Zenith ZCM-1490 CRT Color Monitor Manuals

Manuals and User Guides for Zenith ZCM-1490 CRT Color Monitor. We have 2 Zenith ZCM-1490 CRT Color Monitor manuals available for free PDF download: Service Manual

Zenith ZCM-1490 Service Manual (104 pages)

Color Video Monitor

Brand: Zenith | Category: Monitor | Size: 13 MB

Table of Contents
5
Chapter 1 - Introduction

9
- Specifications
  9
Chapter 2 - Installation

13
- Controls and Connections
  13
- ZCM-1490 Front View
  13
- ZCM-1490 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
Chapter 3 - Disassembly

17
Chapter 4 - Adjustments

27
- Monitor Adjustment Devices
  27
- Video Board Adjustment Locations
  28
- Deflection Board Adjustment Locations
  29
- Dynamic Focus Board Adjustment Locations
  30
- Preparation
  31
- Deflection Board Adjustments
  31
  - Horizontal Hold
    31
- Control Board Adjustment Locations
  31
  - Horizontal DC Raster Centering
    32
  - Horizontal Phase
    32
  - Horizontal Size
    32
  - Vertical Hold
    32
  - Vertical DC Raster Centering
    32
  - Vertical Size
    32
  - Vertical Linearity
    33
- Focus
  33
- Dynamic Focus
  33
- Pincushion Adjustments
  34
  - North-South Pincushion
    34
  - East-West Pincushion
    35
- CRT Cutoff
  35
- CRT Gun Waveforms
  35
- Video Gain
  36
- Final Checks
  36
Chapter 5 - Circuit Descriptions

39
- Functional Overview
  39
- ZCM-1490 Block Diagram
  40
- Video Input Processing
  41
Video Amplifiers

41
- Video Drivers
  42
- Cascode Output Amplifier
  42
- DC Restoration
  42
- Class AB Output Stage
  43
- Cutoff
  43
- Retrace Line Prevention
  43
- Black Level
  43
- Sync Input Processing
  43
  - Mode Selection
    43
  - Vertical Processing and Controls
    44
  - Horizontal Controls
    44
- Mode Selection
  44
- Horizontal Deflection
  45
  - Horizontal Driver
    45
  - Horizontal Output
    45
- Horizontal Output Amplifier
  45
  - Horizontal Centering
    46
  - Control Grid Voltage
    46
- 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
  - East-West Waveform Generator
    48
- Blanking Pulse Circuit
  48
- E-W Waveform Generator
  48
  - East-West Regulator
    49
  - North-South Waveform Generator
    50
- N-S Waveform Generator
  50
  - North-South Output
    52
- Dynamic Focus
  52
- Degaussing Coil
  52
Chapter 6 - Troubleshooting

53
Chapter 7 - Parts List

90
Chapter 8 - Schematics and Waveforms

90

Zenith ZCM-1490 Service Manual (111 pages)

Color Video Monitor

Brand: Zenith | Category: Monitor | Size: 11 MB

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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Zenith ZCM-1490 CRT Color Monitor Manuals

Zenith ZCM-1490 Service Manual (104 pages)

Table of Contents

Chapter 1 - Introduction

Chapter 2 - Installation

Chapter 3 - Disassembly

Chapter 4 - Adjustments

Chapter 5 - Circuit Descriptions

Video Amplifiers

Chapter 6 - Troubleshooting

Chapter 7 - Parts List

Chapter 8 - Schematics and Waveforms

Zenith ZCM-1490 Service Manual (111 pages)

Table of Contents

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