Samsung SCX-4021S 4521FS 4521NS 4521HS Printer Service Manual and Repair Guide

This official service manual for the Samsung SCX-4021S 4521FS 4521NS 4521HS Multifunction laser printer is an essential resource for troubleshooting and repairing your printer. It is used by Official Certified Samsung Technicians and provides detailed instructions and precautions for safe repair.

The manual includes the following contents:

• Precautions
  • Safety warning
  • Caution for safety
    • Toxic material
    • Electric shock and fire safety precautions
    • Handling precautions
    • Assembly and Disassembly precautions
    • Disregarding this warning may cause bodily injury
  • ESD precautions
• Product specification and description
  • Product Specification
    • Product Overview
    • Specifications
      • General Print Engine
      • Copier
      • Scan Specification
      • Fax (SCX-465xF_465xFN_465xHN_4521FS_4521NS_4521HS)
      • Controller and Software
      • Paper Handling
      • Supplies
      • Maintenance Part
      • Reliability and Service
      • Environment
    • Model Comparison Table
  • System Overview
    • Front View
    • Rear View
    • Paper Path
    • System Layout
      • Feeding Part
      • Transfer Roller
      • Drive Unit
      • Fuser Unit
      • LSU (Laser Scanner Unit)
      • Toner Cartridge
    • Hardware configuration
      • Main board
      • OPE board
      • Fax board (4in-1 model only)
      • SMPS/HVPS board
      • Electrical Parts Location
    • Engine F/W Contol Algorithm
      • Feeding
      • Transfer
      • Fusing
      • LSU
    • Software Descriptions
      • Software system overview
      • Architecture
      • Data and Control Flow
• Disassembly and Reassembly
  • Precautions when replacing parts
    • Precautions when assembling and disassembling
    • Precautions when handling PBA
    • Releasing Plastic Latches
  • Screws used in the printer
  • Replacing the Main SVC parts
    • Cover
    • OPE Unit
    • Scanner Unit
    • ADF unit
    • CIS (Contact Image Sensor) Unit
    • Middle Cover
    • Main board
    • Fax board
    • SMPS_HVPS board
    • Fuser Unit
    • Transfer roller
    • LSU
    • Feed Sensor PBA
    • Main Drive Unit
    • Pick Up Solenoid
    • Pick up roller
• Alignment and Troubleshooting
  • Alignment and Adjustments
    • Control Panel
    • Understanding the status LED
    • JAM remova
      • Clearing original document jams
      • Clearing paper jams
    • Useful menu item for service
    • Periodic Defective Image
    • Useful management tools
      • Using Samsung Easy Printer Manager
      • Using Samsung Printer Status
      • Using SyncThru Web Service (SWS)
    • Updating Firmware
      • Update the firmware by using the USB port
      • Update the firmware by using the network
    • Tech mode
  • Troubleshooting
    • Procedure of checking the symptoms
      • Basic Check List
    • Error Code and Troubleshooting
    • Image quality problem
    • Other errors
• System Diagram
  • Block Diagram
  • Connection Diagram
• Reference Information
  • Tool for Troubleshooting
  • Glossary
  • The Sample Pattern for the Test
• Exploded Views & Parts List Catalog

This high-resolution manual provides colored pictures and step-by-step instructions for repairing and servicing the printer. It is available in PDF format, ensuring instant access without any shipping fees or waiting time. The manual is in English and compatible with Windows and MAC platforms.

Get your repairs, service, and maintenance jobs done the right way with this comprehensive service manual!