User Manual

Pre–Power Up Tests – continued

5/21/04 1X SC4812T–MC BTS Optimization/ATP 2-3

DRAFT

Table 2-2: DC Power Pre–test (BTS Frame)

Step Action

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..