[Prev] [Next] [Up] [Main] [New] [Search] [Home]
Front page

Service Manual MPS-1000

In English
Commodore PN-319907-01
Publisher: Commodore Business Machines, Inc.
November, 1986


REV.-A

Table of Contents
 
CHAPTER 1. PRODUCT DESCRIPTION 
1.1 FEATURES1-1
1.2 SPECIFICATIONS1-2
1.3 INTERFACE OVERVIEW1-7
1.3.1 Commodore Serial Interface
1-7
1.3.2 Commodore Parallel Interface
1-11
1.4 MAIN COMPONENTS1-14
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 TEST1-21
1.6 DIP SWITCH AND JUMPER SETTINGS1-22
 
CHAPTER 2. PRINCIPLES OF OPERATION 
2.1 SIGNAL FLOW AND CONNECTOR PIN ASSIGNMENT2-1
2.2 POWER SUPPLY OPERATION2-7
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 OPERATION2-14
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 OPERATION2-28
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 INFORMATION4-1
4.2 DISASSEMBLY AND ASSEMBLY4-2
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 ADJUSTMENT4-16
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 PROCEDURE5-1
5.2 PROBLEM DIAGNOSIS BY SYMPTOM5-3
5.3 DIAGNOSIS BY COMPONENT EVALUATION5-11
5.4 PROBLEM DIAGNOSIS BY CIRCUIT EVALUATION5-22
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 MAINTENANCE6-1
6.2 LUBRICATION AND ADHESIVE APPLICATION6-1
 
CHAPTER 7. REFERENCE MATERIALS AND SCHEMATICS 
7.1 IC DESCRIPTIONS7-1
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 LIST7-14



[Prev] [Next] [Up] [Main] [New] [Search] [Home]
This page has been created by Sami Rautiainen.
Read the small print. Last updated Mar 11, 2007