Table Of Contents - Zenith ZCM-1490 Service Manual

Table of Contents

Warnings And Cautions3
Contents5
Introduction9
Specifications9
Installation13
Controls And Connections13
Front View13
Rear View13
Subminiature D-Type Connector14
Video Input Cable Pin Functions14
Set-Up And Operation15
Initial Tests15
Color Bar Test15
Fill Screen Test15
Disassembly17
Crt Anode Discharging17
Rear Cover Removal18
Rear Chassis Panel Removal18
Video Board Removal19
Control Board Removal20
Pin Board Removal20
Fan And Bottom Panel Removal21
Support Bracket And Shield Removal21
Deflection Board Assembly Removal22
Power Supply/Dynamic Focus Board Assembly Removal24
Crt Lead Dress And Removal26
Adjustments27
Video Board Adjustment Locations28
Pin Board Adjustment Locations30
Dynamic Focus Board Adjustment Locations30
Preparation31
Deflection Board Adjustments31
Horizontal Hold31
Horizontal Dc Raster Centering32
Horizontal Phase32
Horizontal Size32
Vertical Hold32
Dynamic Focus33
Focus33
Vertical Linearity33
Pincushion Adjustments34
North-South Pincushion34
Crt Cutoff35
East-West Pincushion35
Crt Gun Waveforms35
Video Gain36
Final Checks36
Circuit Descriptions39
Functional Overview39
Block Diagram40
Video Input Processing41
Video Amplifiers41
Video Drivers42
Cascode Output Amplifier42
Dc Restoration42
Sync Input Processing43
Class Ab Output Stage43
Cutoff43
Black Level43
Vertical Processing And Controls44
Horizontal Controls44
Mode Selection44
Horizontal Deflection45
Horizontal Driver45
Horizontal Output45
Anode Voltage46
Anode Voltage Regulator46
High Voltage Shutdown46
Automatic Brightness Limiter46
Vertical Deflection47
Vertical Centering47
Blanking Pulses48
Pincushion Correction48
E-W Waveform Generator48
East-West Regulator49
North-South Waveform Generator50
Degaussing Coil52
N-S Output52
Troubleshooting53
Safety Guidelines53
Ac Leakage Test54
Suggested Tools And Equipment55
Inspection And Preparation55
Ac Leakage Voltmeter Circuit55
Cleaning Procedure56
Disk-Based Diagnostics56
Surface Mount Component Replacement57
Troubleshooting Charts57
General Troubleshooting Chart58
Resistance Measurements63
Parts List67
Schematics And Waveforms89
Waveform Explanation89
Oscilloscope Display Information89