Samsung ML ML-4551N Service Manual
Digital laser printer ml-4550 series
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Also See for ML ML-4551N:
- Manual del usuario (152 pages) ,
- User manual (113 pages) ,
- Solution manual (69 pages)
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SERVICE
DIGITAL LASER PRINT
DIGITAL LASER PRINT
ML-4550 Series
ML-4550 / ML-4551N / ML-4551ND
ML-4551NR / ML-4551NDR
Basic Model : ML-4550
Manual
[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
CONTENTS
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Table of Contents
Troubleshooting
Related Manuals for Samsung ML ML-4551N
Summarization of Contents
1. Precautions
1.1 Safety Warning
General safety guidelines for servicing and operating the printer.
1.2 Caution for safety
Specific safety precautions related to toxic materials and electrical hazards.
1.3 ESD Precautions
Guidelines for preventing damage from electrostatic discharge.
2. Product Specifications
2.1 Product Overview
General introduction to the printer's features and capabilities.
2.2 Specifications
Detailed technical specifications of the printer.
2.3 Model Comparison Table
Comparison of the printer with other models.
3. Summary of Product
3.1 Printer Components
Identification and description of the printer's main physical parts.
3.2 System Layout
Diagram illustrating the internal arrangement of printer components.
4. Alignment and Adjustments
4.1 How to use EDC (Engine Diagnostic Control) Mode
Instructions for using the diagnostic mode for testing and maintenance.
4.2 Paper Path
Description and diagrams of the paper's path through the printer.
4.3 Sample Pattern
Information on printing sample patterns for maintenance checks.
4.4 Periodic Defective Image
Identifying image defects caused by roller issues.
4.5 Error Messages
List of error messages and their meanings/solutions.
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly
Important safety and handling precautions before disassembling the printer.
5.2 Transfer Roller
Procedure for removing and replacing the transfer roller.
5.3 MPF Ass’y
Steps for disassembling the Multi-Purpose Feeder assembly.
6. Troubleshooting
6.1 Procedure of Checking the Symptoms
A systematic approach to diagnosing printer problems.
6.2 The cause and solution of Bad image
Troubleshooting common image quality defects.
6.2.1 Vertical Black Line and Band
Diagnosing and fixing vertical lines or bands in prints.
6.2.2 Vertical White Line
Diagnosing and fixing vertical white lines or voids in prints.
6.2.3 Horizontal Black Band
Diagnosing and fixing horizontal stripes in prints.
6.2.4 Black/White Spot
Diagnosing and fixing black or white spots in prints.
6.2.5 Light Image
Troubleshooting light printed images.
6.2.6 Dark Image or a Black Page
Troubleshooting dark images or entirely black pages.
6.2.7 Uneven Density
Addressing uneven print density across the page.
6.2.8 Background
Troubleshooting light dark backgrounds in prints.
6.2.9 Ghost (1)
Diagnosing and fixing ghosting artifacts in prints.
6.2.10 Ghost (2)
Further troubleshooting of ghosting artifacts.
6.2.11 Ghost (3) : Fuser
Ghosting issues specifically related to the fuser.
6.2.12 Stains on the Face of Page
Troubleshooting stains on the printed page.
6.2.13 Stains on the Back of Page
Troubleshooting stains on the back of the printed page.
6.2.14 Blank Page Print out (1)
Diagnosing blank pages during printing (Issue 1).
6.2.15 Blank Page Print out (2)
Diagnosing blank pages during printing (Issue 2).
6.3 The cause and solution of the bad discharge
Correcting incorrect print positioning on the paper.
6.3.1 Wrong Print Position
Correcting incorrect print positioning on the paper.
6.3.2 JAM 0
Troubleshooting paper jam error code 0.
6.3.3 JAM 1
Troubleshooting paper jam error code 1.
6.3.4 JAM 2
Troubleshooting paper jam error code 2.
6.3.5 Duplex Jam 1
Troubleshooting duplex paper jam error code 1.
6.3.6 Duplex Jam 0
Troubleshooting duplex paper jam error code 0.
