Nokia RM-42 Service Manual page 284

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Measurement can be done with an oscilloscope and a probe.

Connect the probe to R7531.

WTXDET signal should be constant DC-voltage. Voltage level should change if TX power is changed.

Vcontrol is lower on lower power levels and higher if higher power levels are used.

WTXDET should be about 325 mV with power level +10 dBm, about 1.03 V with power level

+21 dBm and about 150 mV when power levels below 0 dBm are used.

NOTICE: Perform WCDMA transmitter tests with > 0 dBm power only in RF shielded environment.

If WTXDET –signal is not as expected follow the same troubleshooting instructions as in:

SMPS get correct control voltage from the WCDMA power detector (signal Vcontrol)?

Company Confidential

Appendix A: RF Troubleshooting

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