Table of Contents |
CHAPTER 1. PRODUCT DESCRIPTION | |
1.1 FEATURES | 1-1 |
1.2 SPECIFICATIONS | 1-2 |
1.3 INTERFACE OVERVIEW | 1-7 |
1.3.1 Commodore Serial Interface |
| 1-7 |
1.3.2 Commodore Parallel Interface |
| 1-11 |
1.4 MAIN COMPONENTS | 1-14 |
1.4.1 Power Supply Circuits |
| 1-15 |
| 1-17 |
| 1-18 |
| 1-19 |
| 1-20 |
1.5 SELF TEST | 1-21 |
1.6 DIP SWITCH AND JUMPER SETTINGS | 1-22 |
|
CHAPTER 2. PRINCIPLES OF OPERATION | |
2.1 SIGNAL FLOW AND CONNECTOR PIN ASSIGNMENT | 2-1 |
2.2 POWER SUPPLY OPERATION | 2-7 |
| 2-8 |
| 2-8 |
2.2.3 Rectifier and Regulator Circuits |
| 2-9 |
| 2-13 |
2.3 CATX BOARD OPERATION | 2-14 |
| 2-14 |
2.3.2 Data Input and Decoding |
| 2-15 |
2.3.3 Carriage Motor Control Circuit |
| 2-18 |
2.3.4 Paper Feed Motor Control Circuit |
| 2-23 |
| 2-25 |
| 2-26 |
| 2-26 |
2.4 PRINTER MECHANISM OPERATION | 2-28 |
| 2-28 |
| 2-29 |
2.4.3 Paper Feed Mechanism |
| 2-29 |
| 2-31 |
2.4.5 Ribbon Drive Mechanism |
| 2-31 |
|
CHAPTER 3. OPTIONAL EQUIPMENT | |
|
CHAPTER 4. DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT | |
4.1 GENERAL REPAIR INFORMATION | 4-1 |
4.2 DISASSEMBLY AND ASSEMBLY | 4-2 |
| 4-2 |
| 4-2 |
4.2.3 CATX Circuit Board Removal |
| 4-3 |
4.2.4 Power Transformer Removal |
| 4-4 |
4.2.5 Filter Circuit Board Removal |
| 4-5 |
| 4-5 |
| 4-6 |
4.2.8 Home Position Sensor Removal |
| 4-6 |
4.2.9 Paper End Sensor Removal |
| 4-6 |
4.2.10 PTS Sensor Removal |
| 4-7 |
4.2.11 Carriage Motor Removal |
| 4-8 |
4.2.12 Paper Feed Motor Removal |
| 4-8 |
4.2.13 Paper Feed Mechanism Removal |
| 4-9 |
4.2.14 Paper Guide Auxiliary Removal |
| 4-11 |
4.2.15 Timing Belt Removal |
| 4-11 |
4.2.16 Printer Circuit Board Removal |
| 4-12 |
4.2.17 Sprochet Unit Disassembly |
| 4-13 |
4.3 ADJUSTMENT | 4-16 |
4.3.1 Paper Feed Motor Backlash Adjustment |
| 4-16 |
4.3.2 Carriage Motor Backlash Adjustment |
| 4-16 |
4.3.3 Timing Belt Tensions Adjustment |
| 4-17 |
4.3.4 PTS Sensor Adjustment |
| 4-18 |
4.3.5 Carriage Guide Plate Adjustment |
| 4-18 |
4.3.6 Printhead Gap Adjustment |
| 4-19 |
|
CHAPTER 5. TROUBLESHOOTING | |
5.1 TROUBLESHOOTING PROCEDURE | 5-1 |
5.2 PROBLEM DIAGNOSIS BY SYMPTOM | 5-3 |
5.3 DIAGNOSIS BY COMPONENT EVALUATION | 5-11 |
5.4 PROBLEM DIAGNOSIS BY CIRCUIT EVALUATION | 5-22 |
5.4.1 Troubleshooting the CATX cirucit Board |
| 5-22 |
5.4.2 Troubleshooting the Printer Mechanism |
| 5-41 |
|
CHAPTER 6. MAINTENANCE | |
6.1 PREVENTIVE MAINTENANCE | 6-1 |
6.2 LUBRICATION AND ADHESIVE APPLICATION | 6-1 |
|
CHAPTER 7. REFERENCE MATERIALS AND SCHEMATICS | |
7.1 IC DESCRIPTIONS | 7-1 |
7.1.1 7810/7811 Microprocessor |
| 7-2 |
| 7-7 |
| 7-9 |
| 7-11 |
7.1.5 Miscellaneus TTL and CMOS Devices |
| 7-12 |
7.2 EXPLODED DIAGRAMS, SCHEMATICS AND PARTS LIST | 7-14 |