Digital Equipment RW504-ZA, Service Manual

Page: 90 / 220

These tests are run from the control panel and are divided into four groups:
sequence tests, exerciser tests, electronic core tests, and mechanism core tests.
These tests are fully explained in Section 4.10. Instruction for running these
tests are provided in Section 4.9.2.
4.9.1 Offline Diagnostics
A diagnostic utility called DOSDASS2 is available from Hewlett-Packard for
accessing the optical disk library through the SCSI bus.
DOSDASS2 fully exercises either standalone multifunction optical drives or
autochangers that contain multifunction optical drives. Information for obtaining
and using DOSDASS2 is found in Appendix B.
4.9.2 Internal Diagnostic Tests
An extensive set of internal diagnostic tests is available for the autochanger.
Except for the power-on sequence test, the running of tests is not automatic. The
operator may initiate each test from the control panel.
A test is actually a sequence of separate tests that are called and run in series.
Each test exercises a specific portion of the autochanger. Each test is identified
by a test number that is requested when the test is to be run. Tests return either
PASS or FAIL .
All the tests are combined into groups of similar functions.
Sequence Tests (1 - 9) execute sequences of individual tests within the range of
test 10 through test 69. Sequences may be used to either test many portions of
the autochanger or as an autochanger exerciser. When a sequence test is selected,
the autochanger executes the tests in sequence until an error occurs or until the
sequence successfully completes.
Exerciser Tests (10 - 29) do simple autochanger mechanism moves to check out
elementary functions.
Electronics Core Tests (30 - 49) run basic tests of the autochanger controller PCA.
Autochanger Mechanism Core Tests (50 - 75) run basic tests of the autochanger
mechanism. These tests make combinations of moves that can help to detect the
source of failures.
Note
Section 4.10 contains a complete listing and description of these diagnostic
tests. The following instructions provide information for running these
tests.
4–32 Troubleshooting and Diagnostics