In English

Publisher: Commodore Business Machines, Inc., November, 1986

Commodore PN-319907-01

REV.-A

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
1.4.2 CATX Control Board	1-17
1.4.3 COMI Circuit Board	1-18
1.4.4 Printer Mechanism	1-19
1.4.5 Housing	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
2.2.1 Filter Circuit	2-8
2.2.2 Power Transformer	2-8
2.2.3 Rectifier and Regulator Circuits	2-9
2.2.4 Vx Circuit	2-13
2.3 CATX BOARD OPERATION	2-14
2.3.1 Reset Circuit	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
2.3.5 Printhead Circuit	2-25
2.3.6 Buzzer Circuit	2-26
2.3.7 AD Converter	2-26
2.4 PRINTER MECHANISM OPERATION	2-28
2.4.1 Sensors	2-28
2.4.2 Carriage Mechanism	2-29
2.4.3 Paper Feed Mechanism	2-29
2.4.4 Printhead	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
4.2.1 Upper Case Removal	4-2
4.2.2 COMI Board Removal	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
4.2.6 Printhead Removal	4-5
4.2.7 Head Cable Removal	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
7.1.2 494 Regulator IC	7-7
7.1.3 SLA5040 COM	7-9
7.1.4 6116 Static RAM	7-11
7.1.5 Miscellaneus TTL and CMOS Devices	7-12
7.2 EXPLODED DIAGRAMS, SCHEMATICS AND PARTS LIST	7-14