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DEC VT420 User Manual

DEC VT420
81 pages
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Contents
About This Guide vii
1 VT420 Models and Features
1.1 VT420 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 VT420 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Troubleshooting and Testing
2.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 VT420 Self-Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.2 How to Type an Escape Character . . . . . . . . . . . . . . . . . . . 11
2.2.3 Power-Up Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2.4 DEC-423 Port Loopback Test (6-Pin) . . . . . . . . . . . . . . . . . 14
2.2.5 RS-232 Port Data Lines Loopback Test
(25-Pin, Worldwide Model Only) . . . . . . . . . . . . . . . . . . . . 16
2.2.6 RS-232 Port Control Lines Loopback Test
(25-Pin, Worldwide Model Only) . . . . . . . . . . . . . . . . . . . . 17
2.2.7 Printer Port Loopback Test (6-Pin) . . . . . . . . . . . . . . . . . . . 18
2.2.8 Screen Alignment Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3 Printer Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.4 Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
iii

Table of Contents

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DEC VT420 Specifications

General IconGeneral
BrandDEC
ModelVT420
CategoryTouch terminals
LanguageEnglish

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