SeaSpace TeraScan 1.5M Operation And Maintenance Manual page 111

7.2.4.2 Tracking Positioner (cont.)
CONDITION
Azimuth reference
error
Azimuth torque error. ac 1 st
Elevation torque error
and see 7.2.4.3 -
Elevation Torque Test.
Cross-level torque
error.
Antenna does not
move in response to
an ELEVATION
drive command.
TEST
ac 1 st
ac 1 st
ac 1 st
ac 1 el 90.0
ac 1 pos
ac 1 el 0.0
ac 0 pos
CAUSE
Antenna type in PCU is
incorrect.
Cable is caught.
Gain is too high.
Cable is caught.
Gain is too high.
Antenna is out of balance
(front to back).
Cable is caught.
Gain is too high.
Antenna out of balance
(left to right).
A pin is pushed in on the
pedestal harness at PCU
connector.
PCU is faulty.
Bad elevation motor.
Bad servo amplifier.
Bad harness,
PCU to servo.
Level platform stepper
motor belt is too tight.
Level platform assembly
does not rotate freely on
cross-level beam.
Bad harness.
TeraScan 1.5m Polar Satellite Tracking Antenna O & M Manual 95
ACTION
Enter antenna type n0xxx, {8.5.1}
See Table 8-1, page 142.
Re-dress cables.
Check torque settings, Table 8-1.
Re-dress cables.
Check torque settings, Table 8-1.
Rebalance antenna {8.5.1}.
Re-dress cables.
Check torque settings, Table 8-1.
Rebalance antenna {8.5.1}.
Pull the pin back out, realign it,
and reset the connector.
Replace PCU {8.4.1}.
Replace elevation motor {8.4.2}.
Replace servo amplifier {8.4.3}.
Replace pedestal harness.
Adjust belt {8.4.34, Step 5}.
Loosen nut (drawing 70918004,
page 53) on level platform
assembly.
Replace pedestal harness.
Replace motor harness
(6003AL only).