[ICOM] Bad TX audio on 775

[Igor Sokolov]

The mike is the Heil  Proset for Icoms head set. I do not think overdriving
is the reason. The distortions especially obvious when speaking into the
mike in low voice. 3 or 4 different microphones were tried. I start to
suspect it might be not the chip but some of the electrolytic capacitors
associated with the chip.

73, Igor UA9CDC


> Are you using an "amplified" microphone? - If so it could be overdriving
the
> input.
>
>
> ----- Original Message -----
> From: "Igor Sokolov" <ua9cdc at r66.ru>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Saturday, October 14, 2006 6:01 AM
> Subject: [ICOM] Bad TX audio on 775
>
>
> > Posting this for a friend:
> > His 775 got some distorted audio on TX. Careful tracing led  him to
> > suspect
> > IC8 M5282FP audio amp.
> > Service manual says pin 2 of the IC should be at 3.8V while in practice
it
> > is only 2.6V.
> > Does anybody know where  I can get data sheet on the IC?  Where one can
> > get
> > this IC from? Do you thing it is the IC or  rather some parts
(resistors,
> > capacitors) associated with this IC?
> > Any help would be appreciated.
> >
> > 73, Igor UA9CDC
> >
> > ----
> > 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/
>
> ----
> 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/