User's Manual Part 3

Compact BTS Input and Output Board – continued
9-46 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU MAY 2004
PRELIMINARY
ISO LED
The ISO LED indicates the status of the isolated DC voltage that is used
for the customer inputs. This LED should always be ON, if the +5V
supply to the CBIO Board is okay. If the LED is OFF, it indicates a
problem on the CBIO Board.
Required Items
Documents
None
Tools
Screwdriver with T20 star bit
Replacement Items
One CBIO Board.
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 CBIO 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 CBIO Board serial number of the failed
unit in Table 9-64 at the end of this chapter.
Remove CBIO Board
Follow the procedure in Table 9-26 to remove the CBIO Board.
To perform the following procedure, the BTS must be
removed from the Mounting Plate.
NOTE
Table 9-26: Procedure to Remove CBIO Board
Step Action
1 Notify operator that the CBIO Board replacement procedure is starting and that alarms can be
expected.
2 Perform the Site Shutdown procedure in Table 10-2.
table continued on next page
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