User's Manual

Pre–Power–up Tests – continued
SC 4812T CDMA BTS Optimization/ATP
May 2000
2-6
Table 2-2: DC Power Pre–test (BTS Frame)
Step Action
7 Set the LPA breakers ON by pushing them IN one at a time. Repeat Step 3 after turning on each
breaker.
 A typical response is that the ohmmeter will steadily climb in resistance as capacitors charge,
stopping at approximately 500
Ω..
8 In the –48 V BTS, insert and lock the DC/DC LPA converter modules into their associated slots one at
a time. Repeat Step 3 after inserting each module.
 A typical response is that the ohmmeter steadily climbs in resistance as capacitors charge, finally
indicating approximately 500 Ω
indicating
approximately
500
Ω
.
! CAUTION
Verify the correct power/converter modules by observing the locking/retracting tabs appear as follows:
–
(in –48 V BTS power conversion shelf)
STPN4044A
PWR CONV LPA
9 Seat all LPA and associated LPA fan modules into their associated slots in the shelves one at a time.
Repeat Step 3 after seating each LPA and associated LPA fan module.
 A typical response is that the ohmmeter will steadily climb in resistance as capacitors charge,
stopping at approximately 500
Ω..
2