Nokia RM-57 Service Manual page 211

RM-57/58
RF Troubleshooting and Manual Tuning Guide
Tx IQ tuning must be performed on all GSM bands.
Steps
1. From the dropdown menus, set "Operating mode" to "Local" and Band to "GSM850/GSM900".
2. From the Tuning menu, choose "Tx IQ Tuning".
3. Set Mode to Automatic and Edge to Off.
4. Click Start.
Wait until automatic tuning has finished and moved the sliders.
Values are written to the phone memory automatically.
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