Audio fade to silence

[DesertNomad]

Just installed a 750, 255 and 350c audio panel. The plane is still at the shop finishing up the final testing.

They said this morning that everything is working except when listening to anything... com1, com2, intercom etc, it is loud and clear for 10 seconds or so then fades to silence. The only solution is to unplug and replug the headset. Pilot/co-pilot side same result. If even does it when the audio panel is turned off which I guess forces it to default to com1.

Has anyone ever seen this? The avionics guy is not in the shop yet this morning so I am just going by what the mechanic told me.

Thanks.

 

[Plano Pilot]

I picked up an airplane after a major avionics upgrade including a GMA-35. It had a similar problem. The newer audio panels are wired for left and right channels to the headphone jacks. On our airplane the audio jacks were not wired correctly. The cockpit speaker still worked but when the pilot in the left seat said anything, over the intercom, they lost all audio in the headset.

 

[JonH]

If it were me doing the install I'd keep that to myself

 

[DesertNomad]

A 340 works in the plane so my shop is assuming the 350 is bad