Model: IC-765 Bulletin: B4001 Subject: Modification for improving monitor volume FOR RADIOS WITH SERIAL NUMBERS BELOW 2000 1. SET RADIO FOR 8 MHZ IN LSB 2. ADJUST C226 FOR 1 TO 1.2V AT R201. 3. VERIFY THAT IT GOES TO 3V AT 7.9999MHZ CHANGE R85(10K) ON MAIN UNIT TO 4.7K.