Epson Equity 320SX PLUS - Manual (Page 202)

If it does not, you may need to change the internal
setting of the computer’s parallel port for a parallel
printer (or serial port for a serial printer). To do this,
use the MS-DOS MODE or SETMODE command. See
your printer manual and the MS-DOS manuals for more
details.
5. Many application programs (such as word processors)
must be set up properly before they can use a printer.
Check your program manual to see what customizing
may be required.
6. If you are using an application program that requires a
printer driver, make sure the driver is installed properly.
See your application program manual for instructions.
Also see your printer manual for additional instructions
on using your printer with application programs.
7. Try running the Printer adapter diagnostics test if you
have a parallel printer, or the Communication adapter
test if you have a serial printer. Appendix B describes
these tests. If the test indicates an error, contact your
printer dealer.
Option Card Problems
If you install an option card and it is not functioning
properly, check the following:
1. Is the option card installed correctly? The most common
problem with option cards is a loose connection. Make
sure the card is well-seated in its slot. Check the
installation procedure described in Chapter 6 and also
see the instructions that come with the card.
2. Did you set the necessary DIP switches or jumpers on the
option card? See the card’s manual for instructions.
Troubleshooting C-17