User Guide

PAMS
Technical Documentation
WinTesla User Guide
NHD–4
Page 60
Original 11/97
4. Adjust the TXI_REF PDM until the CDMA TX output bandpower is
approximately 24.5 dBm. If this can be accomplished, the TX Gain
Limiting functionality has been verified.
Troubleshooting
A failure of this test might result from a faulty transmitter, or problems
within the CDMA TX gain control circuitry. The operation of the CDCONT
should be checked, as should the TXI_REF PDM, and the TXI voltage. If
the transmitter has lost any gain, this test will most likely fail.
Aux. AGC Tuning Functionality Test
Manual Test
Auxiliary AGC functionality can be verified by performing the Aux. AGC
tuning from the Service Software. Another method would be to perform
the manual verification steps described below.
1. Maximize the CDMA TX output bandpower by initiating the CDMA
Troubleshooting Mode.
2. From the PDM controls, adjust the AGC_REF PDM to 0. This sets the
AT–109 to minimum attenuation.
3. Next adjust the TX_OFFSET PDM until the CDMA TX output
bandpower is approximately 16 dBm. This verifies the BPOW1 step
4. Adjust the AGC_REF PDM to provide the 5 dB of attenuation, bring the
output bandpower to approximately 11.0 dBm. This verifies the next step
BPOW1 – BPOW2.
5. Adjust the AGC_REF PDM to provide an additional 10 dB of
attenuation, bring the output bandpower to approximately 1.0 dBm. If the
additional 10 dB of attenuation is achieved, the third step BPOW2 –
BPOW3 is verified. The final 1.0 dBm bandpower is BPOW3.
Troubleshooting
For this step to occur the CDMA transmitter must be functioning, at least
enough to achieve 16 dBm of output. The TX_OFFSET and AGC_REF
PDMs must work, as well as the AT–109 attenuator. Consult the Service
Manual
Transmitter Troubleshooting section and Functional Description
for further information and tests.