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4. Install the new motor with the open holes in the
motor mounting plate behind the slots in the
frame and the motor connector facing down, as
shown in Figure 5-5. Reinstall the machine screws
and washers but do not tighten.
5. Raise the motor and work the toothed drive belt
over the outer lip of the hub. Press down gently on
the motor body while rotating the antenna
reflector up and down to ensure free movement.
6. 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.
7. Reconnect the Elevation Motor Molex connector to
the PCB.
5.7 Antenna LNB Replacement
The LNB assembly receives preamplifier operating power from
the IRD via the RF Detector PCB. Be certain that the IRD is
turned off or disconnected from its power source before
removing or reconnecting the LNB.
1. Disconnect both RF coaxial connectors at the LNB.
Loosen (2) allen set screws on the throat of the
choke feed until the LNB is free to slide out.
Withdraw the LNB.
2. Insert the replacement LNB as far as it will go. Be
sure that it bottoms in the feedhorn. Be careful not
to puncture or dislodge the plastic seal covering
the LNB throat. Orient the LNB to align with the
strut holding the pair of RF cables.
3. Apply a small amount of thread-locking
compound (Loctite 425 or equivalent) to the allen
screw threads and tighten the screws to secure the
LNB in position.
5-10
A Guide to TracVision 4
The short screw must go in the
upper left hole on the motor flange
(as viewed from the motor housing
end with the cable extending
down). Refer to Figure 5-8 for
proper screw location.
Excessive belt tension may result in
antenna reflector vibration.
Figure 5-9
LNB Removal and Alignment