User Manual

Troubleshooting: Calibration

6-6 1X SC4812T–MC BTS Optimization/ATP 5/21/04

DRAFT

Bay Level Offset Calibration

Failure

Perform the procedure in Table 6-8 to troubleshoot a BLO calibration

failure.

Only one carrier can be tested at a time. All PAs must be

INS during testing. For the carriers not under test, key one

BBX per carrier to a minimum power level. (Refer to

Table 3-37).

NOTE

Table 6-8: Troubleshooting BLO Calibration Failure

n Step Action

1 Verify the Power Meter is configured correctly (see the test equipment setup section in Chapter 3)

and connection is made to the proper TX port.

2 Verify the parameters in the bts–#.cdf file are set correctly for 800MHz:

Bandclass=0; Freq_Band=8; SSType=8

3 Verify that no PA is in alarm state (flashing red LED).

Reset the PA by pulling the circuit breaker and, after 5 seconds, pushing back in.

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

head.

5 Verify the GPIB adapter is not locked up.

Under normal conditions, only two green LEDs must be ‘ON’ (Power and Ready).

If any other LED is continuously ‘ON’, power-cycle (turn power off and on) the GPIB Box and

retry.

6 Verify the sensor head is functioning properly by checking it with the 1 mW (0 dBm) Power Ref

signal.

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

“RES”.

Cannot Load BLO

For Load BLO failures see Table 6-7.