Epson 486SX - Manual (Page 181)

Option Card Problems
If you install an option card and it does not function properly,
check the following:
1.
2 .
3 .
4.
5 .
6 .
7 .
Is the option card installed correctly? Make sure it is
well-seated in its slot. Check the installation procedure
described in Chapter 6 and also see the instructions that
come with the card.
Did you set the necessary DIP switches or jumpers on the
option card? See the card’s manual for instructions.
Did you set the necessary jumpers on the main system
board? See Chapter 6 for more information.
Did you run the Setup program to redefine your computer’s
configuration after installing the card? See Chapter 2.
Did you install a network option card in your computer?
Some network option cards require your computer to
generate an early input/output ready signal to operate
properly. If you have trouble using your network card, set
jumper JP15 on the main system board to position A to
enable the early input/output ready signal. Then try using
the network card again. If it still does not operate correctly,
contact your dealer.
If you used the option card to add an external device to
your computer, did you use the proper cable to connect the
device to the connector on the back panel?
Did you perform the correct setup procedures for the
software you are using with the option card? See your
option card or software manual for instructions.
B-26 Troubleshooting