[ICOM] IC-725 PLL Problem

[Tim Moes]

Dave,

 This sounds lie the DDS Loop adjustment that I mentioned as this was a
common problem with this unit. Try turning to the 14.12650MHZ freq,
slightly turn above and below the frequency to see if you have any RX. If it
is completely dead you may have lost the Ref OSC for the PLL.

TNX... Tim
Tim Moes  wd0fkc
www-midwest-technical.com
----- Original Message -----
From: "Dave Noon" <va3dn at execulink.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Thursday, August 11, 2005 9:02 AM
Subject: Re: [ICOM] IC-725 PLL Problem


> Hi Tim:
>
> Thanks for your reply.
>
> The PLL is unlocked on all frequencies. I read a note on a review board
> that some of the IC-725's had this problem because the unit was not
> correctly 'burned in' at the factory. The fellow that wrote the note
> indicated that there was a fix - I wrote him a note but he did not send me
> a reply.
>
> I will try and get a schematic, and then perhaps you can give me some tips
> on where to start.
>
> I appreciate your taking the time to send me this information.
>
> 73  Dave  VA3DN
>
> At 12:17 AM 8/11/05, you wrote:
> >Hi Dave,
> >
> >  Depends if the unit is unlocked on all frequency's or if it is just
> >partially unlocked. Most of Icom PLL units used a trimmer capacitor that
> >after they have aged fail and need to be replaced with a higher quality
> >ceramic trimmer. This failure usually causes a range of freq to either
> >warble or lose tx and rx. The IC-725/726 also has the DDS Loop that
drifts
> >and there is a coil (L30)that has to be adjusted by spreading the turns
of a
> >coil to the correct voltage at 14.12650MHZ.
> >Let me know if this helps out or more detail on how it is unlocking.
> >
> >TNX.... Tim   wd0fkc
> >Tim Moes  wd0fkc
> >www-midwest-technical.com
> >----- Original Message -----
> >From: "Dave Noon" <va3dn at execulink.com>
> >To: <icom at mailman.qth.net>
> >Sent: Wednesday, August 10, 2005 7:25 PM
> >Subject: [ICOM] IC-725 PLL Problem
> >
> >
> > > Can anyone tell me how to fix the IC-725 "PLL Problem".
> > >
> > > Thanks
> > >
> > > Dave  VA3DN
> > >
> > >
> > > Amateur Radio VA3DN
> > > va3dn at execulink.com
> > >
> > >
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> > > Icom Users Net: Sundays, 1700Z, 14.316 MHz
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> > >
> >
> >----
> >Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
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>
> Amateur Radio VA3DN
> va3dn at execulink.com
>
>
> ----
> 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/
>