4. Loosen the three stop nuts and gently press
downward on the motor hub until the drive belt
reaches the proper tension. Adjust the belt tension
for a maximum of
1
⁄8" (3 mm) deflection with
moderate finger pressure between the motor and
antenna pulley. Some readjustment may be
necessary if the belt tension results in excessive
antenna reflector vibration.
5. Tighten the three stop nuts.
Replacing the Elevation Drive Motor
1. Remove the Elevation Motor Molex connector
from the main PCB (see Figure 5-3). Feed the
elevation motor cable through the cutout to the
front of the support frame.
2. Remove the three stop nuts and washers that
secure the motor to the support frame (pictured in
Figure 5-9). Remove the motor assembly.
3. Install the new assembly with the elevation motor
cable facing down, as shown in Figure 5-9.
Reinstall the stop nuts and washers but do not
tighten.
4. Raise the motor and work the toothed drive belt
over the outer lip of the motor hub. Press down
gently on the motor body while rotating the
antenna reflector up and down to ensure free
movement.
5. Adjust the belt tension for a maximum of
1
⁄8" (3 mm) deflection with moderate finger
pressure between the hub and gear. Some
readjustment may be necessary if the belt tension
results in excessive antenna reflector vibration.
6. Reconnect the Elevation Motor Molex connector to
the main PCB.
Maintenance
54-0161
115
Excessive belt tension may result in
antenna reflector vibration.
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