Epson 10020 - Manual (Page 154)

Appendix C
Power-on Diagnostics
The built-in memory (ROM) of your computer contains a
series of diagnostics programs, which your computer runs
automatically every time you turn on the power. These
programs check internal devices such as ROM, RAM, the
timer, the keyboard controller, and the diskette drives.
When you turn on the power, the computer performs the tests
described in this appendix. If it finds an error, it displays a
specific error number and error message on the screen.
If the error is serious, the computer cancels further checking
and halts system initialization. The error message remains on
the screen, and you can no longer operate the computer. If this
happens, contact your Customer Care Center as soon as
possible. Report both the error message and code number.
If the error is not serious, the computer waits for you to resume
further checking. You see this prompt:
F1 key to resume
Write down the error message and code number, and then press
F1 to resume. Report the error message and code number to
your Customer Care Center when requesting repairs.
System Device Check
The computer first checks its internal devices, such as ROM. If
it finds a malfunction, it displays an error message. In some
cases, the computer may halt with no further information.
Power-on Diagnostics C-1