lt-2n echo board

i tried installing a lt-2n echo board into my cobra 29 xlr, and it was un successful. everything powers up and i hear people very faintly and when i key up nothing happens. im not sure where the mic in and the mic out wires are, and what the mic jack terminals are. the directions for the echo board dont have any information for this radio either. can anybody help?

 

thanks guys. i have the schematic for the radio and the ones that came with the echo board. the only problem is that they dont have the schematic for my cb and the xlr is way different on the circuit board

 

I got its fixed by oening my 29 wx which they hve directions for and looking at that then figuring it out on my xlr. and they do have 29 xlr schematic but only for the radio