Table Of Contents - IBM 3277 Troubleshooting Manual

Contents
Section 1.
Maintenance Approach 1-1
5.2.1.7
Model 2 Analog Card Adjustments 5-8
1.1
Introduction
1-1
5.2.2 -12V Regulator Card
5-8
1.1.1 Online/Offline Maintenance
1-1 5.2.3 OFF-PUSH Switch (Model 2 Only) 5-8
1.1.2
Field Replaceable Units (FRU) 1-1 5.3 Removals 5-9
1.1.3
Troubleshooting Aids 1-1 5.3.1 Covers 5-9
1.2 Trouble Analysis 1-1 5.3.2
Power Components 5-10
1.2.1 Obvious Symptoms 1-1
5.3.2.1 Low-Voltage Power Supply
A~mbly
5-10
1.2.2 Isolation to a Display Station 1-1
5.3.2.2
-12V Regulator Card 5-10
1.2.3 Offline Symptoms 1-2
5.3.2.3 AC Capacitor 5-10
1.2.4 Formatted Buffer Symptoms
1-2
5.3.2.4 Model 1 Prime Power Box 5-10
1.2.5
Customer-Reported Failures 1-2
5.3.2.5 Model 2 Prime Power Box 5-10
5.3.2.6 Modell Ferro Transformer (50-Hz) 5-10
Section 2. Tools and Diagnostic Programs 2-1
5.3.2.7 Modell Ferro Transformer (50-Hz) 5-10
2.1 Maintenance Tools 2-1
5.3.2.8 Model 2 Ferro Transformer (50-Hz) 5-11
2.1.1 Customer Engineer Tool Kit 2-1
5.3.2.9 Model 2 Ferro Transformer (50-Hz) 5-11
2.1.2 Osci 1I0scope
2·1
5.3.2.
to
High· Vo lrage Power Supply 5-11
2.1.3 Logic Probes 2-1
5.3.2.11 Fuses 5-11
2.1.3.1 Description :2
~
~.3.3
Anaiog Components 5-11
2.1.3.2
Probe Usage 2-1
5.3.3.1 CRT
5-11
2.1.3.3 Probe Checkout 2-1
5.3.3.2 Yoke and Shields 5-13
2.1.3.4
Probe Repair
2-3
5.3.3.3 Modell Analog Card 5-13
2.1.4 Alignment Mask 2-3 5.3.3.4 Model 2 Analog Card 5-13
2.1.5 lOR FE Test Card 2-3 5.3.3.5 Modell Brightness and Contrast Controls 5-13
2.2 Diagnostic Programs 2-3
5.3.3.6 Model 2 Brightness and Contrast Controls 5-13
2.2.1 Test Patterns 2-3 5.3.3.7
Power Control Switch 5-14
2.2.2 Requesting RFT Patterns
2-4 5.3.4 Logic Components 5-14
2.2.2.1 Local Display Stations 2-8
5.3.4.1 Logic Card 5-14
2.2.2.2 Remote Display Stations
2-8
5.3.4.2 logic Board 5-14
2.2.3 Online Tests (Ol Ts) 2-9
5.3.5 Keyboard Components 5-14
5.3.5.1 Keyboard from Display Station
5-14
Section 3. Symptom Index
3-1
5.3.5.2 Keyboard Top Cover 5-14
3.1 Symptom I ndex Usage 3-1
5.3.5.3 Keyboard A~mbly from Bottom Pan
5-14
3.2
Developing Symptoms 3-1
5.3.5.4 Audible Feedback Assembly 5-14
5.3.5.5 Keybutton
5-15
Section 4. Trouble!'hooting Diagrams
4-1 5.3.5.6 Type A Switch Module
5-15
5.3.5.7 Type A Spacebar Assemblies
5-17'
Section 5.
Checks, Adjustments, and Removals 5-1 5.3.5.8
Keybutton Support Modules - Type A
5.1 Checks
5-1 Keyboards Only 5-17
5.1.1
Display Station Test Using Test 5.3.5.9 Type B Module 5-18
Pattern 1
5-1
5.3.5.10 Type B Spacebar
5-20
5.1.2 Display Station Operational Test 5.3.5.11 Circuit Board and Electronics Assembly -
(without Test Pattern 1)
5-2
Type B Keyboards Only
5·20
5.1.3 Voltage Checks
5-3
5.3.6 Audible Alarm (Optional Feature) 5-20
5.1.3.1
low-Voltage DC Checks
5-3
5.3.7
Security Keylock (Optional Feature) 5-20
5.1.3.2
High·Voltage Check
5-4
5.3.8 Selector Light-Pen (Optional Feature)
5-21
5.1.3.3
Arc-Suppression Check 5-4
5.3.9 Operator Identification Card Reader
5.1.3.4 6.3V AC Check
5-4
(Optional Feature) 5-21
5.1.3.5 High-Voltage Power Supply Check
5·5
5.4 Type B Keyboard Maintenance Aids 5-21
5.1.4
Keyboard Checks
5-5
5.4.1 Cleaning
5-21
5.1.4.1 Voltages
5-5
5.4.2 Liquid Spills
5-21
5.1.4.2
Key Module and Encoding - Type A 5.4.3 Key Modules
5-21
Keyboards Only
"
5-5
5.4.4 Contamination Shields 5-21
5.1.4.3 Output Codes
5-6
5.4.5 Protective Membrane/Shield 5-22
5.1.4.4
Shift Key Modules - Type A Keyboards Only
5-6
5.4.6
G rou nd Check 5-22
5.1.4.5
Spacebar Assembly Mechanical Checks
5-6
5.4.7
Ground Loop Isolation 5-22
5.2
Adjustm ents
5-6
5.4.8 Crooked or loose Key tops
5-22
5.2.1
Display I mage Adjustments
5-6
5.2.1.1
Brightness
5·7 Section 6. Reference Data
6-1
5.2.1.2 Contrast
5·7
6.1 Controls 6-1
5.2.1.3
Focus
5·7 6,1.1
External Controls
6-1
5.2.1.4 Yoke
5-7
6.1.2 I ntern:ll Cf'fltrols
6-2
5.2.1.5
Magnetic Centering Rings
5-7
6.2
I ndicatC' " 6-2
5.2.1.6
Modell Analog Card Adjustments
5-7
6.2.1 External I nd Icalo. ;,
6-2
Contents
iii