Teledyne ADFM Analog Output Module, Техническое руководство, Страница: 59 / 156

ADFM Troubleshooting
Symptom: Ancillary Data VXDR, VDD1, and VDC are outside the range
listed in section “Maintenance and Troubleshooting”.
Possible Cause: Batteries or Power Supply. ADFM Motherboard.
What to Do: Replace batteries. Check power supply.
Replace Motherboard. Refer to section “Least Replaceable
Assembly Fault Isolation,” page 6-6, and “Power,” page 6-7 for
further information and trouble shooting.
Symptom: Transmit Test Failure
Possible Cause: Cabling between the Motherboard and the Electronics Unit’s
rear panel Transducer Connector. Transducer Cable or
connectors. ADFM Motherboard.
What to Do: Refer to section “Least Replaceable Assembly Fault Isolation,”
page 6-6.
Symptom: “Loop Test Failure”. An occasional loop test failure may be
normal since this is a statistical test. If the percentage of
loop test failures is large (>10%) a problem may have
arisen.
Possible Cause: Transducer not connected properly, or defective. High
interference source. ADFM Motherboard.
What to Do: Refer to section “Least Replaceable Assembly Fault Isolation,”
page 6-6.
Eliminate interference source
1,
or shield transducer
environment. From BBTALK type “PT3” followed by a CR. The
Correlation Magnitude at Lag 0 should be 255, at Lag 7 it
should be typically < 20. Also, the Amplitude should be typically
< 65. Otherwise it may indicate a high source of interference.
Replace Motherboard.
Symptom: Any RAM Test failure.
Possible Cause: ADFM Motherboard.
What to Do: Replace Motherboard.
Symptom: Clock Interrupt failed.
Possible Cause: ADFM Motherboard.
What to Do: Replace Motherboard.
1
It is recommended to record the values for Correlation Magnitude, Amplitude, and the results of the transmit
test for later reference
.
ADFM Technical Manual (January 2000) page 6-5