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Samsung ML-1665 Service Manual - Page 30

Main board, Fuser, 2.4.2 HVPS and SMPS Board

UPC - 635753627763

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Product spec and feature 2.2.4.2 HVPS and SMPS Board The HVPS Board and SMPS Board are in one united board. The HVPS board creates the high voltage of THV/MHV/Supply/Dev and supplies it to the developer part for making best condition to display the image. The HVPS part takes the 24V and outputs the high voltage for THV/MHV/BIAS, and the outputted high voltage is supplied to the toner, OPC cartridge, and transfer roller It is the power source of entire system. It is assembled by an independent module, so it is possible to use for common use. It is mounted at the side of the set. It is consisted of the SMPS part, which supplies the DC power for driving the system, and the AC heater control part, which supplies the power to fuser. SMPS has two output channels. Which are +3.3V and +24V. Main board Fuser Service Manual 2-20 Samsung Electronics

Section	Page
Service manual (ML-1660)	1
Contents	3
1. Precautions	6
2. Product spec and feature	11
2.1 Product Specifications	11
2.1.1 Product Overview	11
2.1.2 Specifications	12
2.1.3 Model Comparison Table	17
2.2 System Overview	18
2.2.1 Front View	18
2.2.2 Rear View	19
2.2.3 System Layout	20
2.2.4 Engine H/W Specific	27
2.2.5 Engine F/W Contol Algorithm	33
2.2.6 S/W Descriptions	35
3. Disassembly and Reassembly	38
3.1 Precautions when replacing parts	38
3.2 Screws used in the printer	39
3.3 Cover	40
3.3.1 Left/Right cover	40
3.3.2 Rear bracket	40
3.3.3 Cover-open	41
3.3.4 Top/Front cover	41
3.4 Main PBA	42
3.5 SMPS/HVPS board	43
3.6 Fuser unit	44
3.7 LSU	45
3.8 Drive unit	46
3.9 Step motor	47
3.10 Pick up roller	48
4. Alignment and Troubleshooting	49
4.1 Alignment and Adjustments	49
4.1.1 Control Panel	49
4.1.2 Understanding The Control Panel	50
4.1.3 JAM Removal	51
4.1.4 Printing a report	53
4.1.5 Periodic Defective Image	56
4.1.6 Firmware upgrade	57
4.1.7 Using the smart panel program	58
4.2 Troubleshooting	60
4.2.1 Procedure of Checking the Symptoms	60
4.2.2 Bad discharge	63
4.2.3 Malfunction	67
4.2.4 Bad image	72
Smart Panel error message	86
5. System Diagram	108
5.1 Block Diagram	108
5.2 Connection Diagram	109

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Product spec and feature

Service Manual

2-20

Samsung Electronics

2.2.4.2 HVPS and SMPS Board

The HVPS Board and SMPS Board are in one united board.

The HVPS board creates the high voltage of THV/MHV/Supply/Dev and supplies it to the developer part for

making best condition to display the image. The HVPS part takes the 24V and outputs the high voltage for

THV/MHV/BIAS, and the outputted high voltage is supplied to the toner, OPC cartridge, and transfer roller

It is the power source of entire system. It is assembled by an independent module, so it is possible to use for

common use. It is mounted at the side of the set.

It is consisted of the SMPS part, which supplies the DC power for driving the system, and the AC heater

control part, which supplies the power to fuser. SMPS has two output channels. Which are +3.3V and +24V.

Main board

Fuser