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Troubleshooting and Testing

This chapter explains how to troubleshoot general problems on the VT420

terminal. The chapter also describes how to run the self-tests built into

the terminal and lists error codes for the tests.

2.1 Troubleshooting

Table 2–1 lists probable causes and solutions for general problems with

the terminal.

When you turn on the VT420 terminal, it performs a power-up self-test to

check for problems. If the test ﬁnds an error, the terminal may display an

error message at the upper-left corner of the screen (Section 2.4).

During the test, the LED indicators on the keyboard (Figure 2–1) ﬂash on

and off. If the test is successful:

• The keyboard makes one bell tone.

• The keyboard LEDs turn off.

• A VT420 OK message appears on the screen.

For details on the power-up self-test, see Section 2.2.3.

The worldwide model with PC TERM mode can use the standard ANSI

(LK401), short ANSI (LK421), or PC (LK443/LK444) keyboard. See

Installing and Using the VT420 Video Terminal with PC Terminal Mode

for details on the features of the different keyboards.

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DEC VT420 Specifications

General