How to troubleshoot a DEC Touch terminal when nothing appears on the screen?
If nothing appears on the screen of your DEC Touch terminal, first ensure all connectors on the terminal board are properly seated. If the issue persists, consider replacing the terminal board.
What to do if the screen display is distorted or jittery on a DEC Touch terminal?
If the screen display of your DEC Touch terminal is distorted or jittery, check the CRT yoke harness connector and reconnect it.
Why do keyboard LEDs stay on after powering up my DEC Touch terminal?
If, after powering up your DEC Touch terminal, one or more keyboard LEDs stay on, the issue may be with the keyboard or the terminal board. Consider replacing the keyboard or the terminal board.
What to do if F11 (Esc) does not work during self-tests on a DEC Touch terminal?
If F11 (Esc) does not work when running self-tests on your DEC Touch terminal, the transmit and receive speeds may be incorrect. Set the speeds to match the host in the Communications Set-Up screen. Also, incorrect bits per character or parity setting may be the cause, so set the data bits/parity feature to match the host in the Communications Set-Up screen. The stop bits setting may also be incorrect; set the stop bits feature to match the host in the Communications Set-Up screen. If none of these adjustments work, the terminal board may be faulty and require replacement.
Why does my DEC Touch terminal display different characters than typed in local mode?
If, in local mode, your DEC Touch terminal screen displays different characters than those typed, the alternate character set may be selected. Clear this by selecting the Reset field in the Set-Up Directory. If you are in a worldwide location, the wrong keyboard language may be selected. Check the keyboard language feature in the Set-Up Directory.
Why is my DEC Touch terminal screen blank with just a blinking cursor?
If the screen is blank except for the blinking block cursor in the lower-right corner of your DEC Touch terminal, it might be because the screen has been inactive for one-half hour. Press any key to restore the screen display. Alternatively, the CRT saver feature may be activated, so replace the CRT/yoke/bezel assembly.
What causes modem speed select signals not to work with a DEC Touch terminal?
If, when using a modem with your DEC Touch terminal, the modem speed select signals do not work, check all cables and cable connections. The terminal board may also be the cause, so replace the terminal board. The modem’s XON/XOFF settings may also be incompatible with the terminal, so use a modem with compatible XON/XOFF settings.
What to do if the bell tone doesn't sound on my DEC Touch terminal?
If the bell tone does not sound, but VT420 OK appears on the screen of your DEC Touch terminal, it may be because the VT420 communication port cable is loose. Check the transmit and receive speeds in the Communications Set-Up screen. Another possible cause is an incorrect baud rate. Change the feature setting to On Line in the Global Set-Up screen. If the on-line/local feature is set to Local, perform loopback tests. If communication port circuits are faulty, replace the terminal board.
How to fix an off-center or rotated screen on a DEC Touch terminal?
If the screen of your DEC Touch terminal is off center or rotated, it may be due to interference from electromagnetic energy. Adjust the screen by using the Screen Align field in the Set-Up Directory screen.
Why doesn't the set-up cursor appear on my DEC Touch terminal?
If the set-up cursor does not appear on your DEC Touch terminal, the terminal board may need to be replaced.
Explains the different VT420 terminal models and their common features.
Provides methods for diagnosing and resolving terminal problems and running self-tests.
Details procedures for removing and replacing field replaceable units like the CRT and terminal board.
Guides on aligning and adjusting the VT420 monitor's screen and display characteristics.
Covers how to access, change, save, and recall terminal configuration settings.
General| Model | VT420 |
|---|---|
| Release Year | 1990 |
| Display Type | Monochrome CRT |
| Category | Terminal |
| Manufacturer | DEC (Digital Equipment Corporation) |
| Character Set | ASCII |
| Communication Interface | RS-232 |
| Connectivity | Serial |
| Baud Rate | Up to 38, 400 bps |
| Protocols | VT100 |
| Emulation Modes | VT100, VT52 |
| Power Supply | 120/240 VAC, 50/60 Hz |
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