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

2-24 Mechanism Configuration and Operating Principles Rev. B

Confidential

CPU (U5) pins 52 to 55, pins 56 to 59, and pins 1 and 80 are also used for the carriage motor drive

circuit, paper feed motor drive circuit, and operation panel control circuit. The pins are used to

read DIP switches temporarily immediately after the printer initialization (or the power is

turned on).

(*1): Resistance between E and B is used for pull-up resistors in the transistor.

Figure 2-24 DIP switch read circuit

＋5V

P20

P21

P22

P23

P90

P91

P92

P93

12345 768

DSW1

D24 D23 D22 D21 D20 D19 D18 D17

Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q36 Q35

D14 D25

DSW2

P57

P56

R33

＋5 V

Q39

Q28

Q38

R32

＋5 V

R29

＋5 V

P100

P101

(＊1)

+5V