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WY-99GT
Maintenance manual
Wyse WY-99GT Maintenance Manual
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User manual
(100 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Overview
How to Use this Manual
Table of Contents
General Information
Introduction
Monitor/Power Supply
High-Level Functional Description
Microcontroller
Memory
Graphics
Input/Output Devices
Keyboard
Cathode Ray Tube
Communications
Environmental Considerations
Memory Map
Operator Controls and External Interfaces
Keyboard
Power Cord
Operator Controls and External Interfaces
Communications Cable
Fuse
Power Switch
Brightness Control
Setup Parameters
Entering and Leaving Setup Mode
Top Setup Level
Changing the Operation Parameters
Removal/Replacement Procedures
Overview
Tools and Materials
Before You Start
Exploded View of Three Major Modules
Logic PCB
Removing and Replacing Assemblies in the Monitor Module
Discharging the Anode
Orientation View of Terminal and Components
Monitor/Power Supply PCB
Discharging the Anode before Installation
Crt/Yoke Assembly
Brightness Potentiometer
Removing and Replacing Assemblies in the Logic Pedestal Module
Fuse
Brightness Control Potentiometer
Pedestal Module
AC Power Switch
Fuse Removal
Logic PCB
AC Power Switch Removal
Line Filter PCB
Removing and Replacing Assemblies in the Keyboard Module
Replacing the Line Filter PCB
ASCII Keyboard Replacement
ASCII Keyboard Cable Replacement
ASCII Keyboard PCB Replacement
VT220- and Enhanced PC-Style Keyboard Replacement
VT220- and Enhanced PC-Style Keyboard Cable Replacement
VT220- and Enhanced PC-Style Keyboard PCB Replacement
VT220- and Enhanced PC-Style Keyboard Assembly
Introduction
Printed Circuit Board Layout and Component Identification
Functional Description of Major Components
8051 Microcontroller
Gate Array
Beeper Driver
Attribute Data Latches
Parallel-To-Serial Converters
Video Drivers and Dot Stretcher
Soft-Font Control
Presettable Scan Line Counter
Clock Generators
Blink Rate Generator
Clock Divider
2672 CRT Controller (4F)
Duart (11G)
Prom (3D)
Chip-Select Decoder (5C)
Clock Rates
Low Order Address Latch (40)
Keyboard Interface (15G)
Row Buffer RAM (80, 90)
Attribute Row Buffer Data Latch (1 OC)
Character and Attribute RAM (50, 4C)
Soft-Font RAM (10B)
Video Clock Generator (5A)
Nonvolatile Memory (2F)
Level Converters (EIA to TIL) (3H, 7H, 10H)
Low Order Address Latch
Level Converters (TTL to EIA) (8H, 9H, 12H, 13H)
Microprocessor, 8088 (140)
Graphics EPROM (11 D)
Graphics RAM (12C, 13C, 14C, 15C)
Interprocessor Communications Latches (12F, 13F)
Interprocessor Status Latches (12G)
Monitor/Power Supply
Line Filter
Voltage Doubler
Pulse Width Modulator
Main Switching Power Transformer
Horizontal Driver
Regulation Circuitry
Volt Supply
Flyback Transformer
Vertical Deflection Circuit
Video Amplifier
Crt
Horizontal Oscillator Timing
Keyboard
Vertical Timing
Keyswitch Matrix
Functional Description
Microcontroller
Keyboard Block Diagram
Communication Interface
MODEM and aux Ports
Display Memory
Nonvolatile Memory
Keyboard Interface
Video Controller
Video Clock Circuitry
Programmable Video Controller
Attribute Control
Font RAM
Raster Scan Terminology
Attribute Byte
Troubleshooting
Before You Start-Safety Summary
Tools Required
Primary Troubleshooting Procedures
Preparing the Terminal for Troubleshooting
Power-On Self-Test
Diagnostic Self-Test
Troubleshooting Quick Reference Guide
Error Messages for the Diagnostic Self-Test
Troubleshooting Flowchart
Problem Symptoms and Troubleshooting Procedures
Symptom 1: no Video
Symptom 2: DIM Video
Symptom 3: a Single Line of Video on the Screen
Symptom 4: Vertical Roll
Symptom 5: Video Brighter on the Left Side, Characters Compressed
Symptom 6: Raster; no Video
Symptom 7: Leuer on Screen before or after Diagnostic Self-Test
Diagnostic Self-Test Error Code Troubleshooting
Symptom 7: Letter on Screen before or after Diagnostic Self-Test
Symptom 8: Poor Display Quality
Symptom 9: Keyboard Not Operating
Symptom 10: Communication Problems
Symptom 11: Characters Scrambled or Degraded, Dots Missing
Symptom 12: Characters Don't Appear on the Screen
Symptom 13: Graphics Doesn't Work
Symptom 14: Atrributes Don't Work
Symptom 15: 80F132-Column Mode Doesn't Work
Additional Troubleshooting Procedures
Installation Checklist
Dots Missing
Checking for Continuity
Power Supply Check from the Logic PCB
Troubleshooting Flowchart
Power Connector at the Logic PCB
Attribute Test Pattern
Adjustments and Alignments
Introduction
Safety Summary
Tools for Alignment
Does the Terminal Meet the Display Specification
Aligning the Display
Power Supply Component Layout
Adjustments
Height
Width
Height
Width
Yoke Lock
Adjustment Locations
Centering Rings
Display Magnets
Yoke Lock on the CRT Neck
Brightness
Focus
Linearity
Test Patterns
Test Pattern M
Test Pattern
Illustrated Parts List
C Test Connectors
Monitor Module Assembly Exploded View
Keyboard Assemblies Exploded Views
Logic Assembly Parts List
Monitor/Power Supply Parts List
Filter Board Parts List
Keyboard Assemblies Parts List
Schematics
I
Terminal Dimensions
Discharging the Anode
Crt/Yoke Assembly
Centering Rings
Display Magnets
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WY-99GT
Maintenance
Manual
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Table of Contents
Troubleshooting
Troubleshooting
64
Tools Required
65
Troubleshooting Quick Reference Guide
67
Troubleshooting Flowchart
68
Problem Symptoms and Troubleshooting Procedures
71
Symptom 7: LeUer on Screen Before or After Diagnostic Self-Test
75
Symptom 9: Keyboard Not Operating
78
Troubleshooting Flowchart
81
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