User Manual

Troubleshooting

68P09255A57-2

Aug 2002

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

PRELIMINARY

6-6

Table 6-8: Troubleshooting BLO Calibration Failure

 ActionStep

7 If communication between the LMF and Power Meter is operational, the Meter display will

show “RES :’’

8 Verify the combiner frequency is the same as the test freq/chan.

Calibration Audit Failure

Follow the procedure in Table 6-9 to troubleshoot a calibration audit

failure.

Table 6-9: Troubleshooting Calibration Audit Failure

 Step Action

1 Verify Power Meter is configured correctly (refer to the test equipment setup section of chapter

3).

2 Re-calibrate the Power Meter and verify it is calibrated correctly with cal factors from sensor

head.

3 Verify that no LPA is in alarm state (rapidly flashing red LED). Reset the LPA by pulling the

circuit breaker, and, after 5 seconds, pushing back in.

4 Verify that no sensor head is functioning properly by checking it with the 1 mW (0 dBm) Power

Ref signal.

5 After calibration, the BLO data must be re-loaded to the BBX2s before auditing. Click on the

BBX(s) and select Device>Download BLO

Re-try the audit.

6 Verify GPIB adapter is not locked up. Under normal conditions, only 2 green LEDs must be

‘ON’ (Power and Ready). If any other LED is continuously ‘ON’, power-cycle (turn power off

and on) the GP-IB Box and retry.

Forward link problem

If the BTS passes the reduced ATP tests but has a forward link problem

during normal operation follow the procedure in Table 6-10 to

troubleshoot.

Table 6-10: Troubleshooting Forward Link Failure (BTS Passed Reduced ATP)

 Step Action

1 Perform these additional TX tests to troubleshoot a forward link problem:

- TX mask

- TX rho

- TX code domain