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DEC VT420 User Manual
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C
Physic
al/Functional
Diagrams
C
This
appendix
shows
the
components
and
pin
assignments
for
the
North
American
and
worldwide
models
of
the
VT420
video
terminal.
Figure
C–1
shows
the
components
of
the
North
American
model.
Figure
C–2
shows
the
components
of
the
worldwide
models.
63
70
72
Table of Contents
Default Chapter
3
Table of Contents
3
About this Guide
7
1 VT420 Models and Features
9
VT420 Features
9
VT420 Model Differences
11
2 Troubleshooting and Testing
12
Troubleshooting
12
VT420 Video Terminal with Keyboards
13
Troubleshooting the VT420
14
VT420 Self-Tests
18
Before You Start
19
How to Type an Escape Character
19
VT420 Self-Test Chart
20
Power-Up Self-Test
21
DEC-423 Port Loopback Test (6-Pin)
22
VT420 Rear Connector Panel and Loopback Connectors
23
RS-232 Port Data Lines Loopback Test (25-Pin, Worldwide Model Only)
24
RS-232 Port Control Lines Loopback Test (25-Pin, Worldwide Model Only)
25
Printer Port Loopback Test (6-Pin)
26
Screen Alignment Test
26
Printer Problems
27
Error Codes
28
VT420 Display Error Codes
28
3 Removing and Replacing Frus
30
Top Cover
30
Crt/Yoke/Bezel Assembly
34
Terminal Board Assembly
42
Keyboard
44
CRT Disposal (Digital Service Representatives Only)
46
4 Adjusting the Video Monitor
50
Aligning the Screen
50
Set-Up Directory Screens
51
Screen Align Screens
52
Monitor Adjustments
53
Monitor Adjustment Controls
53
Before You Start
54
Displaying the Screen Test Pattern
54
Screen Test Pattern
54
Screen Control
55
Subcontrast
55
Rotation
55
Rotation and Centering Adjustment
56
Horizontal Width
57
Vertical Height
57
Vertical Linearity
57
Centering
58
Focus
58
5 Using Set-Up
59
Displaying Set-Up Screens
59
Set-Up Directory Screens
60
Changing Settings
61
Saving Set-Up Values
61
Recalling Set-Up Values
61
Modems, Cables, and Documentation
62
Modems
62
Cables
62
A.2 Cables
62
VT420 Cables
64
Related Documentation
65
A.3 Related Documentation
65
VT420 Recommended Spares
66
VT420 Models
66
B.1 VT420 Models
66
Recommended Spares
68
B.2 Recommended Spares
68
Keyboard Models
69
B.3 Keyboard Models
69
Physical/Functional Diagrams
71
VT420 North American Model
72
VT420 Worldwide Models
74
4
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DEC VT420 Specifications
General
Brand
DEC
Model
VT420
Category
Touch terminals
Language
English
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86 pages
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