- EPSON Equity 386/20 - User Manual

Appendix B
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. The diagnostics programs check the
internal devices such as ROM, RAM, keyboard controller, timer,
video controller, floppy disk driver, and hard disk controller.
When you turn on the power, your system performs the tests
described in this appendix. If an error is found, a specific error
number and error message appear on the screen. If the error is
serious, the computer cancels further checking and halts system
initialization. The error message remains on the screen, but the
computer is inoperable.
If the error is not serious, the computer displays an error message and
waits for you to resume further checking. You see this prompt:
(Resume = “F1” key)
Write down the error message and code number, and then press F1
to resume. Report the error message and code number to your dealer
when requesting repairs.
When the self test finds a problem, the system checks all the
hardware. This check may take about one minute; during this time,
you see only the power light on the computer. After checking the
hardware, the diagnostics continue.
System Device Check
The computer first checks its internal devices such as the ROM. If a
malfunction is found, the computer displays an error message. In
some cases, it may halt with no further information. If this happens,
contact your dealer as soon as possible.
Power-on Diagnostics B-l