Service manual

ManualsBrandsEpson ManualsComputer equipmentTM U200D - B/W Dot-matrix Printer

Table Of Contents

Revision Table
- Key to Symbols
- Safety Precautions on Maintenance/Repair/Inspection
- Modular Connector
- CONTENTS
Introduction
Chapter 1
Features and General Specifications
- Features
- Hardware Configuration
- Main Unit Specifications
- Connectors
- Interface
- Buttons and Switches
- Panel LEDs
- Self-test
- Error Processing
  - Printer Operation When an Error Occurs
  - Data Receive Error
- Buffer Full Printing
- Detectors and Printing
- Hexadecimal Dump
  - Performing a Hexadecimal Dump
- Options
  - External Power Supply PS-170
Chapter 2
Mechanism Configuration and Operating Principles
- Printer Mechanism Operating Principles
- Ribbon Switch Mechanism Unit
  - Switching from Black to Red
  - Releasing from Red to Black
- Electrical Circuitry Operating Principles
  - Hardware Configuration
- Principles of Operation
- Printer Mechanism Driver Circuits
Chapter 3
Handling and Maintenance
- Handling Precautions
- Replacing the Paper Roll
- Replacing the Ribbon Cassette
- Removing Jammed Paper
- Using the Power Switch Cover
- Inspection and Maintenance
  - Maintenance Procedures
- Cleaning
- Lubricants
- Tool List
Chapter 4
Troubleshooting
- Self-test
- Troubleshooting Flowchart
- Troubleshooting Tables
- Error Types and Countermeasures
Chapter 5
Disassembly, Assembly, and Adjustment
- Small Part Specifications
- Disassembly
  - Removing the fuse
- Sub-assembly A
  - Paper feed frame unit assembly
- Main Assembly 1
  - Ribbon switch lever, ribbon release spring, ribbon release lever, ribbon intermediate gear, ribbo...
- Main Assembly 2
  - Tension plate assembly
- Main Assembly 3
  - Paper feed frame assembly
- Main Assembly 4
  - Carriage motor assembly
- Main Assembly 5
  - Carriage sub assembly
- Main Assembly 6
  - Carriage shaft assembly
- Main Assembly 7
  - Adjustment roller shaft holder assembly
- Main Assembly 8
  - Carriage guide shaft assembly
- Main Assembly 9
  - Belt tension spring assembly
- Main Assembly 10
  - Sensor assembly
- Main Assembly 11
  - Carriage motor heat sink assembly
- Main Assembly 12
  - Print head FPC assembly
- Main Assembly 13
  - Print head unit
- Main assembly 14
  - Left cover fixing plate and right cover fixing plate
- Main Assembly 15
  - Ribbon frame earth plate
- Main Assembly 16
  - Ribbon frame assembly, ribbon frame spring, and ribbon frame fixing plate
- Main Assembly 17
  - Thumb-screw and head cover
- Main Assembly 1 (Case Unit)
  - Lower cutter plate assembly
- Main Assembly 2 (Case Unit)
  - Upper plate assembly
- Main Assembly 3 (Case Unit)
  - Main circuit board assembly
- Main Assembly 4 (Case Unit)
  - Inserting the cables
- Main Assembly 5 (Case Unit)
  - Lower case assembly
- Main Assembly 6 (Case Unit)
  - Manual cutter assembly and auto-cutter fixing plate
- Main Assembly 7 (Case Unit)
  - Auto-cutter assembly
- Main Assembly 8 (Case Unit)
  - Paper roll receive rollers, upper case, guide roller, and switch panel assemblies
- Main Assembly 9 (Case Unit)
  - Interface circuit board assembly and connector plate
- Main Assembly 10 (Case Unit)
  - Lower plate, ROM cover, and rubber foot assembly
- Main Assembly 11 (Case Unit)
  - Main cover assembly
- Main Assembly 12 (Case Unit)
  - Near-end detector assembly (optional)
- Adjustment
  - Platen gap adjustment
  - Removing the print head unit
  - Removing the auto-cutter
  - Removing the main circuit board assembly
Appendix
- RS-485 Serial Interface
  - XON/XOFF Transmission Timing
  - Data Format When Using RS-485
- Parts Layout
Appendix
- Circuit Diagrams
- Printer Mechanism Unit Overall Exploded Diagram
- Case Unit Overall Exploded Diagram
- Case Unit Overall Exploded Diagram
- Printer Mechanism Unit Lubrication Points Diagram
- Case Unit Lubrication Points Diagram
Addendum 1
Main Circuit Board Types and Maintenance
- Changes
- Servicing Precautions
Addendum 2
Lower Plate Change and ROM Spacer Abolition
- Description of Change
- Servicing Precautions
Addendum 3
Auto-Cutter Release Tab Change
- Description of Change
- Assembly Procedure Change
- Spare Parts Supply Unit Change

Rev. B Mechanism Configuration and Operating Principles 2-13

TM-U200 Series (Type B) Service Manual

Confidential

Circuit board block diagram

The main circuit board unit contains the following electrical circuits:

❏

Power supply circuit

❏

Reset circuit

❏

CPU [internal RAM: 16K bits (2K x 8 bits)]

❏

Memory [EPROM 512K bits (64K x 8 bits) or flash memory (4M bits/8M bits) ]

❏

Operation panel control circuit

❏

Drawer kick-out driver circuit

❏

Print head driver circuit

❏

Paper feed motor driver circuit

❏

DIP switch read circuit

❏

Various detector circuits

❏

Carriage motor driver circuit

❏

Auto-cutter driver circuit

The interface circuit board contains the following:

❏

Reset circuit

❏

Host interface circuit