User's Manual Part 3

Compact Combined Linear Power Amplifier
MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 9-67
PRELIMINARY
Introduction
The procedures in this section cover only the removal and installation of
the Compact Combined Linear Power Amplifier (cCLPA).
System Impact/Considerations
If the cCLPA is failing or has failed there will be an interruption in call
processing. While the BTS itself may be operational, there may not be
reception or transmission depending on the fault.
Required Items
Documents
None
Tools
Screwdriver with T20 star bit
Replacement Item
S –48 VDC A Band (STTF4023)
S +27 VDC A Band (STTF4024)
S +27 VDC B Band (STTF4025)
Prerequisite
Coordinate this repair task with the OMC–R operator.
IMPORTANT
*
Contact the OMC–R operator before performing the replacement
procedure. Tell the operator that the Filter Tray will be replaced and that
alarms can be expected.
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
If desired, record the BTS and cCLPA serial number of the failed unit in
Table 9-67 at the end of this chapter.
Remove cCLPA
Follow the procedure in Table 9-39 to remove the cCLPA.
Table 9-39: Procedure to Remove cCLPA
Step Action
1 Notify operator that the cCLPA replacement procedure is starting and that alarms can be expected.
2 Have OMC–R operator disable the cCLPA and the associated BBX card(s).
table continued on next page
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