User Manual

Pre–Power Up Tests

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

DRAFT

Objective

This procedure checks for any electrical short circuits and verifies the

operation and tolerances of the cellsite and BTS power supply units prior

to applying power for the first time.

Test Equipment

The following test equipment is required to complete the pre–power–up

tests:

S Digital Multimeter (DMM)

Always wear a conductive, high impedance wrist strap

while handling the any circuit card/module to prevent

damage by ESD.

CAUTION

Cabling Inspection

Using the site-specific documentation generated by Motorola Systems

Engineering, verify that the following cable systems are properly

connected:

S Receive RF cabling – up to 12 RX cables

S Transmit RF cabling – up to six TX cables

S GPS

DC Power Pre-test (BTS Frame)

Before applying any power to the BTS frame, follow the procedure in

Table 2-2 while referring to Figure 2-3 to verify there are no shorts in the

BTS frame DC distribution system.

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

Step Action

1 Physically verify that all DC power sources supplying power to the frame are OFF or disabled.

2 On each frame:

S Unseat all circuit boards (except CCD and CIO cards) in the C–CCP shelf and LPA shelves, but

leave them in their associated slots.

S Set C–CCP shelf breakers to the OFF position by pulling out power distribution breakers (labeled

C–CCP 1, 2, 3) located on the power distribution panel.

S Set LPA breakers to the OFF position by pulling out the LPA breakers (8 breakers, labeled 1A–1B

through 4C–4D) located on the power distribution panel.

Continue with Step 3 for –48 V or Step 4 for +27 V.

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