Brother HL-5450DNT Service Manual Page 296
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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(10) Release the heater harness of the fuser unit from the guide on the main frame R, and
disconnect the heater harness from the low-voltage-heater harness.
Fig. 7-6
Harness routing: Refer to “3.Fuser unit”.
(11) Remove the fuser unit ground spring from the fuser unit.
(12) Release the center thermistor harness and the side thermistor harness of the fuser unit
from the guide, and disconnect these harnesses from the eject sensor PCB ASSY.
Fig. 7-7
Harness routing: Refer to “3.Fuser unit”.
Note:
• When disconnecting the harness, hold the top of the PCB connector to prevent the
PCB connector being damaged.
Heater harness
Fuser unit
Low-voltage-heater harness
<Frame R side>
Guide
Center thermistor
harness
Eject sensor PCB ASSY
Side thermistor harness
Fuser unit
<Frame L side>
Fuser unit ground
spring
- SERVICE MANUAL 1
- TRADEMARKS 3
- REGULATION 10
- WARNING 11
- CAUTION 11
- Radio Interference 12
- Important 13
- SAFETY INFORMATION 16
- To use the Machine Safely 17
- HOT SURFACE 19
- Additional Information 20
- CHAPTER 1 21
- CHAPTER 1 SPECIFICATIONS 22
- 1. SPECIFICATIONS LIST 23
- <Computer requirements> 26
- 1.2 Network Connectivity 27
- 1.3 Service Information 28
- 1.4 Supplies 29
- 1.5 Paper 31
- 1.5.3 Type and size of paper 32
- 1.6 Printable Area 33
- CHAPTER 2 34
- CHAPTER 2 TROUBLESHOOTING 35
- 1. INTRODUCTION 37
- Operating environment 38
- Power supply 38
- Consumable parts 38
- 2. OVERVIEW 40
- 2.2 Paper Feeding 41
- 2.3 Operation of Each Part 42
- 2.4 Block Diagram 44
- 2.5 Main Components 45
- 3. ERROR INDICATIONS 46
- 3.2 Error Messages 52
- 3.3 LED Display (LED Model) 55
- 4. TROUBLESHOOTING 64
- Error code 0E00 65
- Error code 0F00 65
- Error codes 1000 to 1D00 65
- Error code 1E00 66
- Error codes 1F00 to 3500 66
- Error code 3600 66
- Error codes 3700 to 3A00 66
- Error code 3B00 67
- Error codes 3C00 to 4300 67
- Error code 4400 67
- Error codes 4500 to 4F00 67
- Error code 5000 68
- Error code 5100 68
- Error code 5200 68
- Error code 5300 68
- Error code 5400 68
- Error code 5500 69
- Error code 5600 69
- Error code 5700 70
- Error code 5800 71
- Error code 5900 71
- Error codes 5A00 to 6200 71
- Error code 6300 72
- Error codes 6400 to 6600 72
- Error code 6700 72
- Error codes 6800 and 6900 72
- Error code 7000 74
- Error code 7100 74
- Error code 7200 74
- Error codes 7300 and 7400 74
- Error code 7500 74
- Error code 7600 75
- Error code 7800 75
- Error code 7A00 75
- Error codes 7B00 and 7C00 76
- Error code 7D00 76
- Error codes 7E00 to 8200 76
- Error code 8300 76
- Error code 8400 77
- Error code 8500 77
- Error codes 8600 and 8700 78
- Error code 8800 78
- Error code 8900 78
- Error code 8A00 79
- Error code 8B00 79
- Error code 8C00 80
- Error code 8D00 80
- Error codes 8E00 and 8F00 80
- Error code 9000 81
- Error code 9100 81
- Error code 9200 81
- Error code 9300 81
- Error code 9400 82
- Error code 9500 82
- Error code 9600 83
- Error codes 9700 and 9800 83
- Error code 9900 83
- Error code 9A00 84
- Error codes 9B00 to A000 84
- Error code A100 85
- Error codes A200 to BF00 85
- Error code C000 85
- Error codes C100 to C600 86
- Error code C700 86
- Error code C800 86
- Error code C900 86
- Error codes CA00 to DC00 87
- Error code DD00 87
- Error code DE00 88
- Error code DF00 88
- Error code E000 88
- Error code E100 88
- Error code E200 89
- Error codes E300 and E400 89
- Error code E600 89
- Error codes E700 to EB00 90
- Error code EC00 90
- Error code ED00 90
- Error code EE00 90
- Error code EF00 91
- Error code F000 91
- Error codes F100 to F800 91
- Error code F900 92
- Error codes FA00 to FF00 92
- 4.2.2 Paper becomes wrinkled 93
- 4.2.5 Paper is curled 94
- 4.3.1 Image defect examples 95
- Fig. 2-6 97
- Fig. 2-7 97
- Faulty registration 98
- Poor fixing 99
- Completely blank 99
- Image distortion 100
- All black 100
- Dirt on the back of paper 101
- Vertical streaks 101
- Black band 102
- White horizontal streaks 103
