VT100.net: Digital VT102 User Guide

Table 9-1 Problem Checklist
Symptom | Possible Cause | Corrective Action
--- | --- | ---
ON LINE or OFF LINE is on with no cursor on screen. | Screen brightness too low. | Enter SET-UP and increase screen brightness.
ON LINE and OFF LINE are not on with no keyboard response. Cursor on screen. | Keyboard cable not connected to terminal. | Connect keyboard cable.
KBD LOCKED is on. | Characters are typed faster than terminal can transmit them. | Cleared when terminal transmits characters in keyboard character buffer to computer.
Locked condition occurs when terminal is receiving characters with half-duplex communication selected (by modem control SET-UP feature). Terminal cannot transmit characters when receiving characters in half-duplex. | Cleared when line turns around and terminal can transmit keyboard characters.
Print operation selected while off-line. | Cleared when print operation ends.
Terminal not connected to computer correctly. Communication line signals are not correct. | Cleared when correct connection exists between computer and terminal.
Terminal does respond to typed characters. | Computer cannot update screen. | Press NO SCROLL.
Computer turns keyboard off. | Computer turns keyboard on.
Garbled or error () characters or no characters appearing on screen. | Incorrect SET-UP feature selected. | Correct SET-UP features.
Computer error occurred. | Check computer system.
Two characters appear on screen for each character typed. | Local echo on. | Turn local echo off.
Several bell tones during power up, reset or recall. | Read or write problem with user permanent memory. | Check SET-UP feature settings and try save operation.
Printer does not print characters. | Printer and terminal features do not match. | Check SET-UP feature settings of terminal and printer.