[ICOM] IC756PRO3 no tranmit and receive audio

[bonddaleena at aol.com]

I had a similar problem last year. The AC line took a direct lightning hit which fried a LOT of stuff in the house and radio room. The PRO had no antennas connected but somehow the spike took out some chokes at the acc connector. Few other diodes were toast as well. Receiver worked perfect, but no xmit.....

ron
N4UE

 

 

 

-----Original Message-----
From: Stephen Budensiek <kzerosd at gmail.com>
To: ICOM Reflector <icom at mailman.qth.net>
Sent: Tue, Jul 30, 2013 4:08 pm
Subject: Re: [ICOM] IC756PRO3 no tranmit and receive audio


George,
   I had a similar problem about a year ago with a IC-756Pro.   Do you have
the CI-V connected to the computer?  Did you loose that also?  I had Q652
fried, Q3772 was burnt, some chokes were burnt open around the back acc
plug where I interfaced to the RTTY DSP audio in and out in the computer,
IC311 and IC331 in the audio mute circuit was blown.   It had come in the
demod line on the acc socket, and gotten several IC's.  Got it repaired,
but it was a little crazy for abit.

73's de Stephen, K0SD


On Sun, Jul 28, 2013 at 11:55 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
>
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>
----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/
To support QSL/QTH.net: http://www.qsl.net/donate.html