Replacing the RF PCB
1. The RF PCB receives operating voltages from both
the main PCB and the IRD (via the RF cable).
Ensure that all power (including the IRD) is
turned off before proceeding.
2. Remove the PCB cover, as explained in “Removing
the PCB Cover” on page 108.
3. Disconnect the two Molex connectors from the RF
PCB (see Figure 5-3 on page 109).
4. If one of the RF cables is not already marked, label
one so that the RF cables can later be plugged into
the proper positions on the new RF PCB.
5. Using a
7
⁄16" wrench, carefully remove the two RF
cables from the RF PCB. Hold the RF connector
ferrules while loosening the connectors to avoid
excess stress on or twisting of the cables (see
Figure 5-5).
6. Remove the four #6-32 screws that secure the PCB
to the antenna frame (see Figure 5-4 on page 109).
7. Remove the old RF PCB.
8. Install the new RF PCB, making certain to align
the PCB so that the RF connectors are facing
down, as shown in Figure 5-3 on page 109.
9. Secure the RF PCB to the support frame using the
screws removed in Step 6.
10. Reattach the RF cables, making certain to connect
them in their original positions.
11. Reattach the Molex connectors to the RF PCB.
12. Reinstall the PCB cover.
Replacing a Fuse
Two 5x20 mm, 3.15-amp, 250-volt fast-blow fuses are mounted to
the main PCB (see Figure 5-3 on page 109). If one of these fuses
has blown or been broken, simply remove the bad fuse and
replace with a good fuse of the same rating.
Maintenance
54-0161
111
Failure to hold the ferrules tightly
while loosening the RF connectors
can result in damage to the cables
and reduce the signal quality.
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