IBM 5251 Series Maintenance Information Manual page 7

143 Keyboard Arrangement . . .
Keyboard Template (GX21-9266)
Standard Keyboard Layout
Standard Keyboard Layout (Katakana)
Data-Entry Keyboard Layout (66 Keys)
Data-Entry Keyboard Layout (67 Keys)
Katakana Data-Entry Keyboard Layout (69)
144 Scan Code Table . . . . .
150 Display Assembly Locations . . . . .
Top View . . . . . . . . . . . . . . .
151 Display Assembly Removal and Replacement
Removal . . . . . .
Replacement. . . . .
DISPLAY ADJUSTMENTS
152 Video Adjustments
Brightness Limiter Potentiometer Adjustment
Contrast Control and Brightness
Control Adjustments . . . . . . . .
Video Gain/Video Drive Potentiometer
Adjustment . . . . . . . . . . . .
153 Vertical and Horizontal Adjustments
Vertical Adjustments . .
Horizontal Adjustments . . .
154 Yoke Adjustment (150) . .
155 Centering Adjustment (150)
Factory Adjustments. . . . . .
Focus Potentiometer Adjustment
B+ Potentiometer Adjustment
156 Raster . . . . . . .
Raster Check . . . . . . . .
157 Display Assembly Cable Mini-MAP
Conditions After Power On
Service Aids . . . . . . .
Tools . . . . . . . . . .
158 Display Screen Examples
SYSTEM CABLE . . . . . .
170 Customer System Cable Signal Quality Check
171 Internal System Cable and Terminator Switch
172 Typical Display Station Configuration
173 Station Protector and Lightning Protector .
Station Protector . . . . . . .
Typical Installation . . . . . .
Typical Station Protector Board
Lightning Protector . . . . . .
174 Cable Assembly Procedures.
Assembly of Twinaxial Cable
Assembly of Coaxial Cable
Twinaxial-Coaxial Adapter
Adapter Service Check
Cable Labeling . . . . . .
Tests of Cabling After Installation
POWER SUPPLY . . . . . . . . .
180 Power Supply Locations . . .
181 Power Supply Removal and Replacement
Removal . . . . . . .
Replacement. . . . . . . . . . .
182 Voltage Level Checks . . . . .
183 Power Supply Ripple Level Check
184 Power Supply Charts
US Power Supply . . . . . . . .
World Trade Power Supply
185 Line Cordi Line Filter Removal and Replacement
187 Power Supply Fan Removal and Relplacement
Removal
Replacement. . . . . . . . . . . . . . . . .
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188 Light Pen Power Supply Card
Removal and Replacement 1-103
Removal 1-103
Replacement . 1-103
DIAGNOSTIC AIDS 1-104
200 Control Panel LEDs 1-104
Line Sync
1-104
Line Check 1-104
Internal Check 1-104
Storage Check 1-104
Ready 1-104
201 Status Switch 1-105
202 Field Attribute Characters .
1-107
203 Display Station Operation Overview 1-108
204 Power-On Diagnostic 1-109
Power-On Diagnostic Flowchart (Part 1 of 3)
1-109
Power-On Diagnostic Flowchart (Part 2 of 3) 1-110
Power-On Diagnostic Flowchart (Part 3 of 3) 1-111
205 Free Key Operation 1-112
Free Key Mode Flowchart
1-112
206 Online Tests 1-113
Online Tests Overview 1-114
Online Tests Displays .
1-115
207 Sign-On Procedure 1-128
208 Error History Table 1-129
209 Error Codes .
1-130
Display Station Error Codes 1-130
Operator Error Codes 1-132
210 Diagnostic Display Locations 1-135
Cursor Display Positions 1-135
Power-On Diagnostic Display 1-135
212 Troubleshooting Aids 1-136
PREVENTIVE MAINTENANCE. 2-1
TOOLS AND TEST EQUIPMENT
3-1
CE General Logic Probe(Part 453212) 3-2
THEORY.
4-1
INTRODUCTION 4-1
System Configuration 4-1
DATA FLOW 4-3
FUNCTIONAL UNITS 4-4
I/O Adapter Control 4-4
Keyboard 4-5
Clicker 4-5
Keyboard Identification 4-5
Display Adapter .
4-6
Buffering and. Displaying 4-7
Control Panel . 4-8
Display Screen 4-9
Field Attributes 4-9
Display Screen Indicators 4-9
Cable Adapter 4-9
The 16-Bit Frame 4-9
Transmission Sequences 4-11
Commands 4-12
Response Frame
4-14
Interface 4-16
Data Transfer 4-17
Microprocessing Unit (MPU) 4-18
Read/Write Storage 4-18
Internal Processing Queue 4-18
Control Registers . 4-19
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