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Zenith Manuals
Monitor
ZVM-131
Service manual
Zenith ZVM-131 Service Manual
Color video monitors
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Characteristics
Description
Controls, Indicators, and Connectors
And ZVM-135
Monitor Front View
And ZVM-136
ZVM-131 Specifications
Specifications
ZVM-135 Specifications
Installation
ZVM-131 and ZVM-135 Installation
Composite Signal
RGB Signal
ZVM-133 and ZVM-136 Installation
Circuit Descriptions
ZVM-131 and ZVM-135 Circuit Boards
Main Board
Start-Up and Operating Voltages
Degaussing Circuit
Power Supplies
150 VDC Supply
VDC Supply
RGB Drive and Cutoff Voltages
Composite Drive
Composite Vertical Sync
Composite Horizontal Sync
Horizontal and Vertical Drive Outputs
Audiolvideo Sync Board
High Voltage and Horizontal Sweep Board
Width Step Board
Video Output Board
ZVM-133 and ZVM-136 Circuit Boards
RGB Gain Control Board
RGB Input Signal
RGBI Input
Servicing
Safety and Service Guidelines
AC Leakage Test
And ZVM-135 Controls and Connectors. 11 3. ZVM-133 and ZVM-136 Controls and Connectors. 12 4. AC Leakage Voltmeter Circuit
Other Precautions
Suggested Tools and Supplies
Test Equipment
Troubleshooting
General Troubleshooting
Fault Isolation Procedures
Alignments and Adjustments
Main Board Adjustments
RGB Cutoff and G2 Adjustments
RGB Drive Adjustments
Vertical Center and Vertical Height Adjustments
Horizontal Center and Width Adjustments
Main Board Adjustment
High Voltage and Sweep Boardlwidth Step Board Ad- Justments
Horizontal Oscillator Adjustment
Volt Adjustment
Sweep Assembly Adjustments
Focus Adjustment
Width Selection
Audionideo Sync Board Adjustments
Chroma Null Phase Adjustment
BLUE and RED Cutoff Adjustments
Audionideo Sync Board Adjustments
Cleaning Procedure
Performance Tests
Fill the Screen Test
Color Bar Test
BASIC Program
BASIC Color Bar Program
Servicing Diagrams
Block Diagram ZVM-131 and ZVM-135
Block Diagram ZVM-133 and ZVM-136
Audionideo Sync Board Component Location
Audionideo Sync Board Waveforms
Audionideo Sync Board Schematic
RGB Gain Control Board Component Location . 39 14. RGB Gain Control Board Waveforms
RGB Gain Control Board Schematic
Main Board Component Location
Main Board Waveforms
Main Board Schematic
High Voltage and Horizontal Sweep Board Component Location
High Voltage and Horizontal Sweep Board Waveforms
High Voltage and Horizontal Sweep Board Schematic
Width Step Board Component Location
Width Step Board Schematic
High Voltage Power Supply Component Location. 44 25. Video Output Board (High-Resolution) Component Lo- Cation
Video Output Board (High-Resolution) Waveforms
Video Output Board (High-Resolution) Schematic. 45 28. Video Output Board (Medium-Resolution) Component Location
Video Output Board (Medium-Resolution) Schematics
Primary Control Board A-12800 Component Location
Primary Control Board A-12800 Schematic
Primary Control Board Schematic ZVM-131-135. 47 33. Secondary Assembly A-9522 Component Location
Secondary Assembly A-9522 Schematic
Disassembly/Reassembly
Back Cover
Top Cover
Video Output Board
Input Panel
High Voltage and Horizontal Sweep Assembly
Crt
Primary Control Board
Audiolvideo Sync Board
Main Board
Speaker
Secondary Control Assembly
RGB Gain Control Board (ZVM-133 and ZVM-136)
Parts List
Monitor Major Assemblies
Cable Assemblies
Main Board
High Voltage and Horizontal Sweep Board
Width Step Board
Horizontal Output Transistor and Bracket Assembly
High Voltage Power Supply Board
High Resolution Video Output Board
Medium Resolution Video Output Board
RGB Gain Control Board
Audionideo Sync Board
Secondary Control Assembly
Monitor Exploded View
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Quick Links
1
Characteristics
2
Controls, Indicators, and Connectors
3
Zvm-135 Specifications
4
Rgb Signal
5
Rgb Input Signal
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SERVICE MANUAL
Color Video Monitors
Models ZVM-131/133/135/136
585-30'1
860-23-1
Table of
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Table of Contents
Troubleshooting
Other Precautions
19
Fault Isolation Procedures
20
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This manual is also suitable for:
Zvm-133
Zvm-135
Zvm-136
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