Using The 55/80 Exerciser; Derrors - HP 9122D Service Manual

TROUBLESHOOTING
• Environmental problems
Temperature/humidity outside the range specified for product
Dusty or dirty environment
Noise on power lines (Transients or continual noise on lines from other equipment)
Strong electromagnetic fields in vicinity of the drive
• Compatibility problems
Drive can read discs it has written but cannot read discs written on other drives, such as software discs
or data recorded on other drives.
This type of failure can be identified as follows:
Format disc in each drive using any available host or Tests 12 and 13
Exchange the discs just formatted between drive 0 and I, then attempt to read the discs with a
host computer, or verify the discs. Tests 10 and II may be used for this purpose.
If discs cannot be read, then a compatibility problem exists. The defective drive cannot be iden-
tified in this way. An additional test which MAY indicate the possible defective drive involves at-
tempting to READ a disc which contains prerecorded software. (Tests 10 and 11 may also be used
for this test.)
Attempt to READ a known good disc, such as one containing prerecorded software. (Test 10 may
be used for this purpose)
• Infrequent read or write errors
The recommended method of verifying this type of failure is to use the tests in the R/W _TEST module
of the SS/80 Exerciser. These tests tra.nsfer data and when an error occurs the status information will
provide an indication of the possible cause of the problem. Refer to page 4-11 for a description of using
the SS/80 Exerciser. These tests can
be
set up to loop and can run for long periods of time.
If the error occurs on only one drive in a 9122D, then the drive is the probable cause of the problem. If
errors occur on both drives, then the controller is the most probable cause of the failure.
In the case of the 91225 there is no means of determining whether the disc mechanism or the controller
PCA is the cause of the problem.
Using the SS/80 Exerciser
The following information will help in interpreting the results obtained with the 55/80 Exerciser, and will
also assist in effective use of the Exerciser.
DERRORS
DERRORS may be indicated following the execution of certain commands. The .DERROR is basically
run-time status of the 9122 and provides additional information concerning what the product is doing.
4-11