User's Manual Part 3

TME Power Distribution Assembly – continued
MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 9-71
PRELIMINARY
Figure 9-26: PDA Location
ti–cdma–wp–00262–v03–ildoc–ah
–48VDC PDA
Replacement Procedure
If desired, record the BTS and PDA serial number of the failed unit in
Table 9-68 at the end of this chapter.
Remove PDA
Follow the procedure in Table 9-41 to remove the PDA. See Figure 9-26
or Figure 9-28.
Table 9-41: Procedure to Remove PDA
Step Action
1 Notify operator that the PDA replacement procedure is starting and that alarms can be expected.
2 Disengage circuit breakers by pulling or setting to “O” position.
3 Turn off DC power to the PDA.
4 On –48VDC PDA, remove protective cap from DC Power connector. Proceed to step 5.
On +27VDC PDA disconnect power plug from connector. Proceed to step 6.
5 Use a screwdriver to loosen screws securing DC power wires to PDA.
6 Use a wrench to remove two nuts and washers securing ground lug to the PDA.
7 Loosen captive screws securing PDA to TME chassis.
table continued on next page
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