Batboard

I have a D44 KXA7JA5BK - Spectra that I want to change to an A7 head.
I have a working A7 head off a 900Mhz Spectra.
I have changed the location 6060 to ED from AF with Spectra LAB.
Now the problem is after installing the A7 head, the transmitter stays keyed as soon as it is turned on - with no mic pluged in.
I didn't have that problem with the A5 head.
Any suggestions ?

Wrong interface board between the command board and the control head.
Use the interface board the A7 head was used with.

Will,

You hit it exactly right...

Thanks