Printer Problems - DEC VT420 Service Manual

To run the test:
1. Set up the terminal (Sections 2.2.1 and 2.2.2).
2. Check the following settings in the Display Set-Up screen:
• Make sure the columns feature is set to
• Set the number of lines/screen feature to
3. Type ESC # 8. The screen fills with a pattern of uppercase E's.
4. Perform the adjustment procedures in Chapter 4.

2.3 Printer Problems

If the VT420 is connected to a local printer, you may have to troubleshoot
some printer problems. The following procedure helps you isolate the
problem to the printer or the terminal.
To troubleshoot printer problems:
1. Run the power-up self-test (Section 2.2.3).
If the terminal passes the test, go to step 2.
2. Run the printer port loopback self-test (Section 2.2.7).
If the terminal passes this test, go to step 3.
NOTE
If your terminal passes the above tests, it is running correctly.
The problem is probably not in the terminal.
3. Test the printer. See your printer's service guide for the correct
procedures. If your printer is operating correctly, go to step 4.
4. Go to the Printer Set-Up screen.
• Check the following settings. They must match the printer's
settings. See your printer's service guide for the correct settings.
Baud rate
Data bits/character
Parity
• Make sure
5. Make sure you are using the correct cable between the terminal and
printer (Appendix A). Make sure the connections are secure at both
ends of the cable.
appears on the VT420 status line.
Printer: Ready
Troubleshooting and Testing 19
.
80 Columns
24 Lines/Screen
.