6.3.7 Multi-Feeding
Resolving issues where multiple sheets feed at once.
6.3.8 Paper rolled in the fuser
Troubleshooting paper jams within the fuser unit.
6.3.9 Paper rolled on the OPC Drum
Troubleshooting paper wrapped around the OPC drum.
6.4 The cause and solution of the malfunction
Troubleshooting specific fuser errors.
6.4.1 Fuser Error
Troubleshooting specific fuser errors.
6.4.2 LSU Error
Troubleshooting errors related to the Laser Scanner Unit (LSU).
6.4.3 Not function of the gear of the fuser due to melting away
Fuser gear failure due to melting.
6.4.4 Paper Empty
Troubleshooting the "Paper Empty" indication.
6.4.5 Paper Empty without indication
Paper empty issues without an indication.
6.4.6 Cover Open
Troubleshooting "Cover Open" errors.
6.4.7 No error message when the cover is open
Cover open status not being reported.
6.4.8 Defective motor operation
Troubleshooting motor operation failures.
6.4.9 No Power
Troubleshooting the printer not powering on.
6.4.10 Vertical Line Getting Curved
Fixing curved vertical lines during printing.
6.5 Maintaining the toner cartridge
Guidelines for storing toner cartridges properly.
Toner cartridge storage
Guidelines for storing toner cartridges properly.
Expected cartridge life
Information on the expected lifespan of toner cartridges.
Saving toner
How to use the toner saving feature.
6.5.1 Checking the remaining toner
How to check the current toner level.
6.5.2 Redistributing toner cartridge
Procedure to redistribute toner for better print quality.
6.5.3 Replacing the toner cartridge
Step-by-step guide to replacing the toner cartridge.
6.5.4 Toner Cartridge-related messages
Explanations for toner cartridge related error messages.
6.6 The cause and solutions of bad environment of the software
Troubleshooting software-related issues when the printer is not working.
6.6.1 The printer is not working (1)
Troubleshooting software-related issues when the printer is not working.
6.6.2 The printer is not working (2)
Further software troubleshooting for printer non-responsiveness.
6.6.3 Abnormal Printing
Troubleshooting printing errors caused by software or setup.
6.6.4 SPOOL Error
Troubleshooting spooler errors affecting printing.
7. Exploded Views and Parts List
7.1 Main Assembly
Exploded view and parts list for the main printer assembly.
7.2 Cover Assembly
Exploded view and parts list for printer covers.
7.3 Frame Assembly(1/2)
Exploded view and parts list for printer frame components (Part 1).
7.3 Frame Assembly(2/2)
Exploded view and parts list for printer frame components (Part 2).
7.4 Fuser Unit
Exploded view and parts list for the fuser unit.
7.5 REGI Assembly
Exploded view and parts list for the REGI assembly.
7.6 Main Motor Assembly
Exploded view and parts list for the main motor assembly.
7.7 Deve Motor Assembly
Exploded view and parts list for the deve motor assembly.
7.8 Duplex Solenoid Assembly
Exploded view and parts list for the duplex solenoid assembly.
7.9 Cassette Assembly
Exploded view and parts list for the cassette assembly.
7.10 Duplex Unit
Exploded view and parts list for the duplex unit.
7.11 SCF Unit
Exploded view and parts list for the SCF unit.
8. Block Diagram
8.1 System Block Diagram
Diagram illustrating the overall system architecture and component interactions.
9. Connection Diagram
9.1 Connection Diagram
Diagrams showing electrical connections between printer components.
11. Reference Information
11.1 Tool for Troubleshooting
List of tools recommended for troubleshooting the printer.
11.2 Acronyms and Abbreviations(1)
Glossary of abbreviations and acronyms used in the manual.
11.2 Acronyms and Abbreviations(2)
Continued glossary of abbreviations and acronyms.
11.3 Select a location for the printer
Guidelines for choosing an optimal location for printer installation.
11.4 Sample Tests Patterns
Examples of standard test patterns used for factory calibration.
11.5 LAN (Optional Function)
Information on using the printer with a wired LAN connection.
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