Troubleshooting Flowchart - HP 9122D Service Manual

TROliBLESHOOTISG
The following procedures should be referenced when referred to by the "Troubleshooting Flow Chart".
PROCEDLRE PO (Sclftest indicator not on at power-on)
1. Check primary fuse
1. Check setting of the primary voltage select switch (115/220V) see Figure 2-l.
3. Check power supply voltages on the controller/power PCA. (See Figure
4-1, 4- 2).
Repair by
replacing
fuse~s
F2
(-12V
and
+
5V) or
F 3
(+
12V) on controller PCA or replacing controller PCA.
PROCEDURE PI (Fails power on self test with out media in drive)
1. Check that alll internal cables in the drives are connected properly and are seated correctly.
2. Perform Tests 4 and 5 (seek or track 0 test) or perform TRK_ 0 test in the 55/80 Exerciser
5ER VC module.
91220
If one drive fails then replace the failing drive mechanism.
If both drives fail replace the controller/power PCA.
91225
If any of Tests
0- 3
fail then replace controller/power PCA.
If Tests ()- 3 pass, replace the drive mechanism.
PROCEDURE P2 (Fails power-on self test with media installed)
1. Perform Tests 6 and 7 (measures index period) or perform MTR_5PO test using the 55/80 Ex..-
erciser SERve module.
If disc access light comes on but drive fails then replace drive.
Ii disc lccess light does not come on then replace controller/power PCA.
PROCEDURE P3 (Consistent failure)
In some cases, media may cause this type of problem. Refer to statement concerning media in the "General"
information on page
4-6.
If the 55/80 Exerciser is available, do the following steps:
4--8
1. Perform the LOOPBAK test in the 55/80 Exerciser
"~IANUAL"
module (This tests the 9122
I/O)
If test fails then replace
9122
controller/power PCA
If test passes, go on to step two.
2. Perform the llNIT test in the 55/80 Exerciser "lVIANUAL" module on each unit. (This tests the
read/\vrite capability of the drive and the controller PCA.)