Nokia RM-57 Service Manual page 202

Nokia Customer Care
7. Click Calibrate.
8. Connect the signal generator to the phone.
9. Set frequency and amplitude as instructed in the "Rx Calibration with band GSM850/EGSM900" popup
window.
The calibration uses a non-modulated CW signal. Increase the signal generator level by cable attenuation
and module jig probe attenuation!
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RF Troubleshooting and Manual Tuning Guide
RM-57/58
Issue 1