User's Manual Part 2

Pre–Power Up Test (Indoor) – continued
MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 5-5
PRELIMINARY
Table 5-5: BTS DC Pre–Power Test
Step Action
3 At the rear of the BTS, verify that 20 or 25 A circuit breaker is OFF (pulled out). See Figure 5-3 or
Figure 1-9.
4 Use a DMM (set to ohms) and verify the resistance on the –48V or +27V bus.
– Remove the Power Supply Module from the CCP2 Shelf
– Verify that the resistance from the power (+) feed terminal with respect to ground measures > 500
W
See Figure 5-3 for –48VDC or Figure 1-9 for +27VDC
– Verify that the resistance from the power (–) feed terminal with respect to ground measures > 500
W
See Figure 5-3 for –48VDC or Figure 1-9 for +27VDC
The resistance measurement should not read 0 (zero).
5 Re–seat all circuit boards into their slots
6 Install the Power Supply Module into its slot.
7 Install front panel cover.
GROUND Location
(Screw Holes)
DC Power
Terminal Strip
Circuit Breaker
Figure 5-3: Location of Circuit Breaker for –48 VDC
20A
cCLPA DC Power Pre–Test
Perform the procedure Table 5-6 in before applying any power to the
cCLPA.
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