Selftests - HP 9121D/S User Manual

HP 9121/22 D/S
SECTION V
DIAGNOSTICS
[1] SELFTESTS
HP
912ID/S
POWER-ON SELFTEST
Activated when power is applied: Checks RAM, ROM, and FDC
circuitry. Test pass indications: The red self-test LED (behind
the grill, near the power switch) blinks on 5 times, then off.
If a test fails, the LED stays on for 5 seconds.
If the ROM or RAM is defective: the LED will never come on.
If the FDC is defective: the LED comes on for 5 seconds, then off.
USER CONFIDENCE TEST
Activated by setting the "TEST" switch (far left segment of the
HP-IB address switch) to the downward, then upward position after
the Power-on Self-test has completed. With no discs inserted,
RAM, ROM, HP-IB and FDC chips are tested. If a disc which is NOT
write-protected is inserted into a 9121S or into BOTH drives of a
91210, the seek track 0, motor speed, format, and verify tests
are performed.
Expected indications: The complete test lasts 1 minute for the
91210, 30 seconds for the 9121S. Drive access LED(s) show disc
activity, the self test LED blinks 10 times, then goes off. If any
test fails, Self test LED comes on for 5 seconds, then off.
Always return the TEST switch to the upward, normal operating
position. This switch
is
used for the User Confidence test only.
5-1