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Samsung ML-1665 Service Manual - Page 25

LSU Laser Scanner Unit, OPC Drum, hoto Diode, LD Driver circit, LDLaser Diode, olygon Mirror - has scan

UPC - 635753627763

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Product spec and feature 2.2.3.5 LSU (Laser Scanner Unit) It is the core part of the LBP which switches from the video data received to the controller to the electrostatic latent image on the OPC drum by controlling laser beam, exposing OPC drum, and turning principle of polygon mirror. The OPC drum is turned with the paper feeding speed. The /HSYNC signal is created when the laser beam from LSU reaches the end of the polygon mirror, and the signal is sent to the controller. The controller detects the /HSYNC signal to adjust the vertical line of the image on paper. In other words, after the /HSYNC signal is detected, the image data is sent to the LSU to adjust the left margin on paper. The one side of the polygon mirror is one line for scanning. OPC Drum Photo Diode LD Driver circit Protector panel LD(Laser Diode) Polygon Mirror Polygon Motor Motor Driver Service Manual 2-15 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

Match case Limit results 1 per page

Product spec and feature

Service Manual

2-15

Samsung Electronics

2.2.3.5 LSU (Laser Scanner Unit)

It is the core part of the LBP which switches from the video data received to the controller to the electrostatic

latent image on the OPC drum by controlling laser beam, exposing OPC drum, and turning principle of

polygon mirror. The OPC drum is turned with the paper feeding speed. The /HSYNC signal is created when

the laser beam from LSU reaches the end of the polygon mirror, and the signal is sent to the controller.

The controller detects the /HSYNC signal to adjust the vertical line of the image on paper. In other words,

after the /HSYNC signal is detected, the image data is sent to the LSU to adjust the left margin on paper.

The one side of the polygon mirror is one line for scanning.

OPC Drum

hoto Diode

LD Driver circit

Protector panel

LD(Laser Diode)

olygon Mirror

olygon Motor

Motor Driver