Epson EL 486UC - Manual (Page 114)

Controller Problems
You see a
controller
error for
the
hard disk drive controller
or the I/O port controllers when you start your system.
The indicated controller on your system board may be faulty.
If you have an option card with a controller that will work with
your device, you can install it and change the jumper settings
on the system board to disable the built-in controller. You can
then continue to use your system until it is convenient for you
to have it serviced.
External Cache Problems
The
cache displayed
by power-on
diagnostics program
is incorrect.
You may have installed the external cache chips incorrectly.
They may be the wrong type, or they may not be inserted all
the way.
Also, you may not have changed your SETUP program to
recognize the new cache. Make sure you have set the
External Cache
option to
Enable
and set both the
Shadow BIOS ROM
and the
Shadow Video
ROM options to
Cacheable
or
WP-Shadow.
See Chapter 3 for information on installing external cache and
Chapter 1 for instructions for using the SETUP program.
Troubleshooting 6-13