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Touch terminals
WY-85
Maintenance manual
Wyse WY-85 Maintenance Manual
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User manual
(94 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Overview
Table of Contents
1 General Information
Introduction
Simplified Block Diagram
High-Level Functional Description
Microprocessor
Memory
Input/Output Devices
Memory Map
Telecommunications
Environmental Considerations
Operator Controls
Setup Parameters
Setup Levels
Removal/Replacement Procedures
Discharging the Anode
Keyboard PCB
Monitor/Power Supply PCB
Keyboard Assembly
Overview
Three Major Modules Exploded View
Removing and Replacing Assemblies in the Monitor Module
Monitor/Power Supply PCB
Removing and Replacing Assemblies in the Keyboard Module
Operator Brightness Potentiometer
Removing and Replacing Assemblies in the Logic Pedestal Module
Fuse Location
3 Troubleshooting
Troubleshooting Quick Reference Guide
Before You Start
The Terminal
Troubleshooting Quick Reference Guide
Troubleshooting Flowchart
Troubleshooting Flowchart, Page 2 of 4
Installation Checklist
Terminal Installation Checklist
Checking for Continuity
Power Supply Check from the Logic PCB
Checking Horizontal Synchronization
Pcb
Power-On Self-Test
Power-On Self-Test Error Messages
Diagnostic Self-Test
DI Agnostic Sel F - Test
Diagnostic Self-Test Error Messages
4 Adjustments and Alignments
Safety Summary
Tools Required
Power Adjustments
Power Supply Component Layout
Does the Terminal Meet the Display Specification
Aligning the Terminal Display
Adjustments
Display Magnets
Pattern
Test Pattern Problems and Adjustments
Yoke Lock on the CRT Neck
Test Patterns
Pat Tern
5 Illustrated Parts List
Terminal Display Assembly Exploded View
Keyboard Assembly Exploded View
6 Theory of Operations
Printed Circuit Board Layout and
Logic PCB
Monitor/Power Supply Block Diagram
Horizontal Oscillator Timing
Keyboard Block Diagram
Vertical Timing
Functional Description
Keyboard Block Diagram
Attribute Byte
7 Schematics
Logic PCB
Keyboard PCB Schematic
Terminal Dimensions
Connector Pin Assignments
COMM Port Pin Assignments (DTE
PR Port Pin Assignments (DTE
20Ma Port Pin Assignments
Test Connectors
Display Inspection with the Reticle
Video Inspection Reticle
Checking Width and Height
Checking Straightness, Pincushioning, Centering, and Linearity
Checking Intensity and Focus
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WY-85
Maintenance
Manual
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Table of Contents
Troubleshooting
TROUBLESHOOTING
38
Troubleshooting Quick Reference Guide
40
Troubleshooting Flowchart
41
Troubleshooting Flowchart, page 2 of 4
42
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