Epson Apex 20020 - Manual (Page 171)

The remainder of this appendix describes the tests you
can
run
on the system’s internal devices and on the optional devices
installed on your computer. The program displays the title of
each check on the screen.
Note
For a complete list of the error codes and messages these
tests may display, see the table at the end of this chapter.
System Board Check
Use this option to check the operation of each major
component on the system board, including:
The 80286 CPU chip
The system ROM
The rea1-time clock, CMOS RAM, and battery
The main integrated circuits.
The checks made on the 80286 CPU chip are extremely
comprehensive. They ensure that the CPU instruction set is
functioning correctly.
If an error is reported, write down the error code and message,
or print them out, and contact your Customer Care Center.
Attempting to correct system board errors yourself may violate
your warranty agreement.
Performing System Diagnostics C-7