User's Manual

Table Of Contents
Troubleshooting: Calibration – continued
FEB 2005 1X SC 4812T Lite BTS Optimization/ATP 6-13
PRELIMINARY
Calibration Audit Failure
Table 6-13: Calibration Audit Failure Troubleshooting Procedure
n Step Action
1 Verify that the Power Meter or Communications System Analyzer is configured correctly.
Refer to the Test Equipment Set–up section of Chapter 3), and is connected to the proper BTS
TX Antenna Connector.
2 If a Power Meter is being used, perform the following actions.
2a Re-calibrate the Power Meter and verify it is calibrated correctly with Cal Factors from the Power
Sensor.
Refer to Appendix F.
2b Verify that the Power Sensor is functioning properly by checking it with the 1–mW (0 dBm)
Power Ref Signal.
2c Verify communication between the LMF and Power Meter is working by checking that the Meter
Display is showing RES :.
3 Verify that no LPAs on the carrier are in Alarm State (rapidly flashing red LED).
If any LPAs are in Alarm State, proceed to Step 4.
4 Reset the LPA(s) by performing the following actions.
4a Pull the applicable circuit breaker on the DC PDA, and,
4b After 5 seconds, push the circuit breaker back in.
5 After Calibration, the BLO Data must be re-loaded to the BBX Cards before auditing.
Click on the BBX(s), and in the BTS Menu Bar select Device > Download >BLO.
Re-try the audit.
6 Verify that the GPIB Adapter is not locked up.
Under normal conditions, only two green LEDs are ‘ON’ (Power and Ready).
If any other LED is continuously ‘ON’, proceed to Step 7.
7 Power Cycle (turn power off and on) the GPIB Box and re–try.
8 If Calibration is being performed for the Redundant BBX, ensure that the Single–Sided BLO
Check Box is not checked in the CDMA Test Parameters Test Set–up Window.
9 If additional items, such as Directional Couplers or Combiners, have been installed in the TX
Path, make sure that one of the following has been done:
S Verify BLO Check Box in the CDMA Test Parameters Test Set–up window is unchecked.
S The additional Path Losses have been added into each applicable sector using the Util > Edit >
TX Coupler Loss... Function.
6