Pre–Power–up Tests
68P64115A21–B
Sept 2003
1X SC 4812T-MC Multicarrier BTS Optimization/ATP
2-7
Table 2-2:
DC Power Pre–test (BTS Frame)
Step
Action
6
Insert and lock the DC/DC converter modules for the C–CCP shelf and into their associated slots
one
at a time
. Repeat Step 3 (for –48 V) or Step 4 (for +27 V) after inserting each module.
– A typical response is that the ohmmeter steadily climbs in resistance as capacitors charge, finally
indicating approximately
500
Ω
.
! CAUTION
Verify the correct power/converter modules by observing the locking/retracting tabs appear as follows:
STPN4009B
PWR C–CCP 4812 +27V
7
Insert and lock all remaining circuit boards and modules into their associated slots in the C–CCP shelf.
Repeat Step 3 (for –48 V) or Step 4 (for +27 V) after inserting and locking each board or module.
– A typical response is that the ohmmeter steadily climbs in resistance as capacitors charge,
stopping at approximately
500
Ω
..
8
Set the
LPA
breakers
ON
by pushing them in. Repeat Step 3 (for –48 V) or Step 4 (for +27 V) 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
..
NOTE
Engage circuit breakers only for LPAs that are equipped.
9
In the –48V BTS, insert PSMs one at a time in their associated slots, verifying that LED is green.
Repeat Step 3 after inserting each module.
10
Seat all LPA and associated LPA fan modules into their associated slots in the shelves
one at a time
.
Repeat Step 3 (for –48 V) or Step 4 (for +27 V) after seating each LPA and associated LPA fan
module.
S
A typical response is that the ohmmeter will steadily climb in resistance as capacitors charge,
stopping at approximately
500
Ω
..
2
