7200 TROUBLESHOOTING
E - 17
9.3 "Excessive Tracking Signal Noise" Error Displayed
This is a notification, NOT a fault. If no other faults are occurring, the system is
still functioning nominally.
9.4 Large Signal Fluctuation During AST Operations
If a large signal fluctuation occurs during AST operations, check the low speed
potentiometer at the drive cabinet, and verify that the antenna is not overshooting.
9.5 Poor Tracking Performance
If the system is not adequately tracking:
1. Check settings of tracking parameters. Refer to the table in paragraph 5.8 of
this manual that lists the parameters for the tracking mode of the target.
2. Verify that the steptrack step size is greater than the position loop deadband. If
the step size is equal to or less than the position loop deadband, the steptrack
function will not operate correctly.
3. Verify that the signal level into the beacon receiver is within acceptable limits.
(The maximum RF levels for the VertexRSI TRC-14 and TRK-14 receivers are -
60 dBm).
4. Check each calibration of the beacon signal. The 0 dBm level should be set at
approximately 7.5 V to 8.5 V. Also note that calibration must be performed
separately for the A/D in use.
5. Check for proper mechanical/electrical connections of resolvers.
6. Check resolver alignment. (If the bellows coupling between resolver and pickoff
shaft appears visibly bent, the resolver is out of alignment.)
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