Epson TM-U375 - Page 155

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6-8

Main Circuit

The main circuit for the TM-U375P is different from the below. See Chapter 7 for the

TM-U375P main circuit.

CONFIDENTIAL

Main Page

Default Chapter1
- Technical Manual1
- Table of Contents5
Chapter 116
Features16
General Specifications17
Printing Specifications17
Character Specifications17
Paper Specifications18
Paper Roll Supply Device21
Journal Paper Take-Up Mechanism21
Electrical Specifications21
Ribbon Cassette21
Dimensions, Weight, Finish21
Environmental Specifications21
Reliability22
Certifications22
Hardware Configuration23
Main Unit Configuration23
Main Unit Specifications24
- Paper Feed Motor24
- Carriage Motor24
- Print Head Unit (Print Solenoids)24
- Paper Roll Near-End Sensor24
- Cut Sheet Sensor (TOF/BOF Sensor)24
- Cover-Open Sensor24
- Home Position Sensor24
- Carriage Motor Out-Of-Phase State Sensor24
Connectors24
- Interface Connector25
- Power Supply Connector25
- Drawer Kick-Out Connector (Modular Connector)25
- Customer Display (DM-D) Connector (Modular25
- (Modular Connector)25
Interface26
Switches and Buttons28
- Power Switch28
- Operation Panel Buttons28
- Paper Load Switch28
- DIP Switches28
Indicators29
Functions29
Error Processing29
- Error Detection29
- Error Recovery29
- Data Receive Error29
Self-Test29
Hexadecimal Dumping30
- Hexadecimal Dumping Function30
- Starting Hexadecimal Dumping30
- Ending Hexadecimal Dumping30
Printing Operation30
- Sensors and Printing Operation30
- Buffer-Full Printing30
Other Functions30
- Paper Load30
- Paper Release30
Options31
AC Adapter (PS-150)31
- Specifications31
- Dimensions and Weight31
Display Device31
- DM-D101Ii, DM-D202Ii31
- DM-D102, DM-D20331
Chapter 232
- Carriage Feed Gear Train32
- Paper Feed Gear Train32
Printer Mechanism Components32
Printer Mechanism Operating Principles32
Transport Mechanism32
Printing Mechanism33
- Print Head Unit Movement34
- Wire Movement for Printing a Single Dot34
- Printing Operations Involved in Forming One Character34
- Platen Movement35
Detection Mechanism35
- Home Position Detection Mechanism35
- Carriage Motor Out-Of-Phase State Detection Mechanism36
- Cut Sheet Detection Mechanism36
- Paper Roll Near-End Detection Mechanism37
- Cover Open Detection Mechanism37
Paper Feed Mechanism37
- Paper Feed Operations37
- Paper Feed Component Mechanisms39
- Other Mechanisms41
Ribbon Feed Mechanism43
- Ribbon Feed Operation43
Paper Roll Take-Up Mechanism43
- Paper Roll Supply Mechanism43
- Paper Roll Take-Up Mechanism44
Electrical Circuitry Operating Principles45
Hardware Configuration45
- Component Connection Diagram45
- Circuit Block Diagram46
- Memory Map47
Principles of Operation47
- Power Supply Circuitry47
- Control Circuitry49
- Printer Mechanism Drive Control Circuit56
Chapter 363
- Storage Precautions63
- Use Precautions63
- Paper Handling Precautions63
- Ribbon Cassette Handling Precautions63
Handling63
Handling Precautions63
Transporting the Printer64
- Attaching the Transport Protective Materials64
Loading the Paper Roll64
Removing the Paper Roll66
Inserting Cut Sheet and Printing on Cut Sheet66
- Inserting Cut Sheet66
- Printing on Cut Sheet67
Installing and Removing the Ribbon Cassette67
- Installing the Ribbon Cassette67
- Removing the Ribbon Cassette68
Mounting the Power Switch Cover68
Removing the Jammed Paper68
Maintenance69
Periodic Checks69
Cleaning70
Lubrication70
Tool List71
Measuring Equipment List71
Lubricant List71
Chapter 472
- Initiating the Self-Test72
- Self-Test Standby72
- Ending the Self-Test72
Troubleshooting72
