5-7
Maintenance
54-0159 Rev.G
5. Remove the 4 standoffs – Fig. 5-1. Remove the RF
Detector PCB from the rotating plate.
6. Installation of the replacement RF Detector is the
reverse of this procedure. Be sure that the RF
cables are restored to their original positions. Be
sure that the center conductor pin is centered in
the connector before tightening the collar.
5.4.3 Antenna Gyro Assembly

Estimated Time to Repair: 1 hour

The antenna gyro is mounted on the rear of the antenna reflector
bracket with four locking nuts and washers – Fig. 5-3. Following
the removal and replacement of the antenna gyro assembly, it
will be necessary to calibrate the gyro and restart the system.
Directions for removal, replacement, and calibration follow:
1. Using needle-nose pliers, remove the E-ring from
one end of the connecting rod – Fig. 5-2.
2. Remove the connecting rod by sliding it off the
bracket.
3. Fully retract the elevation axis motor shaft
–Fig. 5-5.
4. Remove the 6 pan head screws from the PCB cover
flanges.
5. Remove the PCB cover. To get the necessary
clearance, rotate the linear actuator up 90º while
lifting the PCB cover –Fig. 5-5.
6. Remove the screw and clamp holding the antenna
gyro cable to the rotating plate. Be sure to save the
cable clamp and screw – Fig. 5-4.
7. Remove the Molex connector from J11 on the PCB
– Fig. 5-6.
8. Remove the 4 nuts and washers and take the gyro
off of the bracket.
9. Remove the antenna gyro gasket.
10. Replacement is the reverse of this procedure.
Following the removal and
replacement of the antenna gyro
assembly, it will be necessary to
calibrate the gyro and restart
the system as described in the next
section.