Nokia 6680 RM-36 Service Manual page 228

Nokia Customer Care
2. From the Tuning menu, choose GSM -> 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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RF Troubleshooting and Manual Tuning Guide
RM-36
Issue 1