This is the COMPLETE factory Service Repair Manual for the Samsung ML-4550 Series ML-4550 / ML-4551N / ML-4551ND / ML-4551NR / ML-4551NDR Digital 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
1.2.1 Toxic material
1.2.2 Electric Shock and Fire Safety Precautions
1.2.3 Handling Precautions
1.2.4 Assembly / Disassembly Precautions
1.2.5 Disregarding this warning may cause bodily injury
1.3 ESD Precautions
2. Product Specifications
2.1 Product Overview
2.2 Specifications
2.2.1 General Specifications
2.2.2 Controller & S/W
2.2.3 Paper Handling
2.2.4 Consumables
2.2.5 Reliability & Service
2.2.6 Environment
2.2.7 Options
2.2.8 Others
2.3 Model Comparison Table
3. Summary of Product
3.1 Printer Components
3.1.1 Front View
3.1.2 Rear View
3.1.3 Control Panel
3.2 System Layout
3.2.1 Feeding
3.2.2 Transfer
3.2.3 Driver Ass'y
3.2.4 Fuser
3.2.5 LSU (Laser Scanner Unit)
3.2.6 Print Cartridge
3.3 Engine H/W Specifications
3.3.1 ML-4550 (PCL) Main Board
3.3.2 SMPS & HVPS board
3.3.3 Engine F/W
4. Alignment and Adjustments
4.1 How to use EDC (Engine Diagnostic Control) Mode
4.1.1 EDC Setup
4.1.2 Entrance method for EDC
4.1.3 Cover Status
4.1.4 Sensor Status
4.1.5 Motor Test
4.1.6 Fan Test
4.1.7 Clutch / Sol
4.1.8 Fuser Ctrl
4.1.9 LSU
4.1.10 Deve Control
4.1.11 Print Test and Option version
4.2 Paper Path
4.2.1 Clearing Paper Jams
4.3 Sample Pattern
4.3.1 Information Pages
4.3.2 Demo Pages
4.4 Periodic Defective Image
4.5 Error Messages
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly
5.2 Transfer Roller
5.3 MPF Assy
5.4 Holder Pad Ass'y
5.5 Retard Ass'y
5.6 Feed2 Idle Unit
5.7 Cover Right
5.8 Main PBA
5.9 Main Drive Ass'y
5.10 DEVE Drive Ass'y
5.11 Connector PBA
5.12 Solenoid
5.13 Rear Cover
5.14 Cover Left
5.15 Top Cover
5.16 Open Cover
5.17 Inner Cover
5.18 Fuser Ass'y
5.19 Duplex Solenoid Ass'y
5.20 Exit Roller
5.21 LSU
5.22 DC Fan
5.23 Toner Sensor PBA
5.24 REGI Ass'y
5.25 MP Pick Up Ass'y
5.26 Pick Up & Feed2 Assy
5.27 Engine Shield
6. Troubleshooting
6.1 The cause and solution of Bad image
6.2 The cause and solution of the bad discharge
6.3 The cause and solution of the malfunction
6.4 Maintaining the toner cartridge
6.5 The cause and solutions of bad environment of the software
7. Exploded Views & Parts List
7.1 Main Assembly
7.2 Cover Assembly
7.3 Frame Assembly
7.4 Fuser Unit
7.5 REGI Assembly
7.6 Main Motor Assembly
7.7 Deve Motor Assembly
7.8 Exit Sorenoid Assembly
7.9 Cassette Assembly
7.10 Duplex Unit
7.11 SCF Unit
8. Block diagram
8.1 System Block Diagram
9. Connection Diagram
9.1 Connection Diagram
10. Schematic Diagram
10.1 Main Board
10.2 DIMM board
10.3 CRUM board
10.4 EMPTY board
10.5 HVPS
10.6 Panel
10.7 SCF
10.8 Toner sensor
10.9 https://www.tradebit.com
11. Reference Information
11.1 Troubleshooting Tools
11.2 Acronyms and Abbreviations
11.3 Select a location for the printer
11.4 Sample Tests Patterns

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Model Specification: Samsung ML-4550 Series ML-4550 / ML-4551N / ML-4551ND / ML-4551NR / ML-4551NDR Digital Laser Printer
Total Pages: 185
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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