Digital Equipment RW504-ZA, Руководство по обслуживанию

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Table 4–6 (Cont.) Electronic Core Tests
No. Test Name Description
41 SCSI Connector
Loopback Test
(interactive) Runs a loopback through SCSI connectors, checking
proper operation of the SCSI drivers, receivers, and cables.
Requires an external loopback hood with terminator
power. Will not run if initiated via SCSI; if so, it reports
error FCH
Test Did Not Run
.
42 Optical Sensor Test
(and Mailslot)
(interactive) Checks the status of the two optical sensors. Also checks
the s the Mailslot sensor (see test 43). Three ‘‘0’’s are
placed on the control panel display; one at the left position
in the display, one in the middle of the display, and one
at the right position in the display. The mark is an open
zero if the sensor is not blocked, and a zero filled in with
lit segments if a sensor is blocked. No FRU is returned.
43 Mailslot Sensor
Test (and Optical
Sensor)
(interactive) See description for test 42.
50 Find Home
Sequence Moves the picker to a known ‘‘home’’ spot. This test
assumes nothing about the state of the mechanics. The
‘‘home’’ location is at the lower left position of the box. The
servo system is initialized to the ‘‘home’’ location. It then
automatically runs test 51.
51 Carriage /Picker
Assembly
Calibration Test Runs the portion of the mechanism recalibration related
to the optical sensors. It measures sensor offsets and
calculates picker tilt and droop. This test assumes that
the mechanics and servo system are functional.
60 FRU Isolation Test Assumes that something has physically failed, either
electronic or mechanical. A series of special low level tests
are run to select the three (or fewer) FRUs that are most
likely to be at fault. Tests 30, 31, 33, 35, 36, 40, and 50
are executed as a part of the isolation process. Returns an
error code, three suspect FRUs in decreasing order of fault
probability, and a time stamp.
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Troubleshooting and Diagnostics 4–39