To force a full reset, either disconnect the backup battery jumper (chevron pcb pad with a solder blob over it visible through the cutout in the metalwork behind the fromt panel, wait 30 secs and reconnect. Or remove RAM chip from logic/AF board wait 30 seconds and replace - set should beep when next powered up and will have reset to 70.0000MHz.
Check that the EPROM chip is properly seated with all pins correctly inserted into the socket.
N.B. As long as I still have the bits available I can offer a spares/repair/upgrade service for 4m Ascoms if you are having problems
