Appendix A: RF Troubleshooting
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A-15
2.5 WCDMA power detector biasing self test (ST_CDSP_PWR_DETECTOR_BIAS_TEST)
POWER_DETECTOR_BIAS_TEST (82) tests the biasing of the power detector.
If this fails, also the power tests will fail/can’t be trusted.
Test covers: Vinku (N7501) WCDMA power detector biasing circuit functionality, Retu (N2200) WTXDET
input. RFBUS, VBAT_ASIC
Error code for this self test is given in format:
•
0xyy, 0xzz, MeasResult1, MeasResult2
,where 0xyy, 0xzz part is the main part of the error code:
0xyyzz
Please, refer to chapter
Error Code Interpretation Examples
if more information about error code
interpretation is needed.
Test error (0x0001,
0x0002, 0x0008,
0x0010)
ST_CDSP_WCDMA_POWER_DET
EC TOR_BIAS_TEST ERRORS
Propable cause:
?
Other possible reasons:
RFBUS, but shouldn’t be
since we’ve gotten this
far.
YES
NO
Detector reading outside
limits (0x0004)
YES
Propable cause:
Pr
e
oblem in detector circuitry
s e “
WCDMA power detector
ok?
” for debugging details.
Other possible reasons:
Poor solder/faulty Retu
It’s not possible to
get here…
NO
2.5.1 WCDMA power detector ok?
Follow these instructions if it’s needed to check WCDMA power detector functionality. Please notice
that WCDMA power detector is used only in maximum TX power limiting and WCDMA PA supply
voltage controlling purposes.
•
WCDMA transmitter has to be active before measurements. Procedure is explained in chapter
“Transmitter troubleshooting”.
