ICOM IC-P4AT ~~~~~~~~~~~~~~~~ EXPD RF 1- Remove power and antenna. 2- Remove screws and open the radio. 3- Install diode D-16 (DA115 symbol AU (see drawing). 4- Reassemble the radio. 5- Reset the microprocessor.(Press and hold [FUNC] and [V/M] and turn ON Wait for display to normalize before releaseing buttons).