User Manual

Troubleshooting68P09255A57-2

Aug 2002

SC4812ET Optimization/ATP Manual Software Release R16.1.x.x

PRELIMINARY

6-15

Table 6-25: No DC Input Voltage to any C-CCP Shelf Module

Step Action

1 Inspect all Harting Cable connectors and back-plane connectors for damage in all the affected

board slots.

2 Perform steps outlined in the RF path troubleshooting flowchart in this manual.

RFDS

The RFDS is used to perform Pre-Calibration Verification and

Post-Calibration Audits which limit-check the RFDS-generate and

reported receive levels of every path from the RFDS through the

directional coupler coupled paths. In the event of test failure, refer to the

following tables.

All tests fail

Follow the procedure in Table 6-26 for problems with RFDS.

Table 6-26: RFDS Fault Isolation - All tests fail

Step Action

1 Check the calibration equipment for proper operation by manually setting the signal generator output

attenuator to the lowest output power setting and connecting the output port to the spectrum analyzer

rf input port.

2 Set the signal generator output attenuator to -90 dBm, and switch on the rf output. Verify that the

spectrum analyzer can receive the signal, indicate the correct signal strength, (accounting for the cable

insertion loss), and the approximate frequency.

3 Visually inspect RF cabling. Make sure each directional coupler forward and reflected port connects to

the RFDS antenna select unit on the RFDS.

4 Check the wiring against the site documentation wiring diagram or the BTS Site Installation manual.

5 Verify RGLI and TSU have been downloaded.

6 Check to see that all RFDS boards show green on the front panel indicators. Visually check (both

board and backplane) for damage.

7 Replace any boards that do not show green with known good boards one at a time in the following

order. Re-test after each is replaced.

- RFDS ASU board.

- RFDS Transceiver board.