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DIGITAL LASER MFP
Basic Model : SCX-4200
DIGITAL LASER MFP The keynote of Product
[ Key Features ]
- 18ppm Print/Copy Speed
- 600dpi Print/Copy Resolution
- 600 x 2400dpi Scan Resolution
- Samsung Print Language
- 8MB System Momory
- 250sh Paper Input/50sh Paper Output
- Under 42sec Warm-up Time
- 16 x 2 Line LCD Display
- USB 2.0
- 3K Toner Yield: initial(1K), sales(3K)
- Special Copy: ID Copy, Clone, 2-up, Poster,
1.1 Safety Warning 1-1
1.2 Caution for safety 1-2
1.3 ESD Precautions 1-5
1.4 Super Capacitor or Lithium Battery Precautions 1-5
2. Product Specification
2.1 Product Overview 2-1
2.2 Specifications 2-2
3. System Overview
3.1 System Outline 3-1
3.2 H/W Structure abd Descriptions 3-9
3.3 S/W Structure and Descriptions 3-19
4. Alignment and Adjustments
4.1 Engine Test Mode 4-1
4.2 Paper Path 4-2
4.3 Clearing Paper Jams 4-3
4.4 Printing the System Data List 4-6
4.5 Clearing the Memory 4-6
4.6 Clearing the Drum 4-6
4.7 Consumables and Replacement Parts 4-7
4.8 The LCD Status Display by Each Error 4-7
4.9 Periodic Defective Image 4-8
4.10 Error Message 4-9
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly 5-1
5.2 Front Cover 5-2
5.3 Rear Cover 5-3
5.4 DC Fan 5-4
5.5 Right Side Cover 5-5
5.6 Left Side Cover 5-6
5.7 Scanner Unit 5-7
5.8 OPE Unit 5-10
5.9 Middle Cover Unit 5-11
5.10 Fuser 5-12
5.11 Exit Roller 5-14
5.12 LSU 5-15
5.13 Fan 5-16
5.14 Drive Ass'y 5-16
5.15 Engine Shield Ass'y 5-17
5.16 Main PBA 5-17
5.17 SMPS 5-18
5.18 CRUM PCB 5-19
5.19 Transfer Roller 5-20
5.20 Feed Roller 5-21
5.21 Pick Up Roller & Solenoid 5-23
6.1 Procedure of Checking the Symptoms 6-1
6.2 Solution of Image Problem 6-5
6.3 Paper Feeding Problems and Troubleshooting 6-10
6.4 Symptoms of Bad Operation and Troubleshooting 6-13
6.5 Treatment of Error Message 6-17
7. Block diagram
7.1 System Block Diagram 7-1
8. Exploded Views & Parts List
8.1 Exploded Views and Parts List 8-1
9. Connection Diagram
9.1 SCX-4200 Connection Diagram 9-1
10. Schematic Diagram
10.1 Main Board 10-1
10.2 OPE Circuit Diagram 10-8
10.3 SMPS-110V 10-9
10.3 SMPS-220V 10-13
11. Reference Information
11.1 Tools for Troubleshooting 12-1
11.2 Acronyms and Abbreviations 11-2
11.3 Select a location for the printer 11-4
11.4 A4 ISO 19752 Standard Pattern 11-5
Service Manual 6-1
6.1 Printing Problems – Causes and Solutions
6.1.1 Vertical Black Lines and Bands
• Description 1. Straight thin black vertical lines occur in the printing.
2. Dark black vertical bands occur in the printing.
Check and Cause Solution
1. Damaged developer roller, deformed
Doctor-blade in the Toner cartridge.
2. Scratched surface of the charge roller in
the toner cartridge.
1. Replace the toner cartridge and test
2. Replace the toner cartridge and test
6.1.2 Vertical White Line
• Description White vertical voids in the image.
Check and Cause Solution
1. 1. Contamination of the window or
internal lenses of LSU mirror.
2. Foreign object inside the toner cartridge
or low toner.
3. Foreign object, contamination or burr on
the edge of the toner cartridge window.
4. If the fuser is defective, voids occur
periodically at the top of a black image.
5. Contamination of the OPC drum.
1. Clean the LSU window with recommended
cleaner (IPA) Clean the window with a
clean cotton swab. If dirt is inside the LSU
– replace LSU.
2. Replace the toner cartridge.
3. Clean the exposure window.
4. Open the front cover and check the ribs
that correspond to the position of the
voids. Remove if found.
5. If the problems are not solved, replace
the toner cartridge.
Exploded Views & Parts List
Service Manual 8-1
8.1 Main Exploded View 8-2
8.2 Housing Base Exploded View 8-3
8.3 Frame Assembly Exploded View 8-4
8.4 Fuser Unit Exploded View 8-5
8.5 Drive Assembly Exploded View 8-6
8.6 Scan Assembly Exploded View 8-7
8.7 OPE Assembly Exploded View 8-8
8.8 Cassette Assembly Exploded View 8-9
8. Exploded Views and Parts List (SCX-4200/XEV)
Part Number & Description format.
There are two types of Part number format.
Part numbers and descriptions are defined according to a company standard. The information below
will help you to understand the part number format and assist when ordering spare parts.
This format is used throughout Samsung on all product ranges.
Typically it is used for small components and electronic parts.
This format is controlled by individual Samsung Divisions and is used on specific
products, typically for mechanical parts. Type 2 format part numbers fall into 2 categories:
Assemblies consisting of 2 or more parts. Also used for Service manuals,
user guides and diagrams.
Assy parts and A/S privately used Parts can be distinguished by the part Code and Description.
They are always Type 2 format. The 2 leading characters indicate private or assembly parts.
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