6. Connect the new antenna gyro’s Molex connector
to the main PCB.
7. Replace the antenna gyro gasket (see Figure 5-6).
8. Using the standoffs removed in Step 3, secure the
new antenna gyro to the bracket. The antenna gyro
should be oriented so that the cable extends from
the top of the gyro, as shown in Figure 5-6.
9. Using a tie-wrap, secure the antenna gyro cable to
the bottom right standoff.
10. Reattach the counterweight, screws, and washers
removed in Step 2.
11. Redress the gyro and RF cables using 3 tie-wraps.
12. 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.
13. Reinstall the PCB cover.
Calibrating the Antenna Gyro
1. With a PC connected to the ADCU’s maintenance
port, apply power to the antenna unit.
2. Type
HALT<cr> (<cr> indicates a carriage
return/ENTER key) 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.
3. Type
DEBUGON<cr> to enter the Debug Mode.
4. Type =LSTEST<cr>.
5. Type =EL,300<cr>.
6. Type
=CALGYRO<cr>. Verify that the Antenna
Gyro Azimuth scale factor is between -0.00090 and
-0.00110 and the Antenna Gyro Elevation scale
factor is between 0.00090 and 0.00110.
7. Type
ZAP<cr> to restart/reinitialize the system.
Maintenance
54-0161
113
Refer to
Section 4.6, “Computer
Diagnostics” on page 100
for
complete details on connecting a
PC to the system via the
maintenance port.
To Next Page
Loading...
Need help?
General
