooting
253
10.4 UNIX Troubleshooting
253
Within 2 seconds
259
CHAPTER 7 MAINTENANCE MODE
260
< IMPORTANT>
261
Fig.7-3
264
Fig.7-4
266
Selector 1 Selector 8
268
↓ ↓
268
Fig.7-5
269
Fig.7-6
270
(MFC-8420/8820D/8820DN only)
274
Fig.7-12
276
Fig.7-13
277
Fig.7-14
277
WSW01 (Dial pulse setting)
293
WSW07 (Dial tone setting 1)
299
WSW08 (Dial tone setting 2)
300
WSW11 (Busy tone setting)
303
WSW13 (Modem setting)
305
Selectors 8: CRP option
307
WSW16 (Function setting 1)
308
WSW17 (Function setting 2)
309
WSW18 (Function setting 3)
310
Selector 7: V. 34 mode
311
* EP: Echo protection
312
WSW27 (Function setting 5)
317
WSW28 (Function setting 6)
318
WSW29 (Function setting 7)
319
WSW30 (Function setting 8)
319
WSW31 (Function setting 9)
320
WSW32 (Function setting 10)
321
WSW33 (Function setting 11)
321
WSW34 (Function setting 12)
322
WSW35 (Function setting 13)
322
WSW37 (Function setting 15)
324
WSW39 (Function setting 17)
326
WSW40 (Function setting 18)
327
WSW41 (Function setting 19)
328
WSW43 (Function setting 21)
330
Selector 8: JPEG coding
330
WSW47 (Function setting 22)
333
Not used
334
APPENDIX 4 CIRCUIT DIAGRAMS
335
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