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Touch terminals
WY-120
Maintenance manual
Wyse WY-120 Maintenance Manual
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Maintenance manual
(99 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Removal and Replacement Procedures
Overview
Terminal Modules
Safety Requirements
Required Tools
Keyboard Module Removal and Replacement
Keyboard Styles
ASCII/ ANSI Keyboard Cable and PCB Removal and Replacement
ASCII/ ANSI Keyboard Assembly
Enhanced PC-Style Keyboard Cable and PCB Removal and Replacement
Enhanced PC-Style Keyboard Assembly
Terminal Module Assemblies Removal and Replacement
Terminal Enclosure Removal
Terminal Enclosure Replacement
Fuse Removal and Replacement
Removing the Terminal Enclosure
Discharging the Anode
Fuse Location
Terminal PCB Removal
Discharging the Anode
Terminal PCB Replacement
CRT Removal
CRT Replacement
Yoke Assembly Removal
Yoke Assembly Replacement
Before You Start
Safety
Required Tools
2 Troubleshooting
Error Codes
Troubleshooting Quick Reference Guide
Primary Troubleshooting Procedures
Diagnostic Self-Test
Loopback Test Connector Pin Assignments
Module-Level Troubleshooting Quick Reference Guide
Reset Circuitry IC U1 Flowchart
Troubleshooting by Symptom
Troubleshooting Flowcharts
Beeper Circuitry Flowchart
Power Supply Line Filter Flowchart
Transformer Flowchart
Power Supply Flowchart
Horizontal Controller IC 201 Flowchart
Vertical Controller IC 301 TOA 1170 Flowchart
CRT Flowchart
Adjustments and Alignments
Overview
Safety Summary
Required Tools
Loopback Test Connector Pin Assignments
Setting up the Test Patterns
Checking the Display Specification
Test Pattern Sequence
The Pincushion Pattern Test Screen
Adjusting the Voltage
Component Locations on the Terminal PCB
Adjusting the Terminal Display
Display Adjustment Quick Reference Guide
Vertical Size
Horizontal Hold
Linearitv
Horizontal Size
Display Rotation
Centering Rings
Display Tilt
Display Magnets
Brightness/Subcontrast Adjustment
Focus
Theory of Operations
Yoke Lock, Centering Rings. and Display Magnets
Introduction
Logic Circuitry Block Diagram
8032 Microcontroller (U6)
Pin Assignments for the 8032 Microcontroller
System PROM (US)
Custom IC (U4)
Terminal PCB Logic Components Functional Description
Pin Assignments for Custom IC U4
Display RAM (U3, U9)
Character Fonts (U2)
System Clock (US)
Keyboard Buffer (U13)
Battery Backup
Keyboard Buffer (U13) Diagram
Parallel Port (AUX1)
System Clock Diagram
Parallel Port (AUX1) Diagram
Serial Port (MAIN)
Monitor/Power Supply Components Functional Description
Serial Port (MAIN) Diagram
Line Filter
Pulse-Width Modulator
Main Switching Power Transformer
Horizontal Driver
Regulation Circuitry
Output Filtering
Regulation Circuit
4-15 Flyback Transformer
Vertical Deflection Circuit
Video Amplifier
Crt
Keyboard
Parts Lists
Product Safety Notice
Terminal Assemblies
Terminal Assemblies
Terminal PCB and CRT Driver PCB
6 Schematics
Product Safety Notice
Logic/Power Supply PCB Schematic
Appendixes
A-Display Inspection with the Reticle
Checking Straightness, Pincushioning, Centering, and Vertical Linearity
B-Specifications
Index
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WY-120 Maintenance Manual
Document 880491-01 Rev. A
April 1988
Wyse Technology
3 5 71 N. First Street
San Jose, CA 95134
Printed in U.S.A.
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Table of Contents
Troubleshooting
Troubleshooting
23
Primary Troubleshooting Procedures
24
Troubleshooting Quick Reference Guide
25
Reset Circuitry IC U1 Flowchart
26
Troubleshooting Flowcharts
27
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