3. Use the
3
⁄
8
" nut driver/socket to remove the four
standoffs securing the Antenna Gyro to the
bracket. The standoff on the bottom right also
secures a tie-wrap.
4. Remove 3 tie-wraps holding gyro and RF cables.
5. Disconnect the 7-pin Molex connector from the
PCB. Place the old Antenna Gyro assembly aside.
6. Attach the 7-pin Molex to the new Antenna Gyro
assembly.
7. Replace the Antenna Gyro gasket.
8. Use the standoffs removed in Step 3 to attach the
new Antenna Gyro to the bracket. The bottom
right standoff should be used to secure the
tie-wrap on the Antenna Gyro Cable. The Antenna
Gyro should be oriented so that the cable extends
from the top of the gyro.
9. Reattach the counterweight and screws removed
in Step 2.
10. Redress gyro and RF cables using 3 tie-wraps.
11. Carefully move the reflector through its range of
motion to ensure that the cable moves freely
between the elevation mechanism and the lower
assembly. Adjust the Antenna Gyro cable as
necessary to ensure proper motion.
Antenna Gyro Calibration
1. With the PC connected to the maintenance port,
apply power to the antenna unit.
2. Type
HALT<cr
> while the system is performing
the limit switch initialization routine. The system
will complete the initialization function by finding
the azimuth and elevation switch limits and then
go to the home position. Record the 8-digital serial
number that was displayed in the startup message.
3. Type
DEBUGON<cr>
to enter Debug Mode.
4. Type
ZAP<cr>
.
5. Type
HALT<cr>
while the system is performing
the limit switch initialization routine. The system
will complete the initialization function by finding
the azimuth and elevation switch limits and then
go to the home position.
4-7
Maintenance
54-0166 Rev. B
Make sure the cable jacket passes
through the PCB access slot to
protect the wires from the edge of
the PCB frame.
