User's Manual

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Initial Power-up

68P09255A69-3

Aug 2002

1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x

PRELIMINARY

2-8

Figure 2-6: DC PDA

SC4812ETL0009-3

LPA

1B 1D 3B 3D

1A 1C 3A 3C PS1 PS2

ETIB

OPTIONS

25 25

HEAT EXCHANGER

CAUTION

SHUT OFF BOTH BREAKERS

ONLY DURING HEAT EXCHANGER

MAINTENANCE OR REPAIR

LPA

BLOWERS

PUSH BUTTON

TO RESET

LPA BLOWERS

MAIN BREAKER

300

50 5010 1530 30 30 30 15

PILOT

BEACON

DC Power System Pre-power Application Test

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

Table 2-3 to verify there are no shorts in the DC power distribution

system.

NOTE

The procedure in Table 2-3 is required only on initial frame

power-up or following maintenance when any major power

components (e.g., ACLC, DC PDA, Meter Alarm Panel) were

replaced or internal DC power cables were disconnected.

Table 2-3: DC Power System Pre-Power Application Test

Step Action

1 Physically verify all ACLC front-panel circuit breakers (Figure 2-4) are OFF (down), all DC PDA

circuit breakers (Figure 2-6) are set to OFF (pulled out), and all battery shelf circuit breakers

(Figure 2-3) are OFF (pulled out).

2 Visually ensure that all AC rectifier modules (Figure 2-3) are not powered (DC, PWR, and bar graph

LEDs are not lighted), that the MAP power switch (Figure 2-9) is OFF, and that no LEDs on the

MAP are lighted.

3 Inside the battery compartment, measure the voltage between the + (red) and - (black) battery bus

bars. There should be no 27 Vdc present.

NOTE

Do not unseat the AC rectifier modules in the following step.

Perform the following:

4a - In the frame RF compartment, unseat all circuit boards/ modules (except CCD and CIO cards) in

the SCCP shelf, but leave them in their respective slots.

4b - In the frame LPA compartment, disconnect the Linear Power Amplifier (LPA) cables from the

compartment bulkhead feed-through connector.

5 Set the DMM to measure resistance, and inside the battery compartment, measure the resistance

between the + (red) and - (black) battery bus bars. The resistance should measure >

1 ΜΩ.

6 Leave the DMM set to measure resistance, and insert the probes into the MAP VOLT and AMP TEST

POINTS (Figure 2-9). Place the (+) DMM probe into the (-) AMP TEST POINT. Place the (-) DMM

probe into the (-) VOLT TEST POINT. Resistance should measure greater than 750 Ω.

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