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ZCM-1490
Zenith ZCM-1490 Manuals
Manuals and User Guides for Zenith ZCM-1490. We have
2
Zenith ZCM-1490 manuals available for free PDF download: Service Manual
Zenith ZCM-1490 Service Manual (104 pages)
Color Video Monitor
Brand:
Zenith
| Category:
Monitor
| Size: 13.16 MB
Table of Contents
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
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
Deflection Board Removal
23
Power Supply/Dynamic Focus Board Assembly Removal
24
Power Supply/Focus Board Assembly Removal
24
Power Supply and Dynamic Focus Board Removal
25
CRT Lead Dress and Removal
26
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
Safety Guidelines
53
AC Leakage Test
54
CRT Anode Discharging
54
Suggested Tools and Equipment
55
Inspection and Preparation
55
AC Leakage Voltmeter Circuit
55
Color Bar Test
56
Fill Screen Test
56
Disk-Based Diagnostics
56
Cleaning Procedure
56
Surface Mount Component Replacement
57
Troubleshooting Charts
57
Pin Board Troubleshooting Chart
57
Power Supply Troubleshooting Chart
57
General Troubleshooting Chart
58
Video Board Troubleshooting Chart
59
Deflection Board Troubleshooting Chart
60
Resistance Measurements
63
PIN Board Transistor Resistance
63
Measurements
63
Video Board Transistor Resistance Measurements
63
Video Board IC Resistance Measurements
64
Deflection Board Transistor Resistance Measurements
64
Deflection Board IC Resistance Measurements
64
Dynamic Focus Board Transistor Resistance Measurements
65
PIN Board Transistor Voltage Measurements
65
PIN Board IC Voltage Measurements
65
Video Board Transistor Voltage Measurements
65
Designated Components Parts List
68
Miscellaneous Parts List
84
Heath Parts List
86
Waveform Explanation
88
Oscilloscope Display Information
88
Chapter 7 - Parts List
90
Chapter 8 - Schematics and Waveforms
90
Video Board Component View
92
Video Board Component View (Foil Side)
93
Video Board Schematic
94
Deflection Board Component View
95
Deflection Board Component View (Foil Side)
96
Horizontal Deflection/High Voltage Schematic
97
Vertical Deflection/Mode Selection Schematic
98
PIN Board Component View (Component Side)
99
PIN Board Component View (Foil Side)
100
E-W Generator/Regulator Schematic
101
N-S Generator/Output Schematic
102
Dynamic Focus Board Component View
103
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Zenith ZCM-1490 Service Manual (111 pages)
Color Video Monitor
Brand:
Zenith
| Category:
Monitor
| Size: 11.78 MB
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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