Power-On Self Test; Write Protect Error On Initialization - HP 9122D Service Manual

Installa tion
~ledia ~lonitor
Through a feature called Tvfedia l\fonitor, the disc drive automatically monitors the cumulative use of each
individual disc. When the usage of a disc is approaching a level at which there is a risk of loss of data
through normal disc wear, the disc access light on the front panel blinks and a clicking sound is heard.
Commands will still be performed by the computer. However, after a command has been performed, the disc
drive immediately resumes the warning indication.
When the Media Monitor warning occurs, immediately copy your disc. If you continue to use this disc, the
disc drive will eventually automatically write protect the disc. After that time, you will only be able to
read data from the disc or copy the disc.
Power-on Self test
A power-on selftest is performed automatically when you turn on the disc drive. The selftest first checks
the HP-IB, FDC, RAM, and ROM, followed by a WRITE/READ test (if an initialized, non write-protected
disc is inserted). When a WRITE test is 'performed, it is done on a reserved area of the disc and no user data
is at risk. The Selftest LED acts as a pass/fail indicator and is visible through the air intake slots.
When an initialized, unprotected disc is inserted; read, write, and motor-speed tests are performed. A write-
protected disc will not allow the read and write tests to run. If the disc access light stays on after the nor-
mal testing time, an error within the disc drive has been detected. If an error occurs, refer to Chapter 4 for
troubleshooting procedures.
Write Protect Error on Initialization
A motor speed check is performed before initialization is performed. If the motor speed is on either side of
the tolerance allowed, a Write Protect Error is generated and the disc cannot be initialized. At this point,
insert another disc. If a write protect error is generated again, refer to Chapter 4 for troubleshooting
procedures. If no write protect error occurs with the second disc, then the first disc used is bad and should
be discarded.
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