5.8 Replacing the LNB
The LNB assembly receives power from the IRD via the RF PCB.
Be certain that the IRD is turned off or disconnected from its
power source before removing or reconnecting the LNB.
Replacing a North American or Latin American LNB
1. Using a
7
⁄16" wrench, carefully disconnect both RF
connectors from the LNB.
2. Loosen the two wing screws on the throat of the
choke feed until the LNB is free to slide out.
Withdraw the LNB as shown in Figure 5-10.
3. Insert the replacement LNB as far as it will go,
ensuring it reaches the bottom of 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.
4. Apply a small amount of thread-locking
compound (Loctite 425 or equivalent) to the wing
screw threads and tighten the screws to secure the
LNB in position.
5. Reattach the RF connectors to the LNB.
Maintenance
54-0161
119
Figure 5-10
North American or Latin American
LNB Replacement
Ensure that the IRD is turned off or
disconnected from its power source
before removing or reconnecting
the LNB.
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