Self-Test72
Troubleshooting Flowchart73
- POWER LED Does Not Light74
- JOURNAL out LED Is Lit75
- ERROR LED Is Lit75
- ERROR LED Is Flashing76
- Paper Is Not Loaded by Pressing down Paper Load Switch76
- Self-Test Is Not Normal77
- Data from Host Is Not Printed Normally78
Troubleshooting Tables79
Major Part Replacement84
Fuse Replacement84
Print Head Unit Replacement84
J Guide Assembly B (Cutter Blade) Replacement84
Error Types and Countermeasures85
Chapter 587
Small Part Specifications87
Disassembly88
Removing the Fuse88
Removing the Print Head Unit89
Removing the J Guide Assembly B (Cutter Blade)90
Printer Mechanism Unit Assembly91
Component Parts91
Sub-Assembly93
- A FFC Guide Assembly93
- B Relay Circuit Board Assembly94
- C Carriage Assembly94
- D Paper Holding Lever Assembly95
- E Guide Frame Assembly B96
- F V Sensor Assembly96
- G Platen Holder Unit Assembly97
- H Ribbon Frame Assembly B102
- Print Frame Unit Assembly B103
Main Assembly110
- Paper Take-Up Drive Pulley a and Platen Holder Unit Attachment110
  - Linked Lever, and Fulcrum Shaft a and B Attachment111
  - Attachment112
- Intermediate Drive Roller Assembly and Guide Frame Assembly B Attachment112
- Lever-Release J Attachment113
- Guide Assembly B, C Feed Belt, and V Feed Roller Assembly Attachment114
- Solenoid-Platen Switching and Tension Lever Assembly Attachment115
- Solenoid-Paper Holding Switching Attachment116
- Feed Roller Assembly, Intermediate Holding117
  - Roller Assembly, and S Belt Attachment117
- Paper Guide (Upper) Attachment118
- Intermediate Gear B, Gear-Intermediate, Paper119
  - Shaft Attachment119
- Paper Feed Motor and Form Stopper Assembly Attachment120
- Sensor Assembly Attachment121
- Lead Wire Connection and Handling122
- Bottom Frame and Form Stopper Spring Attachment123
- Print Frame Unit B Attachment124
- Print Head Mask Assembly B Attachment125
Adjustments126
- Backlash126
- B Space Adjustment between the Linked Lever and Platen Holder127
- C Tension Lever Adjustment127
- D Platen Gap Adjustment128
Whole Unit Assembly129
Component Parts129
Sub-Assembly130
- B Pasting Caution Seals131
- C Main Circuit Board Unit132
- E Rubber Feet and Frame Ground Screw Attachment133
- F Switch Circuit Board Assembly and Sensor Circuit Board Assembly Attachment134
Main Assembly135
- Main Circuit Board Unit, Cables, and Cover-Circuit Board Attachment135
- E. Detector Unit Attachment136
- Plate-Base Assembly and Plate-Auxiliary Attachment137
- Paper Roll Receive Roller, J Paper Guide Roller, Power Switch Assembly, Detection Adjustment Screw, and Paper Take-Up Gear Assembly Attachment138
- Plate-Front Attachment to the Printer Mechanism Assembly139
- Printer Mechanism Assembly Attachment to the Case-Main140
- Attaching the Paper Take-Up Belt and Connecting the Cables141
- GND Plate Attachment142
- Switch Panel and Cover-Face Attachment143
- Document Table, Cover, and Paper Take-Up Shaft Assembly Attachment144
- Cover-ROM Attachment145
Adjustments146
- A Adjusting the Paper Roll Near-End Detector Position146
- B Head Duty Control Adjustment147
Chapter 7160
Features and General Specifications160
Connectors160
Interface160
DIP Switches163
Electrical Circuitry Operating Principles164
Component Connection Diagram164
Circuit Block Diagram165
Power Supply Circuitry165
Reset Circuit166
Cpu166
Gate Array167
Host Interface Circuit169
Drawer Kick-Out Drive Circuit169
Troubleshooting170
Assembly171
Whole Unit Sub-Assembly C171
Whole Unit Main Assembly 1172
Appendix173
Main Circuit Board Diagrams173

Epson TM-U375 - Page 155

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