Service manual
Table Of Contents
- Revision Table
- Introduction
- Chapter 1
- Features and General Specifications
- Chapter 2
- Mechanism Configuration and Operating Principles
- Printer Mechanism Operating Principles
- Print mechanism unit
- Print head unit movement
- Wire movement when a single dot is printed
- Printing a character (9x9 font)
- Paper Feed Mechanism Unit
- Paper loading (semi-automatic loading)
- Paper feeding
- Ribbon Feed Mechanism Unit
- Ribbon feeding
- Detection Mechanism Unit
- Home position detection mechanism
- Paper detection mechanism
- Paper roll near-end detection mechanism (optional)
- Auto-cutter mechanism
- Ribbon Switch Mechanism Unit
- Electrical Circuitry Operating Principles
- Principles of Operation
- Printer Mechanism Driver Circuits
- Printer Mechanism Operating Principles
- Chapter 3
- Handling and Maintenance
- Chapter 4
- Troubleshooting
- Chapter 5
- Disassembly, Assembly, and Adjustment
- Small Part Specifications
- Disassembly
- Sub-assembly A
- Main Assembly 1
- Main Assembly 2
- Main Assembly 3
- Main Assembly 4
- Main Assembly 5
- Main Assembly 6
- Main Assembly 7
- Main Assembly 8
- Main Assembly 9
- Main Assembly 10
- Main Assembly 11
- Main Assembly 12
- Main Assembly 13
- Main assembly 14
- Main Assembly 15
- Main Assembly 16
- Main Assembly 17
- Main Assembly 1 (Case Unit)
- Main Assembly 2 (Case Unit)
- Main Assembly 3 (Case Unit)
- Main Assembly 4 (Case Unit)
- Main Assembly 5 (Case Unit)
- Main Assembly 6 (Case Unit)
- Main Assembly 7 (Case Unit)
- Main Assembly 8 (Case Unit)
- Main Assembly 9 (Case Unit)
- Main Assembly 10 (Case Unit)
- Main Assembly 11 (Case Unit)
- Main Assembly 12 (Case Unit)
- Adjustment
- Appendix
- Appendix
- Addendum 1
- Main Circuit Board Types and Maintenance
- Addendum 2
- Lower Plate Change and ROM Spacer Abolition
- Addendum 3
- Auto-Cutter Release Tab Change

Rev. B vii
TM-U200 Series (Type B) Service Manual
Confidential
Main Assembly 7 (Case Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-37
Auto-cutter assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-37
Main Assembly 8 (Case Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-40
Paper roll receive rollers, upper case, guide roller, and switch panel assemblies 5-40
Main Assembly 9 (Case Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-43
Interface circuit board assembly and connector plate . . . . . . . . . . . . . . . . . . . 5-43
Main Assembly 10 (Case Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45
Lower plate, ROM cover, and rubber foot assembly . . . . . . . . . . . . . . . . . . . . 5-45
Main Assembly 11 (Case Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-46
Main cover assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-46
Main Assembly 12 (Case Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-47
Near-end detector assembly (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-47
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-50
Platen gap adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-50
Appendix
RS-485 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
XON/XOFF Transmission Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Data Format When Using RS-485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Parts Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Main circuit board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
RS-232 Serial Interface Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10
IEEE 1284 Parallel Interface Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11
RS-485 Serial Interface Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13
Main Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13
RS-232 Serial Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-18
IEEE 1284 Parallel Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-19
RS-485 Serial Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-20
Printer Mechanism Unit Overall Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . A-21
Case Unit Overall Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-22
Case Unit Overall Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-23
Printer Mechanism Unit Lubrication Points Diagram . . . . . . . . . . . . . . . . . . . . . . . A-24
Case Unit Lubrication Points Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-25
Addendum 1 Main Circuit Board Types and Maintenance
Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
EP-ROM equipped main circuit board no longer used in ANK font model 1
Number of switches in DIP switch set DSW2 changed in ANK font model 1
Function assignment of 8-switch DIP switch set DSW2 changed in ANK font model 2
Servicing Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Using the correct main circuit board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Using the correct DIP switch setting table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Using the correct circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Addendum 2 Lower Plate Change and ROM Spacer Abolition
Description of Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Servicing Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Addendum 3 Auto-Cutter Release Tab Change
Description of Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Assembly Procedure Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Spare Parts Supply Unit Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2