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Manuals
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Wyse Manuals
Monitor
WY-120
Maintenance manual
Wyse WY-120 Maintenance Manual
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Also See for WY-120
:
Maintenance manual
(96 pages)
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Overview
Safety Summary
Introduction
Table of Contents
Removal and Replacement
Terminal Modules
Safety Requirements
Required Tools
Keyboard Module Removal and Replacement
Keyboard Styles
ASCII Keyboard Layout
ANSI Keyboard Layout7
ASCII/ANSI Keyboard Assembly
Enhanced PC Styles Keyboard Assembly
Terminal Enclosure Removal
Removing the Terminal Enclosure
Terminal Enclosure Replacement
Fuse Removal and Replacement
Fuse Location
Discharging the Anode
Terminal PCB Removal
Removing the Terminal PCB, Right Side
Removing the Terminal PCB, Left Side
Terminal PCB Replacement
CRT Removal
CRT Replacement
Yoke Assembly Removal
Yoke Assembly Replacement
Troubleshooting
Before You Start
Safety
Primary Troubleshooting Procedures
Diagnostic Self-Test
Error Codes
Troubleshooting Quick Reference Guide
Loopback Test Connector Pin Assignments
Reset Circuitry IC U1 Flowchart
Beeper Circuitry Flowchart
Dot Clock IC U8 Flowchart
Custom IC U4 Flowchart
Transformer Flowchart
Power Supply Flowchart
Horizontal Controller IC 201 Flowchart
Vertical Controller
CRT Driver Flowchart
CRT Flowchart
Adjustments and Alignments
Setting up the Test Patterns
Test Pattern Sequence
Checking the Display Specification
The "M" 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
Linearity
Horizonal Size
Display Tilt
Centering Rings
Display Magnets
Brightness/Subcontrast Adjustment
Focus
Theory of Operations
Logic Circuitry Block Diagram
Pin Assignments for the 8032 Microcontroller
System PROM
Display RAM
Character Fonts
System Clock
System Clock Diagram
Keyboard Buffer
Keyboard Buffer Diagram
Battery Backup
Parallel Port
Line Filter
Pulse-Width Modulator
Main Switching Power Transformer
Horizontal Driver
Regulation Circuitry
Output Filtering
Flyback Transformer
Vertical Deflection Circuit
Video Amplifier
Crt
Keyboard
Keyboard Block Diagram
Parts List
Product Safety Notice
Terminal Assemblies
Terminal PCB and CRT Driver PCB
Component Level Parts List
Display Inspection with the Reticle
Video Inspection Reticle
Definitions
Checking the Display with the Reticle
Checking Width
Checking Width and Height
Checking Straightness and Pincushioning
Checking Centering
Verifying Linearity
Specifications
Index
Schematics
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Table of Contents
Troubleshooting
Troubleshooting
23
Primary troubleshooting procedures
24
Troubleshooting quick reference guide
25
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