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Samsung ML-4551NR User Manual

Samsung ML-4551NR
185 pages
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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
DIGITAL LASER PRINT
ML-4550 Series
ML-4550 / ML-4551N / ML-4551ND
Basic Model
:
ML-4550
ML-4551NR / ML-4551NDR

Table of Contents

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Samsung ML-4551NR Specifications

General IconGeneral
Printer TypeLaser
Print Speed45 ppm
Print Resolution1200 x 1200 dpi
Monthly Duty Cycle200, 000 pages
ConnectivityUSB, Ethernet
Duplex PrintingYes
Memory (Standard)128 MB
Processor Speed400 MHz

Summary

Precautions

Safety Warning

Essential safety guidelines for servicing, including high voltage and laser hazards.

Caution for safety

Covers toxic materials, electric shock, fire hazards, and general safety practices.

Handling Precautions

Instructions for safe personal handling to avoid injury and printer damage.

Assembly / Disassembly Precautions

Guidelines for careful part replacement, cable routing, and using approved components.

Disregarding this warning may cause bodily injury

Warnings about high temperature parts, rotating components, and printer weight.

ESD Precautions

Procedures to prevent damage to semiconductor devices from static electricity.

Product Specifications

Product Overview

A general introduction to the printer's purpose and target user.

Specifications

Detailed technical specifications including engine speed, resolution, and memory.

General Specifications

Specifics on engine speed, warmup time, FPOT, and resolution for different models.

Controller & S/W

Details on processor, memory, printer languages, drivers, and OS compatibility.

Paper Handling

Information on standard and optional paper trays, capacity, and media types.

Consumables

Details on toner and drum life span and yield.

Reliability & Service

Data on printing volume, monthly duty, MTBF, and MTTR.

Summary of Product

Engine H/W Specifications

Technical details of the printer's engine hardware components.

ML-4550 (PCL) Main Board

Description of the main board's function, CPU, and circuits for printer operation.

Sensor Input Circuit

Explanation of how various sensors (paper, cover) provide input to the CPU.

SMPS & HVPS board

Description of the Switch Mode Power Supply and High Voltage Power Supply boards.

HVPS (High Voltage Power Supply)

Detailed specifications for the high voltage outputs like transfer, fuser, and developing voltages.

SMPS (Switching Mode Power Supply)

Details on the power source, output channels, and power consumption.

Alignment and Adjustments

How to use EDC (Engine Diagnostic Control) Mode

Guide to using the Engine Diagnostic Control mode for testing printer functions.

EDC Setup

Explanation of the EDC mode's purpose and development for engineers.

Entrance method for EDC

Step-by-step instructions on how to enter the EDC mode for service.

Paper Path

Clearing Paper Jams

Detailed procedures for removing paper jams from various areas of the printer.

Error Messages

Disassembly and Reassembly

General Precautions on Disassembly

Important safety and procedural guidelines before starting disassembly.

Transfer Roller

Procedure for removing and replacing the transfer roller, with caution notes.

Main PBA

Procedure for removing the Main Printed Board Assembly.

Main Drive Ass'y

Steps for removing the main motor drive assembly and its gears.

DEVE Drive Ass'y

Procedure for removing the developer drive motor assembly.

Troubleshooting

Procedure of Checking the Symptoms

Flowchart for initial troubleshooting steps based on printer status and error messages.

The cause and solution of Bad image

Troubleshooting guide for common image quality issues like lines, spots, and density problems.

JAM 0

Solutions for paper jams occurring in the feeding area or when paper is not exited.

JAM 1

Troubleshooting steps for paper jams occurring in the fuser or discharge roller area.

JAM 2

Solutions for paper jams inside the fuser or when paper is accordion-folded.

Duplex Jam 1

Troubleshooting for jams related to duplex path sensor or paper reaching the duplex sensor.

Duplex Jam 0

Solutions for jams when paper cannot pass the duplex sensor or reach the registration sensor.

The cause and solution of the malfunction

Troubleshooting common hardware malfunctions like fuser, LSU, and motor errors.

Fuser Error

Solutions for 'Engine Fuser Low Heat Error' or 'Engine Fuser Over Heat Error'.

LSU Error

Troubleshooting steps for 'Engine Hsync Error' related to the Laser Scanning Unit.

Defective motor operation

Solutions for main motor malfunction causing paper feed issues (Jam 0).

No Power

Troubleshooting steps when no lamps illuminate on the operator panel after power on.

Replacing the toner cartridge

Step-by-step instructions for replacing an empty toner cartridge.

Exploded Views & Parts List

Block Diagram

Connection Diagram

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