[ICOM] IC756PRO3 no tranmit and receive audio

[Gary Fiber]

I wonder if a ground trace or choke has opened? Used to see that .on handhelds when the operator would try to connect the charger to the earphone jack.

Gary P. Fiber K8IZ



On Jul 28, 2013, at 8:55 PM, George Szymanski <du1gm at dxhams.net> wrote:

> 
> 
> Has any one ever come across this problem? 
> I had a nearby lightning strike which caused a power surge complete
> with sparking sounds from one ac outlet! The computer was connected to
> the rig via the mic socket for digital modes at the time. The computer
> motherboard went south and the rig does not transmit in any audio mode
> but does transmit in CW. There is also no receive audio at all from
> speaker or headphone. The display is fine, as if nothing happened, and
> I can "see" signals as usual so the rest of the rig is fine.
> 
> I'm guessing the problem may be in the 8V supply as that comes through
> the mic socket and, perhaps the 8V regulator is dead. I don't know if
> this supply is common to both transmit and receive audio. 
> Before I do any work I was wondering if anyone in the group had heard
> of this problem before, can confirm my suspicion or can point me in
> the correct direction if my guess is not correct. I can't really
> follow the schematics as my eyes are too tired for all those lines!
> I have a very old 756PRO with no display which I can use for spares. 
> I already checked the 8V regulator (on the PA board) on that rig and
> it's ok to use.
> 
> Thanks in advance
> 
> George, DU1GM
> 
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