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6.2.2
Internal Indicator (SWEEP INDIC)
6-3
Section 7.
Component Locations
7-1
6.2.3
Arc-Suppression Neon
6-3
6.3
Keyboards (Optional Feature)
6-3
Section 8.
I nstallation Instructions
8-1
8.1
General
8·1
6.3.1
Types of Keyboards
6-3
8.2
Installation
8·1
6.3.2
EBCDIC Keyboard Codes
6-3
6.4
ASCII Options
6-3
8.2.1
Line Voltage Check
8·1
6.4.1
ASCII Character Generators (Optional
8.2.2
Feature Installation
8·1
Features)
6-3
8.2.3
Prepowe~-On
Checks
8·2
6.4.2
ASCII Keyboards (Optional Features)
6-4
8.2.4
Power-On Checks
8-2
6.5
Reference Diagrams
64
8.2.5
Hexadecimal Address Label
8-2
Index
. X-1
Diagrams
1·1
3277 Maintenance Approach
1·2
5·11
Module Removal (Type B)
5-19
2-1
Logic Probes
2·2
5·12
Circuit Board and Electronics Assembly
2·2
Alignment Mask, Model 1
2·3
(Type B)
5·19
2-3
Alignment Mask, Model 2
24
5-13
Base Plate Ground Studs (Type B)
5·19
24
Test Pattern 1 (USA EBCDIC)
2-5
5·14
Spacebar Pivot Removal (Type B)
5-20
2-5
T est Pattern 2
2-6
6·1
External Controls and Indicators
6-1
2-6
Test Pattern 3
2-6
6-2
Typewriter Keyboard
6-5
2·7
Test Pattern 5 (USA EBCDIC)
2·7
6-3
Operator Console Keyboard
6-5
2-8
Character Differences for ASCII and
6-4
Data Entry Keyboards
6-6
WTC Languages
2-8
6·5
USA EBCDIC Keyboard Codes (2 Sheets)
6-7
2·9
Test Pattern 10 Numbers
2-8
'
6
•
6
WTC Language Keyboard Codes
6-9
3-1
Test Pattern 1, Model 1
3-7
6-7
ASCII and WTC Language Keyboard Codes
6-9
3·2
Test Pattern 1, Model 2
3-7
6=8
Logic Card Data (2 Sheets)
6-10
3·3
Test Pattern 2
3·7
6·9
Probe Pin Data
6-12
3-4
Test Pattern 3
3-7
6-10
Keyboard Feature Jumpers
6-13
3-5
Yoke Back Too Far on CRT Neck
3-7
6-11
Type A Keyboard Encoding
6-13
3-6
Yoke Tilted
3-7
6·12
Board Layout by Card Function - Without
3-7
Centering Rings Not Adj usted Properly
3-8
Features (Card Side View)
6-14
3-8
Character Height Too Small
3-8
6-13
Board Layout by Card Function - With
3-9
Glow Only on CRT
3-8
Features (Card Side View)
6·15
3·10
Single Horizontal Line on CRT
3-8
6-14
Board Layout Pin Identification Data
3-11
Model 1 Raster
3-8
(Pin Side View)
6-16
3-12
Model 2 Raster
3-8
7-1
Model 1 Locations, Front View
7-1
3-13
Cursor in Every Row
3-9
7-2
Model 1 Locations, Left·Side View
7-2
3-14
Box in Every Character Position
3-9
7-3
Model 1 Locations, Rear View
7-3
3·15
No Horizontal Sync
3-9
17-3.1
Location of +5V and +34V Fuses (Model 1)
7-4
3-16
No I nterrow Spacing
3-9
74
Model 2 Locations, Front View
7·5
3·17
Correct 0 isplay after PO R
3-9
7·5
Model 2 Locations, Right-5ide View
7-6
3-18
Out of Focus I mage
3-9
I
7·5.1
Location of +5V and +34V Fuses (Model 2)
7·7
3·19
Yoke Horizontal Return Line Open
3-10
7-6
Model 2 Locations, Left-Side View
7-8
3-20
Open in Yoke Horizontal Winding
3·10
7-7
Type A Keyboard Locations
7·9
3·21
1/2 Vertical Yoke Open
3·10
7-8
Type A Keyboard Pin Assembly and Terminal
3·22
Horizontal Yoke Open
3·10
Location
7·10
3-23
Vertical Yoke Open
3-10
7·9
Low-Voltage Printed Circuit Board
7·11
4·1
Display Station Troubleshooting Di&grams
7-10
Low-Voltage Printed Circuit Board Shield
7-12
(29 Sheets)
4-3
7·11
Model 2 Voltage Distribution Board
7-12
5-1
OFF-PUSH Switch Adjustment
5-9
7-12
Model 1 Prime Power Box
7·13
5·2
Switch Module Removal (Type A)
5·15
7-13
Brightness and Contrast Control Terminals
7-13
5-3
Unsoldering Lead Frame Terminals (Type A)
5-15
7-14
High-Voltage Power Supply
7·14
54
Lead Frame Removal (Type A)
5-15
7-15
Model 1 Arc-Suppression Board
7-14
5-5
Switch Plunger Return Spring Positioning
7-16
Analog Card (2 Sheets)
7-15
(Type A)
5-16
7-17
Type B Keyboard Locations
7-17
5-6
Switch Module Orientation (Type A)
5·16
7-18
Type B Keyboard Assembly
7·18
5-7
Torsion Bar Removal (Type A)
5-17
7-19
Type B Keyboard Assembly Pin and Terminal
5-8
Spacebar Guide Module Removal (Tyoe A)
&17
Locations
7-19
5-9
Screw Loosening (Type B)
E-l?
8-1
50-Hz Ferro TB·1
8-1
5-10
Keyboard Assembly
Separatio~
(Typ". HI
5~R
f
;,)-1
Data F!ow (Foldout; at back of manual)
FO-1
iv
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