5-7
Maintenance
54-0182 Rev. A1
6. Installation of the replacement RF Detector is the
reverse of this procedure. Be sure that the RF
cables are restored to their original positions. Be
sure that the center conductor pin is centered in
the connector before tightening the collar.
5.4.3 Antenna LNB Replacement
Estimated Time to Repair:
1
⁄
2
hour
In the event that the LNB experiences problems, it may be
necessary to replace it. To do so, use the following procedure:
1. Make a note of the current LNB skew angle,
pictured in Figure 5-7
(European systems only).
2. Disconnect the RF cable connector at the LNB.
3. Remove the wing nut and washer from the LNB
clamp
– Fig. 5-3
.
4. Remove the top of the LNB clamp and remove the
LNB.
5. Place the new LNB in the clamp and reattach the
RF connector.
6. Replace the LNB clamp:
A. For North American LNBs, tighten the clamp
fully. The replacement process is complete.
B. For European LNBs, do not fully tighten the
clamp and proceed to step 7.
7. Carefully turn the LNB so that the scribe mark is
aligned with the skew angle noted in Step 1. Fully
tighten the clamp to complete the replacement
process.
The LNB receives power from the
IRD via the RF Detector PCB. Be
certain that the IRD is disconnected
from its power source before
removing or reconnecting the LNB.
Skew Angles
LNB Clamp
& Wing Nut
Scribe
Mark
LNB
Figure 5-7
LNB Skew Angle Setting
(European Systems Only)
