User guide

Replacing IRFU components Chapter 5: Installation
5-102
phn-2513_004v000 (Oct 2012)
Replacing filters
When replacing filters, refer to Figure 113.
This step is only required when changing frequencies, without changing bands. However,
to facilitate the removal of filters, perform Remove the branching unit on page 5-100.
This procedure will interrupt traffic, whether the system is protected or non-protected.
Figure 113 Filter replacement
Remove the filters
1
Perform Remove the branching unit on page 5-100.
2
Deposit the BU (Circulator an filters assembly) on a flat surface.
3
Unfasten all required socket-head screws, and keep them for reuse.