HP 9121D/S User Manual page 13

HP 9121/22 D/S
HP 9122D/S
The service diagnostic testing function allows selection and
looping of any of the test choices in the following table.
To initiate a test, perform the following.
1. Apply power to the unit and allow the power-on self test to
complete.
2. Install formatted, unprotected discs if tests 4 through 14 are
to be performed. (Note: Scratch discs should be used, as some
tests destroy the data and format)
3. Set the HP-IB ADDRESS switch to the desired test number. See
test descriptions on the following page.
4. Short the TEST jumper pins J7, with the jumper to start the
test; LEAVE J7 SHORTED TO LOOP ON THE SELECTED TEST.
The fault LED will blink once at the beginning of the test,
followed by:
Test pass indication Fault-LED blinks 5 times
Test fail indication Fault-LED stays on
Test results are displayed for 5 seconds followed by a complete
power-up sequence.
When looping on a test, the following occurs:
1. A power-up sequence; indicated by the blinking LED
2. Test execution; indicated as follows
A. If the test passes; the LED blinks The test is repeated
until the loop jumper is removed.
B. If the test fails; the LED stays on. The test is not
repeated.
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