Wyse WY-99GT Manuals

Manuals and User Guides for Wyse WY-99GT. We have 2 Wyse WY-99GT manuals available for free PDF download: Maintenance Manual, User Manual

Wyse WY-99GT Maintenance Manual

Wyse WY-99GT Maintenance Manual (141 pages)

Brand: Wyse | Category: Touch terminals | Size: 7 MB

Table of Contents

Overview
6
How to Use this Manual
6
Table of Contents
8
General Information
14
Introduction
14
Monitor/Power Supply
15
High-Level Functional Description
16
Microcontroller
16
Memory
16
Graphics
17
Input/Output Devices
17
Keyboard
17
Cathode Ray Tube
17
Communications
17
Environmental Considerations
17
Memory Map
17
Operator Controls and External Interfaces
18
Keyboard
19
Power Cord
19
Operator Controls and External Interfaces
19
Communications Cable
20
Fuse
20
Power Switch
20
Brightness Control
20
Setup Parameters
20
Entering and Leaving Setup Mode
20
Top Setup Level
21
Changing the Operation Parameters
22
Removal/Replacement Procedures
24
Overview
24
Tools and Materials
25
Before You Start
25
Exploded View of Three Major Modules
26
Logic PCB
26
Removing and Replacing Assemblies in the Monitor Module
27
Discharging the Anode
27
Orientation View of Terminal and Components
27
Monitor/Power Supply PCB
29
Discharging the Anode before Installation
29
Crt/Yoke Assembly
31
Brightness Potentiometer
33
Removing and Replacing Assemblies in the Logic Pedestal Module
35
Fuse
35
Brightness Control Potentiometer
35
Pedestal Module
35
AC Power Switch
36
Fuse Removal
36
Logic PCB
37
AC Power Switch Removal
37
Line Filter PCB
39
Removing and Replacing Assemblies in the Keyboard Module
40
Replacing the Line Filter PCB
40
ASCII Keyboard Replacement
42
ASCII Keyboard Cable Replacement
42
ASCII Keyboard PCB Replacement
43
VT220- and Enhanced PC-Style Keyboard Replacement
43
VT220- and Enhanced PC-Style Keyboard Cable Replacement
44
VT220- and Enhanced PC-Style Keyboard PCB Replacement
44
VT220- and Enhanced PC-Style Keyboard Assembly
44
Introduction
46
Printed Circuit Board Layout and Component Identification
46
Functional Description of Major Components
47
8051 Microcontroller
48
Gate Array
48
Beeper Driver
48
Attribute Data Latches
48
Parallel-To-Serial Converters
48
Video Drivers and Dot Stretcher
48
Soft-Font Control
48
Presettable Scan Line Counter
48
Clock Generators
48
Blink Rate Generator
48
Clock Divider
49
2672 CRT Controller (4F)
49
Duart (11G)
49
Prom (3D)
49
Chip-Select Decoder (5C)
49
Clock Rates
49
Low Order Address Latch (40)
51
Keyboard Interface (15G)
51
Row Buffer RAM (80, 90)
51
Attribute Row Buffer Data Latch (1 OC)
51
Character and Attribute RAM (50, 4C)
51
Soft-Font RAM (10B)
51
Video Clock Generator (5A)
51
Nonvolatile Memory (2F)
51
Level Converters (EIA to TIL) (3H, 7H, 10H)
51
Low Order Address Latch
51
Level Converters (TTL to EIA) (8H, 9H, 12H, 13H)
52
Microprocessor, 8088 (140)
52
Graphics EPROM (11 D)
52
Graphics RAM (12C, 13C, 14C, 15C)
52
Interprocessor Communications Latches (12F, 13F)
52
Interprocessor Status Latches (12G)
52
Monitor/Power Supply
52
Line Filter
52
Voltage Doubler
53
Pulse Width Modulator
53
Main Switching Power Transformer
53
Horizontal Driver
53
Regulation Circuitry
53
Volt Supply
53
Flyback Transformer
53
Vertical Deflection Circuit
54
Video Amplifier
54
Crt
54
Horizontal Oscillator Timing
56
Keyboard
57
Vertical Timing
57
Keyswitch Matrix
58
Functional Description
58
Microcontroller
58
Keyboard Block Diagram
58
Communication Interface
60
MODEM and aux Ports
60
Display Memory
60
Nonvolatile Memory
61
Keyboard Interface
61
Video Controller
61
Video Clock Circuitry
61
Programmable Video Controller
61
Attribute Control
62
Font RAM
62
Raster Scan Terminology
62
Attribute Byte
62
Troubleshooting
64
Before You Start-Safety Summary
64
Tools Required
65
Primary Troubleshooting Procedures
65
Preparing the Terminal for Troubleshooting
65
Power-On Self-Test
65
Diagnostic Self-Test
66
Troubleshooting Quick Reference Guide
67
Error Messages for the Diagnostic Self-Test
67
Troubleshooting Flowchart
68
Problem Symptoms and Troubleshooting Procedures
71
Symptom 1: no Video
71
Symptom 2: DIM Video
72
Symptom 3: a Single Line of Video on the Screen
73
Symptom 4: Vertical Roll
74
Symptom 5: Video Brighter on the Left Side, Characters Compressed
74
Symptom 6: Raster; no Video
74
Symptom 7: Leuer on Screen before or after Diagnostic Self-Test
75
Diagnostic Self-Test Error Code Troubleshooting
75
Symptom 7: Letter on Screen before or after Diagnostic Self-Test
75
Symptom 8: Poor Display Quality
77
Symptom 9: Keyboard Not Operating
78
Symptom 10: Communication Problems
78
Symptom 11: Characters Scrambled or Degraded, Dots Missing
78
Symptom 12: Characters Don't Appear on the Screen
78
Symptom 13: Graphics Doesn't Work
78
Symptom 14: Atrributes Don't Work
78
Symptom 15: 80F132-Column Mode Doesn't Work
78
Additional Troubleshooting Procedures
78
Installation Checklist
78
Dots Missing
78
Checking for Continuity
79
Power Supply Check from the Logic PCB
79
Troubleshooting Flowchart
81
Power Connector at the Logic PCB
81
Attribute Test Pattern
82
Adjustments and Alignments
84
Introduction
84
Safety Summary
84
Tools for Alignment
85
Does the Terminal Meet the Display Specification
85
Aligning the Display
86
Power Supply Component Layout
87
Adjustments
88
Height
88
Width
88
Height
89
Width
89
Yoke Lock
89
Adjustment Locations
89
Centering Rings
90
Display Magnets
90
Yoke Lock on the CRT Neck
91
Brightness
93
Focus
93
Linearity
93
Test Patterns
93
Test Pattern M
94
Test Pattern
95
Illustrated Parts List
96
C Test Connectors
97
Monitor Module Assembly Exploded View
97
Keyboard Assemblies Exploded Views
98
Logic Assembly Parts List
99
Monitor/Power Supply Parts List
102
Filter Board Parts List
105
Keyboard Assemblies Parts List
105
Schematics
108
I
111
Terminal Dimensions
128
Discharging the Anode
134
Crt/Yoke Assembly
134
Centering Rings
134
Display Magnets
134

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Wyse WY-99GT User Manual

Wyse WY-99GT User Manual (100 pages)

Brand: Wyse | Category: Touch terminals | Size: 4 MB

Table of Contents

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