About This Guide - DEC VT420 Service Manual

This guide describes how to service the VT420 monochrome video
terminal. The guide is for Digital's service personnel.
The guide has five chapters that cover the following topics:
VT420 models and features
Troubleshooting and testing
Removing and replacing field replaceable units (FRUs)
Adjusting the video monitor
Using set-up
Appendices provide information on the following topics:
Modems, cables, and related documentation
VT420 models and recommended spares
Physical/functional diagrams
Tools Required
You need the following tools to service the VT420 video terminal:
Tool
Anode discharge tool
25-pin, RS-232 EIA loopback connector
Metric measuring tape
Two 6-pin, DEC-423 loopback connectors (modular jack)
Phillips screwdriver, number 2
Tuning wand
Video alignment tool

About This Guide

Part Number
29-24717-00
12-15336-00
29-25342-00
12-25083-01
29-11005-00
29-23189-00
29-26128-00
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