Epson 486SX User Manual page 180

4. If your printer is properly set up but is still not functioning,
test it from the MS-DOS level. When the screen displays
MS-DOS command prompt (such as
the screen on your printer.
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 and
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
printer driver, make sure the correct driver is installed. 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 Parallel port (printer interface) diagnostic
test if you have a parallel printer, or the Serial port
(RS-232C) test if you have a serial printer. Appendix C
describes these tests. If the test indicates an error, contact
your printer dealer.
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