Model: IC-765 Bulletin: B4004 Subject: THE FEEDBACK CIRCUIT THAT CONTROLS THE TUNING MOTORS BECOMES SENSITIVE AFTER A FEW MONTHS OF AGING. IT REQUIRES A ONE TIME ADJUSTEMENT TO CORRECT. 1. REMOVE TOP COVER AND LOCATE THE ANTENNA TUNER BOARD. 2. LOCATE R5 AND R10 AND SET THEM TO THE CENTER OF THEIR RANGE. 3. SET RADIO AS FOLLOWS: TUNER ON FREQUENCY 14.100 MHZ MODE RTTY 4. AFTER TRANSMIT IS ENGAGED FOR 30 SECONDS, 5. ADJUST EACH CONTROL (R5 AND R10) SO NEITHER MOTOR TUNES WHILE CHANGING FROM SSB TO RTTY AND BACK TO SSB. ** NOTE: R5 (RIGHT) CONTROLS RIGHT MOTOR AND R10 (LEFT) CONTROLS LEFT MOTOR. 6. REPEAT THIS ADJUSTMENT TO VERIFY PROPER OPERATION AND THEN CHECK ON ALL OTHER BANDS. 7. REINSTALL TOP COVER AND RETURN TO OPERATION.