PTP 800 Series User Guide Replacing IRFU components
phn-2513_004v000 (Oct 2012)
5-101
3
Remove the cable between the Tx filter to the RF switch.
4
Unfasten the six Captive screws attaching the Tx Filter and the Rx Filter to the
bottom of the shelf. Refer to Figure 112 for locating the screws.
5
Remove the BU Assembly (filters and Circulator Assembly) from the shelf.
Install the new branching unit
To install the new branching unit, proceed as follows:
1
Assemble the BU. Reuse disassembled components only if they are sound. Use
new components bearing the same specifications as the original ones.
2
Position the replacement BU Assembly in its designated location, ensuring to align
properly all screws on the filters with their corresponding holes on the bottom of
the shelf.
3
Re-fasten the 6 Captive screws unfastened earlier, to secure the BU Assembly to
the bottom of the shelf. DO NOT overtighten.
Reinstall the transceiver
To reinstall the transceiver after replacing the branching unit, proceed as follows:
1
Reconnect the RF switch ribbon cable to the bottom of the transceiver, slide the
transceiver in the shelf, then fasten its Captive screws (2) to secure it in place.
2
Using a 5/16 inch SMA torque wrench w/right-angle adaptor or a Standard torque
wrench set to 0.1 kg•m (9.0 lb-inch), reconnect the RF cables to the transceiver,
referring to the applicable configuration. For guidance, follow procedure Install
the new RF cable on page 5-105.
3
Re-place the IRFU section cover plate by fastening both its Captive thumbscrews.
4
Connect both the Power cable and Coaxial cable to their respective connectors on
the IRFU.
5
Push the PWR button ON.
Once the radio link is re-established, verify that there are no alarms.
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