Selecting A 5Elftest - HP 9122D Service Manual

TROCBLESHOOTING
13 Format disc
14 PLL test
1 min.
1-2s
Same as above but on drive 1.
The free running frequency of the PLL is
checked. The disc in drive 0 is used
for the test. and its format is destroyed
by the testing procedure.
NOTE: Format the disc again if you are going
to run test 8-11.
*
Time shown is for the format generated by test 12 or 13. This time will be different
if the disc is initialized with another interleave factor.
Selecting a Selftest
NOTE
A disc must be in the drives to perform test 6 through 14. En-
sure that the discs are not write protected and that they· are
initialized scratch discs.
The service diagnostic testing function allows selection and looping of any of the test choices in the follow-
ing table.
To initiate a test, perform the following:
1. Apply power to the unit and allow the power-on selftest to complete.
2. Install formatted, unprotected discs if tests, 6 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 (SW3) to the desired test number (see figure 4- 3)
4. Short the TEST jumper pins 17, see figure 4-1 or 4- 2, with a jumper to start the test; LEAVE SHORTED
TO LOOP ON THE SELECTED TEST.
When a selftest is initiated, the HP 9122 leaves its normal peripheral mode and enters the diagnostic test
mode. The LED blinks (to show that the LED works).
The results of a successful test are displayed by the FAULT-LED blinking. A failure causes the LED to
stay on. Results are displayed for five seconds after a test is completed, followed by a complete power-up
sequence.
o
L
o
oCJo
TEST
~ (BI~
SELECiED
Figure 4- 3. Rear view of HP 9122 disc drive.
4-5