User's Manual

Pre–Power Up Test (Indoor) – continued
5-6 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU Jun 2004
DRAFT
Table 5-6: cCLPA DC Pre–Power Test
Step Action
1 Ensure that DC power is disengaged at the source. Verify that the DC power cable has been connected
using the procedure in Table 4-8.
2 Remove I/O panel cover.
3 At the bottom of the cCLPA, verify that 25 A circuit breaker to OFF (pulled out). See Figure 5-4.
4 Us a DMM (set to ohms) and verify the resistance on the +27 V bus.
– Verify that the resistance from the power (+) feed terminal with respect to ground measures > 500
W
– Verify that the resistance from the power (–) feed terminal with respect to ground measures > 500
W
The resistance measurement should not read 0 (zero).
5 Proceed to Initial Power up procedure in Table 5-11.
ti–cdma–wp–00298–v01–ildoc–ah
Figure 5-4: Bottom View of cCLPA
25A FUSE
for +27 V
5