Model: IC-765 Bulletin: B4005 Subject: Modification for improved T/R switching time (PREVENTS DAMAGE TO D45, D46, D47, Q15 ON RF BOARD) PARTS NEEDED: 47K 1/8 WATT RESISTOR 150K 1/8 WATT RESISTOR 1SS53 DIODE INSULATION FOR THE RESISTOR LEAD 1. REMOVE BOTTOM COVER. 2. REMOVE SCREWS FROM MAINT UNIT AND LIFT BOARD. 3. REMOVE R10 (39k) AND R11 (39K) NEAR IC-2. 4. INSTALL ONE END OF THE NEW R11 (150K) TO FOIL TRACE WICH CONNECTS TO C13. INSULATE REMAINING LEAD OF R11 AND SOLDER IT TO PIN 3 OF IC-2. 5. INSTALL NEW R10 (47K). 6. SOLDER D159 (1SS53) BETWEEN PINS 3 AND 13 OF IC-2. CATHODE SIDE OF DIODE (STRIPPED END) GOES TO PIN 3. 7. MODIFICATION IS COMPLETE. NO ADJUSTEMENT IS NECESSARY. REINSTALL THE MAIN UNIT AND BOTTOM COVER.