Model: IC-765 Bulletin: B2601 Subject: The antenna tuner on some IC-765s "hunts" during transmit after the first tuning phase is complete. This may start after a few months of use. Information: The feedback circuit that controls the tuning motors may become sensitive after a few months of use. 1. Remove the top cover and locate the antenna tuner board. 2. Locate R5 and R10 and set them to the center of their range. 3. Set the following controls on the radio as indicated below: Tuner - On Frequency - 7.1 MHz Mode - LSB 4. Transmit for 10 seconds. 5. Verify V-ref at R4 is between 4.6 and 5.3 VDC. 6. Adjust R5 for a voltage that is one half of what was measured in step 5 +/- 0.1 VDC measured at R2. 7. Adjust R10 for a voltage that is one half of what was measured in step 5 +\- 0.1 VDC measured at R7. 8. Verify proper tuner operation on all bands. 9. Reinstall the covers and return the radio to operation.