Samsung ML-2550 / ML-2551N / ML-2552W Laser Printer Service Manual β PDF
$26.95
Samsung ML-2550 Series laser printer full service manual.
Includes disassembly, fuser and LSU repair, HVPS board, motor control, wiring, troubleshooting, and error recovery.
Detailed electrical diagrams, part lists, and adjustment data for ML-2550 / 2551N / 2552W models.
Description
Samsung ML-2550 / ML-2551N / ML-2552W Laser Printer Service Manual β PDF Download
DESCRIPTION
Overview
This Samsung ML-2550 Series Service Manual (ML-2550 / ML-2551N / ML-2552W) provides detailed technical and servicing information for field engineers, technicians, and repair professionals. It includes mechanical, electrical, and firmware data required to diagnose and restore printer operation, along with circuit diagrams and error codes.
IMAGES:
Major Sections
1οΈβ£ Safety & Precautions
Covers all safety warnings, laser radiation cautions, ESD handling, electrical shock hazards, and fuser high-temperature alerts. Explains correct disassembly methods and cable routing during reassembly
605555116-Samsung-ML-2550-Serviβ¦
2οΈβ£ Reference & Tools
Lists all diagnostic tools β digital voltmeter, tweezers, driver sets, spring hooks, and cleaning kits. Includes definitions for printer abbreviations such as LSU (Laser Scanner Unit), HVPS (High Voltage Power Supply), and SMPS (Switching Mode Power Supply)
605555116-Samsung-ML-2550-Serviβ¦
3οΈβ£ Specifications
Printing System: Non-magnetic single-component toner with electro-photographic process.
Speed: 24 ppm A4 / 25 ppm Letter.
Resolution: 1200Γ1200 effective DPI via interpolation.
Warm-up Time: 50s; First Page Out β€12s.
CPU: PowerPC 350 MHz; RAM 32 MB standard.
Interfaces: Parallel, USB 2.0, Ethernet, and optional Wi-Fi.
Paper Handling: A4 to Legal (duplex-capable).
Consumables: Toner cartridge (10,000-page yield), transfer/fuser rollers (100K/125K pages)
605555116-Samsung-ML-2550-Serviβ¦
4οΈβ£ Mechanical System
Paper Feeding: Controlled by BLDC main motor and solenoids. Uses retard roller and MP tray with friction pad feed.
Transfer & Fixing: Conductive roller transfer and pressure fuser lamp assembly. Thermistor-regulated heat control with three-level protection.
Toner Cartridge: Integrated OPC + developer unit, non-magnetic contact method, automatic toner level sensing.
Laser Scanner (LSU): Polygon mirror-based system synchronized via /HSYNC feedback for precise image alignment
605555116-Samsung-ML-2550-Serviβ¦
5οΈβ£ Electrical Systems
SMPS: 3.3V, 5V, and 24V DC outputs; includes AC heater triac control.
HVPS: Generates Β±4.2kV for transfer, -1.5kV for charge, -600V to -1200V for cleaning, and -470V for developing bias.
Protection: Zener diode -100V on OPC ground to prevent contamination in low-humidity environments
605555116-Samsung-ML-2550-Serviβ¦
Main Controller: SPGPv3 ASIC (ARM1020 core), SDRAM/Flash memory, ISP1582 USB-IC, and EEPROM. Supports PCL6, PCL5e, and PostScript 3.
6οΈβ£ Firmware & Engine Logic
Explains the drive sequence, feed timing, and jam detection (Jam0βJam2). Also defines fuser temperature thresholds, LSU synchronization errors, and diagnostic recovery codes.
7οΈβ£ Disassembly / Reassembly
Step-by-step mechanical disassembly for:
Transfer Roller, Fuser, MPF Assembly, Retard Assembly, Right/Left Covers, HVPS Board, LSU, SMPS, and Main PBA.
Includes alignment, torque values, and ESD-safe handling notes605555116-Samsung-ML-2550-Serviβ¦
8οΈβ£ Troubleshooting
Flowcharts for paper jams, image defects, fuser errors, LSU motor faults, and sensor failures. Voltage measurement tables, pin maps, and connector diagrams are included for logic-level verification.
9οΈβ£ Exploded Views & Parts List
Detailed exploded diagrams for engine assemblies, rollers, cartridge frame, and electrical boards with part numbers for each replaceable unit.
TECHNICAL HIGHLIGHTS
| Category | Details |
|---|---|
| Models Covered | ML-2550, ML-2551N, ML-2552W |
| Manual Type | Official Service Manual |
| Document Code | JC-0134A (Version 1.00, 2004) |
| Print Method | Laser Electrophotography |
| Processor | PowerPC 350 MHz |
| Memory | 32 MB (expandable up to 160 MB SDRAM DIMM) |
| Print Speed | 24 ppm (A4), 25 ppm (Letter) |
| Resolution | 600 Γ 600 dpi / 1200 Γ 1200 dpi effective output |
| Interface | IEEE1284 Parallel, USB 2.0, 10/100 Base-TX Ethernet (optional/standard depending on model) |
| Wireless LAN | IEEE 802.11b (ML-2552W standard, optional for others) |
| Warm-Up Time | β€ 50 seconds |
| First Print Time | β€ 12 seconds |
| Paper Input | 500-sheet cassette + 100-sheet MP tray (optional 2nd cassette) |
| Power Supply | 220β240V / 100β127V AC, 50/60 Hz |
| Power Consumption | 450W printing / 15W power-save mode |
| Main Components | LSU, HVPS/SMPS board, Fuser, Transfer Roller, OPC Drum, Main/Exit Motors |
| Sensors | Paper Feed, Exit, Toner Remaining, Cover Open, Temperature Thermistor |
| Safety Features | Laser shielding, overheat protection, auto power cut-off, ESD compliance |
| File Type | Searchable PDF |
| Page Count | ~178 pages |
| Language | English |
| Publisher | Samsung Electronics Co., Ltd. |
| Release Year | September 2004 |
FILE DETAILS
| File Name | 605555116-Samsung-ML-2550-Service-Manual.pdf |
|---|---|
| File Type | Searchable PDF |
| Pages | ~178 |
| Language | English |
| Version | 1.00 (September 2004) |
| File Size | ~15.2 MB |
| Format | Instant Download |
| Publisher | Samsung Electronics Co., Ltd. |
| Use | For professional service engineers and workshop technicians |
