Epson 20, 386 Power-onDiagnostics, System Device Check, key), Power-onDiagnostics B-l

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.

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