[TenTec] Help with Tentec Omni 5

[Doc]

I apologise in advance if I have inadvertently sent this note twice.  But
maybe someone can help me with an ailing Tentec Omni 5.

It has the matching power supply.  I turn on the rig it and everything
lights up....but there is no audio from the rig.  This is true whether
through the built-in speaker or the separate speaker.

Can anyone offer some guidance?  It would be much appreciated, thanks.

73,
Doc/K0EVZ