Table Of Contents - Zenith ZVM-133-TC Service Manual

Chapter 1 Characteristics
Description ................................... 1-1
Controls, Indicators, and Connectors . . . . . . . . . . . . .. 1-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-3
Chapter 2 Installation
Chapter 3 Circuit Descriptions
Monitor ................ . . . . . . . . . . . . . . . . . . . . . . 3-1
RGB Gain Control Board ..................... 3-1
RGB Signal Input ......................... 3-1
RGBI Input .............................. 3-1
Main Board ................................ 3-1
Start-up and Operating Voltages ............ 3-1
Degaussing Circuit ........................ 3-2
Power Supplies .......................... 3-2
+
150 VDC Supply ....................... 3-2
+
26 VDC Supply ........................ 3-2
+
12 VDC Supply ........................ 3-2
RGB Drive and Cutoff Voltages . . . . . . . . . . . . . 3-3
Vertical Sync ............................ 3-3
Horizontal Sync .......................... 3-3
Horizontal and Vertical Drive Outputs ........ 3-3
High Voltage and Horizontal Sweep Board ...... 3-4
Width Step Board ........................... 3-4
Video Output Board ......................... 3-4
Touch Control ................................ 3-4
Logic Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Bipolar
±
12 VDC Power Supply ............ 3-4
+
5 VDC Power Supply ................... 3-4
Reset ................................... 3-5
Timing .................................. 3-5
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Main CPU Interface ....................... 3-5
Strobe Synchronization .................... 3-6
Infrared LED Strobe Sequence ............. 3-6
Infrared Detection ......................... 3-7
Digital Infrared Detection Automatic Gain Control. 3-7
LED Drive ............................... 3-7
Chapter 4 Servicing
Safety and Service Guidelines ................... 4-1
AC Leakage Test ............................. 4-1
Other Precautions ............................. 4-2
Suggested Tools and Supplies .................. 4-2
Test Equipment ............................... 4-2
Contents
Troubleshooting ............................... 4-3
Monitor Fault Isolation Procedures ............... 4-4
Monitor Alignments and Adjustments. . . . . . . . . . . . . . 4-5
Main Board Adjustments ..................... 4-7
RGB Cutoff and G2 Adjustments ............ 4-7
RGB Drive Adjustments ................... 4-7
Vertical Height and Vertical Center Adjustments. 4-7
Horizontal Width and Horizontal Center Adjustments
........................................ 4-7
Horizontal Oscillator Adjustment ............. 4-8
+
95 Volt Adjustment ...................... 4-8
Sweep Assembly Adjustments ................. 4-8
Focus Adjustment ........................ 4-8
Width Selection .......................... 4-8
Monitor Performance Tests ...................... 4-9
Fill The Screen Test ........................ 4-9
Color Bar Test ............................. 4-9
Basic Program ............................ 4-10
Touch Control Sensitivity Adjustment ............ 4-10
Touch Control Fault Isolation Procedure .......... 4-11
Touch Control Alignment and Checkout .......... 4-14
Logic Board Dip Switch S101 ................ 4-14
Touch Control Performance Test ................ 4-15
Cleaning Procedure ........................... 4-16
Servicing Diagrams ........................... 4-16
Chapter 5 Disassembly/Reassembly
Back Cover (10) .............................. 5-1
Top Cover (20) ............................... 5-1
Video Output Board (70) ....................... 5-1
Cabinet Front (150) ............................ 5-1
Primary Control Board (125) .................... 5-1
RGB Gain Control Board (135) .................. 5-2
Main Board (85) .............................. 5-2
High Voltage and Horizontal Sweep Assembly (77) . 5-2
CRT Disassembly (105) ........................ 5-2
CRT Reassembly (105) ........................ 5-3
Logic Board (65) .............................. 5-4
LED Boards and Collector Plates ................ 5-5
Chapter 6 Parts List
Figures
1-1: Monitor Front View ....................... 1-1
1-2: Monitor Rear View . . . . . . . . . . . . . . . . . . . . . . .. 1-2