- Black horizontal stripes 104
- Faint print 105
- White spots 106
- Black spots 107
- Fogging 108
- 4.4.1 Cannot print data 109
- Confidential 110
- 4.6.2 LEDs are not activated 111
- 4.7.3 Drum error 112
- 4.8.1 Fuser unit failure 113
- 4.9.1 Laser unit failure 114
- 4.10.1 Main PCB failure 115
- 4.11.3 Main motor failure 116
- CHAPTER 3 117
- CONTENTS 118
- 1. SAFETY PRECAUTIONS 120
- 2. PACKING 121
- Screw pan (S/P washer) 122
- Screw pan 122
- Screw bind 122
- 4. SCREW TORQUE LIST 123
- 5. LUBRICATION 125
- Fig. 3-5 126
- Fig. 3-6 126
- Fig. 3-7 127
- Fig. 3-8 127
- 7. HARNESS ROUTING 128
- 1 Main PCB ASSY 128
- 2 Relay front PCB ASSY 129
- 3 Fuser unit 130
- 5 Toner LED PCB ASSY/Main fan 131
- 6 Laser unit 131
- 9. DISASSEMBLY PROCEDURE 134
- 9.2 Paper tray 1 135
- Fig. 3-12 136
- 9.3 Back cover / Outer chute 137
- 9.4 Fuser cover 138
- 9.5 MP cover ASSY 139
- 9.6 Front cover ASSY 140
- Fig. 3-20 141
- 9.8 Side cover R 142
- 9.9 Top cover ASSY 143
- Fig. 3-23 144
- 9.10 Control panel 145
- LCD model 146
- Fig. 3-26 147
- 9.11 Paper stack lever 148
- Fig. 3-28 149
- 9.13 Fuser unit 150
- Fig. 3-30 151
- Fig. 3-31 151
- Fig. 3-32 152
- Fig. 3-33 152
- 9.14 Main PCB ASSY 153
- Fig. 3-35 154
- 9.15 Laser unit 155
- Fig. 3-37 156
- Fig. 3-38 157
- Fig. 3-39 158
- Fig. 3-40 158
- 9.17 Toner LED PCB ASSY 159
- Fig. 3-42 160
- 9.18 Main fan 161
- Fig. 3-44 162
- 9.19 Air duct / Filter 163
- 9.20 Relay front PCB ASSY 164
- Fig. 3-47 165
- 9.22 Main frame L ASSY 166
- Fig. 3-49 167
- 9.23 Main motor ASSY 168
- Fig. 3-51 169
- Fig. 3-52 170
- 9.25 LT drive gear 29 171
- 9.26 Toner sensor PCB ASSY 172
- 9.27 MP solenoid 173
- Fig. 3-56 174
- 9.29 New toner actuator 175
- 9.30 Fuser drive gear 39 176
- Fig. 3-59 177
- 9.31 Duplex solenoid 178
- 9.32 Back cover sensor 179
- 9.33 LT connector (T1) 180
- 9.34 T1 roller holder ASSY 181
- Fig. 3-64 182
- Fig. 3-65 183
- Fig. 3-66 184
- 9.36 Eject sensor PCB ASSY 185
- Fig. 3-68 186
- Fig. 3-69 187
- Fig. 3-70 188
- Fig. 3-71 189
- Fig. 3-72 190
- Fig. 3-73 191
- Fig. 3-74 192
- Fig. 3-75 193
- Fig. 3-76 194
- 10.1 Paper tray 2 195
- Fig. 3-79 196
- 10.2 T2 roller holder ASSY 197
- 10.3 T2 side cover L 198
- 10.4 T2 side cover R 199
- 10.5 T2 front cover ASSY 200
- 10.6 T2 relay PCB ASSY 201
- 10.7 T2 clutch 202
- Fig. 3-88 203
- Fig. 3-89 203
- Fig. 3-90 204
- Fig. 3-91 204
- Fig. 3-92 205
- Fig. 3-93 206
- 10.9 T2 back cover 207
- 10.10 LT connector ASSY (T2) 208
- CHAPTER 4 209
- What you need to prepare 211
- LED model 214
- LCD model 214
- Fig. 4-1 216
- Fig. 4-2 219
- POWER SUPPLY PCB ASSY 220
- REPLACEMENT PARTS 222
- CHAPTER 5 223
- CHAPTER 5 SERVICE FUNCTIONS 224
- 1. MAINTENANCE MODE 226
- <Function> 231
- <Operation Procedure> 231
- WSWXX = 0 0 0 0 0 0 0 0 233
- Order of pressing buttons 236
- Location of sensors 240
- Fig. 5-6 246
- Fig. 5-7 248
- Fig. 5-8 250
- <Country code list> 253
- 1.4.1 Test printing 260
- 1.4.2 Print font list 261
- 1.4.4 HEX Dump mode 261
- 1.4.8 Check sensor operation 263
- Fig. 5-13 264
- 1.4.11 Print EEPROM Dump 265
- 1.4.12 Check RAM 265
- Fig. 5-14 266
- Fig. 5-15 268
- 1.4.17 Maintenance printing 269
- (First side) (Second side) 271
- 1.4.22 USB speed lock mode 272
- 2. PRINTER SETTINGS 274
- •LCD model 275
- Printer Settings (1st page) 276
- Printer Settings (2nd page) 276
- Life of toner cartridge 277
- Life of drum unit 280
- 3. OTHER SERVICE FUNCTIONS 282
- Change USB No. return value 284
- Model only) 286
- CHAPTER 6 287
- CHAPTER 6 WIRING DIAGRAM 288
- 1. WIRING DIAGRAM 289
- CHAPTER 7 290
- 2.1 Preparation 293
- 2.2 Fuser unit 294
- Fig. 7-4 295
- Fig. 7-5 295
- Fig. 7-6 296
- Fig. 7-7 296
- Fig. 7-8 297
- 2.3 Laser unit 298
- Fig. 7-11 299
- Fig. 7-12 299
- Fig. 7-13 300
- Fig. 7-14 301
- Fig. 7-15 302
- 2.4 MP paper feeding kit 303
- 2.5 Paper feeding kit 1 304
- Fig. 7-19 305
- 2.6 Paper feeding kit 2 306
- Fig. 7-22 307
- Fig. 7-23 307
- APPENDIX 1 308
- <How to Read> 309
- <Location> 309
- APPENDIX 2 310
- <Operating Procedure> 311
- Common to all models 311
- APPENDIX 3 312
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