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Service Manual
Adjustment and Troubleshooting
4-40
Samsung Electronics
4.2.3 The cause and solution of the bad discharge
1) Wrong Print Position
Description: Printing begins at wrong position on the paper.
Wrong sense time caused by defective
feed sensor actuator.
Replace the defective actuator
- LASER PRINTER 1
- Continued 3
- 1. Precautions 6
- 1.2 Caution for safety 7
- 1.2.3 Handling Precautions 8
- 1.3 ESD Precautions 9
- ML-3471ND 10
- 2.1.2.2 Controller & S/W 11
- 2.1.2.3 Paper Handling 12
- 2.1.2.4 Consumables 13
- 2.1.2.6 Environment 13
- 2.1.2.7 Options 14
- 2.1.2.8 Others 14
- 2.1.3 Model Comparison Table 15
- 2.1.4 Accessory List 15
- 2.2 System Overview 16
- 2.2.1.2(a) Feeding Section 17
- 2.2.1.2(b) Transfer Ass’y 17
- Drive Ass'y 18
- Duplex Drive Ass'y 18
- Connection 18
- Duplex Motor 18
- 2.2.1.2(f) Toner Cartridge 19
- 2.2.1.2(e) LSU 19
- 2.21.2(h) Optional Tray (SCF) 20
- 2.2.1.2(g) Duplex Unit 20
- 2.2.2.1 Frame 21
- 2.2.2.2 Feeding Part 21
- 2.2.2.3 Transfer Ass’y 21
- 2.2.2.4 Driver Ass’y 22
- 2.2.2.5 Fixing Part (Fuser) 23
- 2.2.2.5(e) Pressure Roller 24
- 2.2.2.7 Toner Cartridge 25
- 2.2.2.7(c) Supply Roller 26
- 2.2.2.7(e) CHARGING PORTION 26
- 2.2.3.1(a) Asic(SPGPv3) 27
- 2.2.3.1(b) Memory 28
- 2.2.3.1(c) Others 28
- 2.2.3.1(d) Flash Memory 29
- 2.2.3.1(e) SDRAM 29
- HVPS PBA 32
- 2.2.3.3 Engine F/W 35
- 2.2.4 S/W Descriptions 37
- 2.2.4.3 Data and Control Flow 38
- 3. Disassembly and Reassembly 40
- Disassembly and Reassembly 41
- Cassette 43
- Toner Cartridge 43
- Front Cover 43
- MP Tray Ass'y 44
- Tray Link 44
- 3.5 Rear Cover 45
- Fuser Ass'y 46
- Thermostat 46
- CON Harness 46
- REC Harness 46
- Input Guide 47
- Thermister 47
- Fuser Cover 47
- Fuser Frame 47
- Heat Roller 48
- Fuser Gear 48
- Top Cover 49
- OPE Unit 50
- Right Side Cover 51
- Left Side Cover 51
- DIMM Cover 52
- Gear Bracket Ass'y 54
- BLDC Motor Ass'y 54
- 3.12 Duplex Drive Ass'y 55
- Insulator Sheet 56
- Shield SMPS (With AC Inlet) 56
- AC Inlet Connector 56
- 3.15 Fuser Drive Ass'y 58
- 3.16 Fan 59
- 3.19 HVPS Housing 62
- 3.20 Cover Mid Front 63
- 3.21 MPF Housing 63
- 3.22 Feed Roller Parts 64
- Feed Shaft 65
- Feed1 Gear Ass'y 65
- Clutch Unit 65
- Feed1 Roller 65
- Pick Up Gear Ass'y 66
- Pick Up Gear Shaft 66
- Feed Solenoid 66
- Manual Solenoid 66
- CRUM2 PBA 67
- Terminal 67
- 3.27 Transfer Roller Parts 68
- 4.1 Alignment and Adjustments 69
- 4.1.2 Control Panel 70
- 4.1.2.2 System setup 71
- ML-3470D ML-3471ND 73
- 4.1.4.1 Status LED 75
- 4.1.4.1 Error Message 76
- 4.1.6 How to use DCU 79
- 4.1.6.2 Code 80
- 1) Normal Code 80
- 2) Error Code 80
- 4.1.6.3 Self Diagnostic Mode 81
- 4.1.6.4 Self Test Button 83
- 4.1.7 Paper Jam 84
- 4.2 Troubleshooting 91
- 2) Vertical White Line 93
- 3) Horizontal Black Band 94
- 4) Black/White Spot 95
- 5) Light Image 96
- 6) Dark Image or a Black Page 97
- 7) Uneven Density 98
- 8) Background 99
- 9) Ghost (1) 100
- Service Manual 101
- Samsung Electronics 101
- 10) Ghost (2) 102
- 11) Ghost (3) : Fuser 103
- Digital Printer 104
- 13) Stains on Back of Page 105
- 14) Blank Page Print out (1) 106
- 15) Blank Page Print out (2) 107
- 1) Wrong Print Position 108
- BIN PATH 109
- 7) Multi-Feeding 114
- 1) Fuser Error 117
- 2) LSU Error 118
- 1. Check the Heat Lamp 119
- 1. Replace the Fuser 119
- 2. Replace the Main PBA 119
- 3. Replace the SMPS 119
- 4) Paper Empty 120
- 6) Cover Open 122
- 8) Defective motor operation 124
- 9) No Power 125
- 4.2.5.4(a) Invalid Toner 128
- 4.2.5.4(b) Low Toner 128
- 4.2.5.4(c) Replace Cartridge 128
- 3) Abnormal Printing 134
- Contents 136
- 5.1 Main 137
- Main Parts List 138
- 5.2 Cover Ass'y 139
- Cover Ass’y Parts List 140
- 5.3 Front Cover Ass'y 141
- Drawer# SEC_Code Description 142
- Location 142
- QT'y Service Remark 142
- 5.4 Rear Cover Ass'y 143
- 5.5 OPE Cover Ass'y 144
- 5.6 Frame 145
- Frame Parts List 146
- 5.7 MP Ass'y 149
- MP Ass’y Parts List 150
- 5.8 Main Drive Ass'y 151
- Main Drive Parts List 152
- 5.9 Fuser Drive Ass'y 153
- 5.10 Duplex Unit (Optional) 154
- 5.11 Fuser Unit 156
- Fuser Unit Parts List 157
- 5.12 Cassette Unit 159
- Cassette Unit Parts List 160
- 6. System Diagram 161
- 6.2 Connection Diagram 162
- Standard : For general use 163
- Acronyms and Abbreviations(2) 165
- Antenna connector 166
- RJ-45 Jack 166
- Active LED(Green) 166
- Link LED 166
- (Red/Green/Orange) 166
- 7.5 Sample Tests Patterns 167
- 7.6.1 Double Feed Error 168
- 7.6.2 Jam0 169
- 7.6.3 Jam1 170
- Reference Information 171
- ΄ΥΚΝΝ͑ΡΣΠΓΝΖΞ͑͑ΗΚΩΖΕ͑Ͱ 172
- 7.6.6 Low Toner 173
- 7.6.7 Over Heat Error 174
- 7.6.8 Low Heat Error 175
- 7.6.9 Fuser Door Open 176
- 7.6.11 LSU Error 178
- 7.6.12 Scan Lock Error 179
- 7.6.14 All black printing 181
- 7.6.15 Blank Copy 182
- 7.6.16 Images at 1 Copy 183
- Replace Scanning Unit Assy 184
- Re- Copying 184
- Check if the Scan Glass 184
- 7.6.18 Document Jam 185
- 7.8 Model Information 187
- 7.8.4 F/W Upgrade Method 188
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