If everything works besides the PTT and Mic audio then the straps are probably missplaced or broken. Check the placement against the manual, check that you have the box the same way as on the picture in the manual. If straps are placed OK check them with an ohm meter, they can have been broken when pressed into the socket, even if it's not visible. There is no settings that can be wrong, only straps or the Mic-cable from Radio-RRC to Radio.
73 de mike