User's Manual Part 3

Compact BTS Multi–Coupler Preselector Card – continued
MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 9-37
PRELIMINARY
Upon completion of the replacement procedure, have the OMC–R
operator verify that old alarms are cleared and that no new ones are
reported.
Replacement Procedure
This procedure requires working around circuitry that is
extremely sensitive to Electrostatic Discharge (ESD). Wear
a conductive, high impedance wrist strap during the
procedure.
Use appropriate safety measures.
CAUTION
Before Beginning
If desired, record the BTS and cMPC serial number of the failed unit in
Table 9-62 at the end of this chapter.
Remove cMPC
Follow the procedure in Table 9-21 to remove the cMPC.
Table 9-21: Procedure to Remove cMPC
Step Action
1 Notify operator that the cMPC replacement procedure is starting and that alarms can be expected.
2 Put on an ESD wrist strap or other approved grounding device.
3 If not already done, remove BTS front panel cover by grasping finger grooves at the top and bottom
and pulling simultaneously.
4 Simultaneously press the locking tabs on both the top and bottom card latches
Pull the latches out to disengage the card from the shelf and slide the card out far enough to disconnect
the RF cabling.
* IMPORTANT
If the BTS is set up for 2 PAs, then there will be 6 RF cables (fitted with QMA connectors) to
disconnect.
Recommend that the cables be disconnected either from top–to–bottom or bottom–to–top. This will
be important when re–connecting the cables.
At the rear of the card the jumper will be connected to the upper of the two RF connections
5 Cables are labeled and color coded, if not, then tag each cable as it is disconnected.
Once cables are disconnected, pull out card.
6 Place in/on an anti–static container or surface.
Install cMPC
Follow the procedure in Table 9-22 to install the cMPC.
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