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Make/Model Information:

  • Brand:   Samsung
  • Models included:
    • Samsung Laser ML-4550
    • Samsung Laser ML-4551N
    • Samsung Laser ML-4551ND
    • Samsung Laser ML-4551NDG

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English
  • Number of pages:   201
  • File size:  ∼ 21.41  MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   BMSG-1021

NOTE:  This list was created by program script and may not accurately represent the text from the source pages.   For full preview please click on 'Download sample':

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DIGITAL LASER PRINT CONTENTS
[The keynote of Product]
- Series Model: ML-4550 / 4551N / 4551ND
- High speed Laser Printer:
Up to 43 ppm in A4 (45 ppm in Letter),
Duplex: 29 ipm (A4); 30 ipm (Letter)
- Resolution: Up to 1200 x 1200 dpi
- Marvell 500Mhz
- Memory: 128 MB (Max. 512 MB)
128, or 256 MB optional memory available.
Use only the Samsung-approved DIMM.
128 MB: ML-MEM150, 256 MB: ML-MEM160
- Option:
ML-4550:500-sheet trays, ethernet 10/100 Base
TX wired LAN, ethernet 10/100 Base
hard disk, duplex unit, DIMM
- Toner cartridge:
Starter: 10K or 20K pages
Consumable: 10K or 20K pages
- Duty cycle: Monthly Up to 150,000 pages
Manual SERVICE
Basic Model : ML-4550
ML-4551NR/XEV
1. Precautions
1.1 Safety Warning 1-1
1.2 Caution for safety
1.3 ESD Precautions
2. Product spec and feature
2.1 Product Specifications 2-1
2.1.1 Product Overview 2-1
2.1.2 Specifications
2.1.3 Model Comparison Table
2.2 Summary of Product
2.2.1 Printer Components
2.2.2 System Layout
2.2.3 Engine H/W Specifications
3. Disassembly and Reassembly
3.1 General Precautions on Disassembly 3-1
3.2 Transfer Roller
3.3 MPF Ass’y
3.4 Holder Pad Ass'y
3.5 Retard Ass'y
3.6 Feed2 Idle Unit
3.7 Cover Right
3.8 Main PBA
3.9 Main Drive Ass'y
3.10 DEVE Drive Ass'y
3.11 Connector PBA
3.12 Solenoid
Contents
3.13 Rear Cover 3-13
3.14 Cover Left
3.15 Top Cover
3.16 Open Cover
3.17 Inner Cover
3.18 Fuser Ass'y
3.19 Duplex Solenoid Ass'y
3.20 Exit Roller
3.21 LSU
3.22 DC Fan
3.23 Toner Sensor PBA
3.24 REGI Ass'y
3.25 MP Pick Up Ass'y
3.26 Pick Up & Feed2 Assy
3.27 Engine Shield
4. Alignment & Troubleshooting
4.1 Alignment and Adjustments 4-1
4.1.1 How to use EDC (Engine Diagnostic Control) Mode 4-1
4.1.2 Paper Path
4.1.3 Sample Pattern
4.1.4 Periodic Defective Image
4.1.5 Error Messages
4.2 Troubleshooting 4-22
4.2.1 Procedure of Checking the Symptoms
4.2.2 The cause and solution of Bad image 4-23
4.2.3 The cause and solution of the bad discharge
4.2.4 The cause and solution of the malfunction
4.2.5 Maintaining the toner cartridge
4.2.6
The cause and solutions of bad environment of the software 4-65
Continued
5. Exploded Views & Parts List
5.1 Main Assembly 5-2
5.2 Cover Assembly
5.3 Frame Assembly
5.4 Fuser Unit
5.5 REGI Assembly
5.6 Main Motor Assembly
5.7 Deve Motor Assembly
5.8 Exit Sorenoid Assembly
5.9 Cassette Assembly
5.10 Duplex Unit
5.11 SCF Unit
6. System Diagram
6.1 Block Diagram 6-1
6.2 SCX-4200 Connection Diagram
7. Reference Information
7.1 Troubleshooting Tools 7-1
7.2 Acronyms and Abbreviations
7.3 Select a location for the printer
7.4 Sample Tests Patterns
Continued
Adjustment and Troubleshooting
Service Manual 4-1 Samsung Electronics
4. Adjustment and Troubleshooting
4.1 Alignment and Adjustments
4.1.1 How to use EDC (Engine Diagnostic Control) Mode
4.1.1.1 EDC Setup
EDC(Engine Diagnostic Control, EDC will be used below) is considered to test and check whether each functions of
machinery and h/w module are normal or not. All of the test function are able to be controlled by the keys and LCD
window on the panel without any other kits. It’s developed for related engineers, not for users.
4.1.1.2 Entrance method for EDC
In order to enter the EDC mode, the entering method should be special because this mode is developed for engineers
related, not for end users.
- Entering the mode, the message,
COMPONENT TEST/Press Menu Key is displayed.
- In this mode, an engineer should press the Menu Key to search each function he would like to test.
Usage
1. Check printer is powered on.
2. Wait until the printer becomes a ready mode.
3. Press
Menu -> Stop -> Left -> Back -> Ok -> Right in order.
4. Confirm the message COMPONENT TEST/Press Menu Key is displayed.
5. Press Menu key.
6. Follow a usage for a function you would like to use.
* The procedure and content above can be changed according to the situation.
Exploded Views & Parts List
Service Manual 5-1 Samsung Electronics
5. Exploded Views and Parts List (ML-4551NR/XEV)
5.1 Main Assembly 5-2
5.2 Cover Assembly
5.3 Frame Assembly
5.4 Fuser Unit
5.5 REGI Assembly
5.6 Main Motor Assembly
5.7 Deve Motor Assembly
5.8 Exit Sorenoid Assembly
5.9 Cassette Assembly
5.10 Duplex Unit
5.11 SCF Unit
Contents Contents
DIGITAL LASER PRINT The keynote of Product
[The keynote of Product]
- Series Model: ML-4550 / 4551N / 4551ND
- High speed Laser Printer:
Up to 43 ppm in A4 (45 ppm in Letter),
Duplex: 29 ipm (A4); 30 ipm (Letter)
- Resolution: Up to 1200 x 1200 dpi
- Marvell 500Mhz
- Memory: 128 MB (Max. 512 MB)
128, or 256 MB optional memory available.
Use only the Samsung-approved DIMM.
128 MB: ML-MEM150, 256 MB: ML-MEM160
- Option:
ML-4550:500-sheet trays, ethernet 10/100 Base
TX wired LAN, ethernet 10/100 Base
hard disk, duplex unit, DIMM
- Toner cartridge:
Starter: 10K or 20K pages
Consumable: 10K or 20K pages
- Duty cycle: Monthly Up to 150,000 pages


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