TM 11-5840-281-12-1
4-47.
PERFORMANCE TESTS. (CONT)
PRECISION SCAN MODE CHECK
TEST CONDITIONS: Radar set turned on, Preliminary Control Settings (para 2-4).
1. On local control monitor, place LOCAUREMOTE switch to RT position and SCAN MODE switch to
350position.
WARNING
Be extremely careful when performing steps 2 through 6 to avoid being
struck by scanning antennas.
2. Place SCAN switch on local control monitor to ON position.
3. Observe that scan sequence is as follows: azimuth antenna counterclockwise, elevation antenna up; azimuth
antenna clockwise, elevation antenna down. If scan sequence Is not as indicated, 35 elevation synchro B5303 is
incorrectly nulled; refer to higher category of maintenance.
4. Verify that azimuth antenna scans sector of approximately 30 degrees, centered around O-degree mark on azimuth
scan protractor, and is not displaced 180 degrees. If scan sector Is displaced 180 degrees, azimuth synchro B1001 is
incorrectly nulled, refer to higher category of maintenance.
5. On local control monitor, place SCAN MODE switch to 60 position and observe that antenna scan sequence is as
indicated in step 3. If scan sequence is not as indicated, elevation synchro B503 is incorrectly nulled, refer to higher
category of maintenance.
6. Observe azimuth scan protractor and ensure azimuth antenna scans an equal distance to each side of + 15 degree
indication. If scan is not as indicated, azimuth synchro B1001 requires adjustment, refer to higher category of
maintenance.
ELEVATION DRIVE MOTOR CHECK
TEST EQUIPMENT: Stopwatch or wristwatch capable of measuring seconds
TEST CONDITIONS: Radar set turned on, Preliminary Control Settings (para 2-4).
1. On local control monitor, place LOCAUREMOTE switch to RT position and SCAN MODE switch to NORM position.
WARNING
Be extremely careful when performing steps 2 through 4 to avoid being struck by scanning antennas.
2. Place SCAN switch on local control monitor to ON position and observe that azimuth antenna is scanning and
elevation antenna is still.
NOTE
In the following steps, rotation is viewed from elevation antenna side of receiver-transmitter.
If any indications observed in step 3 are not as listed, refer to a higher category of maintenance.
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