Samsung ML-1740 - ML 1740 B/W Laser Printer Especificaciones Pagina 26
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SUMMARY OF PRODUCT
Service Manual
4.3 Main PBA(SPL Model)
The Engine Board and the Controller Board are in one united board, and it is consisted of CPU part and
print part in functional aspect. The CPU is functioned as the bus control, I/O handling, drivers, and PC inter-
face. The main board sends the Current Image dlml Video data to the LSU and manages the conduct of
Electrophotography for printing. It is consisted of the circuits of the motor (paper feed, pass)
driving, clutch driving, pre-transfer lamp driving, current driving, and fan driving.
The signals from the paper feed jam sensor and paper empty sensor are directly inputted to the main
board.
ASIC
SDRAM
FLASH
MEMORY
MOTOR DRIVER IC
BUFFER
VIDEO CLK
14.7456MHz
USB CONN COMPARATOR IC
MAIN CLK
10MHz
CLOCK
GENERATOR IC
PARELLEL
CONN
U32
U13 CN7CN8
U24
CN3
CN10
CN6
CN9
OSCI
U27
U16
U26
CN5
OSC2
CN2(DCU PORT) U25U20 U31
- LASER PRINTER 1
- ML-1740/XSH 1
- ELECTRONICS 2
- 2003. 12 3
- 1. Precautions 4
- 1.2 Caution for safety 5
- Precautions 6
- 1.3 ESD Precautions 7
- 2. Reference Information 8
- 2.1 Tool for Troubleshooting 8
- 2.3.1 A4 5% Pattern 10
- 2.3.2 A4 2% Pattern 11
- 2.3.3 A4 IDC Pattern 12
- REFERENCE INFORMATION 13
- Samsung Electronics 13
- Service Manual 13
- 3. Specifications 14
- 3.3 Electrical Specification 15
- 3.2 Controller Specification 15
- 3-4 Environmental Range 15
- Specifications 16
- 4. Summary of Product 18
- 4.1.2 Rear View 19
- 4.1.3 Inside View 19
- 4.1.3 Control Panel 20
- 2) Cancel button 21
- 4.2 System Layout 22
- 4.2.4.3 Heat Roller 23
- 4.2.4.4 Pressure roller 23
- 4.2.4.5 Safety Relevant Facts 24
- 4.2.6 Toner Cartridge 25
- 4.3 Main PBA(SPL Model) 26
- •Main function block 27
- 1) Paper Empty Sensing 27
- 2) MP Sensing 27
- 4) Paper Exit Sensing 28
- 5) Cover Open Sensing 28
- 6) DC FAN / SOLENOID Driving 28
- 7) Motor Driving 28
- 4.4 SMPS & HVPS 29
- 2) Charge Voltage (MHV) 30
- 3)Cleaning Voltage (THV-) 30
- 5) Supply Voltage(SUP) 30
- 1) AC Input 31
- 2) Rated Power Output 31
- 3) Consumption Power 31
- 4) Length of Power Cord : 31
- 5) Power Switch : 31
- 4.4.3 Fuser AC Power Control 32
- 4.5.1.1 Jam 0 33
- 4.5.1.2 Jam 1 33
- 4.5.1.3 Jam 2 33
- 4.5.4.1 Heat Lamp Method 34
- 4.5.4.2 Q-PID Method 34
- 4.5.5 LSU 35
- 5. Disassembly and Reassembly 36
- Top Cover 37
- Rear Cover 37
- Front Cover 37
- 5.3 Fuser 38
- 5.4 Exit Roller 39
- Drive Ass'y 40
- Engine Shield 41
- Ass'y 41
- Main PBA 41
- Inlet Bracket 42
- 5.11 Transfer Roller 43
- 5.12 Feed Roller 44
- Disassembly and Reassembly 45
- 6. Alignment and Adjustments 46
- 6.1.2 Code 47
- 6.1.3 Self Diagnostic Mode 48
- LIGNMENT & DJUSTMENTS 49
- 6.1.4 Self Test Button 50
- 6.2 Paper Path 51
- 6.3 Clearing Paper Jams 52
- 6.3.2 In the Paper Feed Area 53
- Service 54
- 6.4 Sample Pattern 55
- ML-1740 Series 56
- <Rollers Layout> 59
- 7. Troubleshooting 61
- 7.1.3 Horizontal Black Band 62
- 7.1.4 Black/White Spot 62
- 7.1.5 Light Image 63
- 7.1.6 Dark Image or a Black 63
- Digital Printer 64
- 7.1.9 Ghost (1) 65
- 7.1.10 Ghost (2) 65
- 7.1.11 Ghost (3) 66
- 7.1.12 Ghost (4) 66
- 7.2 bad discharge 68
- 7.2.3 JAM 1 69
- 7.2.4 JAM 2 69
- 7.2.5 Multi-Feeding 70
- TROUBLESHOOTING 71
- 7.3 Malfunction 72
- 7.3.4 Paper Empty 73
- 7.3.6 Cover Open 74
- 7.3.9 No Power 75
- 7.4 Toner Cartridge Service 77
- 7.5.3 Abnormal Printing 82
- 7.5.4 SPOOL Error 83
- 8.1 Main Assembly 85
- SA : Service Available 86
- 8.2 Frame Unit Assembly 87
- 8.4 Cassette Unit Assembly 91
- 8.5 Fuser Unit Assembly 93
- 9. Block Diagram 96
- COMPATIABLE 97
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