This is the COMPLETE factory Service Repair Manual for the Samsung ML-4550 Series ML-4551N/XAZ Laser Printer. This Service Manual has easy-to-read text sections with top quality diagrams and instructions as well as step-by-step instructions for repairing your SAMSUNG machine. it makes it easy for you to learn technical theory, installation, maintenance, troubleshooting, disassembly, assembly and repair of SAMSUNG products.

This Manual Covers:
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1. Precautions
1.1 Safety Warning
1.2 Caution for safety
1.3 ESD Precautions
2. Product spec and feature
2.1 Product Specifications
2.1.1 Product Overview
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
3.2 Transfer Roller
3.3 MPF Assy
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
3.13 Rear Cover
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
4.1.1 How to use EDC (Engine Diagnostic Control) Mode
4.1.2 Paper Path
4.1.3 Sample Pattern
4.1.4 Periodic Defective Image
4.1.5 Error Messages
4.2 Troubleshooting
4.2.1 Procedure of Checking the Symptoms
4.2.2 The cause and solution of Bad image
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
5. Exploded Views & Parts List
5.1 Main Assembly
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
6.2 SCX-4200 Connection Diagram
7. Reference Information
7.1 Troubleshooting Tools
7.2 Acronyms and Abbreviations
7.3 Select a location for the printer
7.4 Sample Tests Patterns

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Model Specification: Samsung ML-4550 Series ML-4551N/XAZ Laser Printer
Total Pages: 172
File Format: PDF
Requirements: Adobe PDF Reader
Language: English
Compatible: All Versions of Windows & Mac, APP ISO, Iphone, Ipad, Android etc...

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This manual is in PDF format, This is an original Adobe document which equals Perfect Quality and Perfect Printing. The PDF can be searched quickly to find what you need to know in every Chapter. You can print the Entire manual or ANY Pages you want to select. You can also Zoom in on any Diagram or Picture to easily SEE EVERY PART.

Save time and money by doing your own repairs! This manual makes any repair job easy to do with very easy to follow step-by-step instructions & pictures on all areas of repair.

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