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ZCM-1490
Service manual
Zenith ZCM-1490 Service Manual
Color video monitor
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Service manual
(111 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Chapter 1 - Introduction
Specifications
Chapter 2 - Installation
Controls and Connections
ZCM-1490 Front View
ZCM-1490 Rear View
Subminiature D-Type Connector
Video Input Cable Pin Functions
Set-Up and Operation
Initial Tests
Color Bar Test
Fill Screen Test
Chapter 3 - Disassembly
CRT Anode Discharging
Rear Cover Removal
Rear Chassis Panel Removal
Video Board Removal
Control Board Removal
PIN Board Removal
Fan and Bottom Panel Removal
Support Bracket and Shield Removal
Deflection Board Assembly Removal
Deflection Board Removal
Power Supply/Dynamic Focus Board Assembly Removal
Power Supply/Focus Board Assembly Removal
Power Supply and Dynamic Focus Board Removal
CRT Lead Dress and Removal
Chapter 4 - Adjustments
Monitor Adjustment Devices
Video Board Adjustment Locations
Deflection Board Adjustment Locations
Dynamic Focus Board Adjustment Locations
Preparation
Deflection Board Adjustments
Horizontal Hold
Control Board Adjustment Locations
Horizontal DC Raster Centering
Horizontal Phase
Horizontal Size
Vertical Hold
Vertical DC Raster Centering
Vertical Size
Vertical Linearity
Focus
Dynamic Focus
Pincushion Adjustments
North-South Pincushion
East-West Pincushion
CRT Cutoff
CRT Gun Waveforms
Video Gain
Final Checks
Chapter 5 - Circuit Descriptions
Functional Overview
ZCM-1490 Block Diagram
Video Input Processing
Video Amplifiers
Video Drivers
Cascode Output Amplifier
DC Restoration
Class AB Output Stage
Cutoff
Retrace Line Prevention
Black Level
Sync Input Processing
Mode Selection
Vertical Processing and Controls
Horizontal Controls
Mode Selection
Horizontal Deflection
Horizontal Driver
Horizontal Output
Horizontal Output Amplifier
Horizontal Centering
Control Grid Voltage
Anode Voltage
Anode Voltage Regulator
High Voltage Shutdown
Automatic Brightness Limiter
Vertical Deflection
Vertical Centering
Blanking Pulses
Pincushion Correction
East-West Waveform Generator
Blanking Pulse Circuit
E-W Waveform Generator
East-West Regulator
North-South Waveform Generator
N-S Waveform Generator
North-South Output
Dynamic Focus
Degaussing Coil
Chapter 6 - Troubleshooting
Safety Guidelines
AC Leakage Test
CRT Anode Discharging
Suggested Tools and Equipment
Inspection and Preparation
AC Leakage Voltmeter Circuit
Color Bar Test
Fill Screen Test
Disk-Based Diagnostics
Cleaning Procedure
Surface Mount Component Replacement
Troubleshooting Charts
Pin Board Troubleshooting Chart
Power Supply Troubleshooting Chart
General Troubleshooting Chart
Video Board Troubleshooting Chart
Deflection Board Troubleshooting Chart
Resistance Measurements
PIN Board Transistor Resistance
Measurements
Video Board Transistor Resistance Measurements
Video Board IC Resistance Measurements
Deflection Board Transistor Resistance Measurements
Deflection Board IC Resistance Measurements
Dynamic Focus Board Transistor Resistance Measurements
PIN Board Transistor Voltage Measurements
PIN Board IC Voltage Measurements
Video Board Transistor Voltage Measurements
Designated Components Parts List
Miscellaneous Parts List
Heath Parts List
Waveform Explanation
Oscilloscope Display Information
Chapter 7 - Parts List
Chapter 8 - Schematics and Waveforms
Video Board Component View
Video Board Component View (Foil Side)
Video Board Schematic
Deflection Board Component View
Deflection Board Component View (Foil Side)
Horizontal Deflection/High Voltage Schematic
Vertical Deflection/Mode Selection Schematic
PIN Board Component View (Component Side)
PIN Board Component View (Foil Side)
E-W Generator/Regulator Schematic
N-S Generator/Output Schematic
Dynamic Focus Board Component View
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Specifications
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Controls and Connections
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See also:
Service Manual
SERVICE MANUAL
Color Video Monitor
ZCM-1490
;TI'NI'H
I
data
.
systems
585-230
860-183
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Table of Contents
Troubleshooting
Chapter 6 - Troubleshooting
53
Surface Mount Component Replacement
57
General Troubleshooting Chart
58
Video Board Troubleshooting Chart
59
Deflection Board Troubleshooting Chart
60
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