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Zenith Manuals
Monitor
ZCM-1490
Service manual
Table Of Contents - Zenith ZCM-1490 Service Manual
Color video monitor
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Service manual
(104 pages)
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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Table of Contents
Warnings And Cautions
3
Contents
5
Introduction
9
Specifications
9
Installation
13
Controls And Connections
13
Front View
13
Rear View
13
Subminiature D-Type Connector
14
Video Input Cable Pin Functions
14
Set-Up And Operation
15
Initial Tests
15
Color Bar Test
15
Fill Screen Test
15
Disassembly
17
Crt Anode Discharging
17
Rear Cover Removal
18
Rear Chassis Panel Removal
18
Video Board Removal
19
Control Board Removal
20
Pin Board Removal
20
Fan And Bottom Panel Removal
21
Support Bracket And Shield Removal
21
Deflection Board Assembly Removal
22
Power Supply/Dynamic Focus Board Assembly Removal
24
Crt Lead Dress And Removal
26
Adjustments
27
Video Board Adjustment Locations
28
Pin Board Adjustment Locations
30
Dynamic Focus Board Adjustment Locations
30
Preparation
31
Deflection Board Adjustments
31
Horizontal Hold
31
Horizontal Dc Raster Centering
32
Horizontal Phase
32
Horizontal Size
32
Vertical Hold
32
Dynamic Focus
33
Focus
33
Vertical Linearity
33
Pincushion Adjustments
34
North-South Pincushion
34
Crt Cutoff
35
East-West Pincushion
35
Crt Gun Waveforms
35
Video Gain
36
Final Checks
36
Circuit Descriptions
39
Functional Overview
39
Block Diagram
40
Video Input Processing
41
Video Amplifiers
41
Video Drivers
42
Cascode Output Amplifier
42
Dc Restoration
42
Sync Input Processing
43
Class Ab Output Stage
43
Cutoff
43
Black Level
43
Vertical Processing And Controls
44
Horizontal Controls
44
Mode Selection
44
Horizontal Deflection
45
Horizontal Driver
45
Horizontal Output
45
Anode Voltage
46
Anode Voltage Regulator
46
High Voltage Shutdown
46
Automatic Brightness Limiter
46
Vertical Deflection
47
Vertical Centering
47
Blanking Pulses
48
Pincushion Correction
48
E-W Waveform Generator
48
East-West Regulator
49
North-South Waveform Generator
50
Degaussing Coil
52
N-S Output
52
Troubleshooting
53
Safety Guidelines
53
Ac Leakage Test
54
Suggested Tools And Equipment
55
Inspection And Preparation
55
Ac Leakage Voltmeter Circuit
55
Cleaning Procedure
56
Disk-Based Diagnostics
56
Surface Mount Component Replacement
57
Troubleshooting Charts
57
General Troubleshooting Chart
58
Resistance Measurements
63
Parts List
67
Schematics And Waveforms
89
Waveform Explanation
89
Oscilloscope Display Information
89
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Table of Contents
Troubleshooting
Troubleshooting
53
Surface mount component replacement
57
General troubleshooting chart
58
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