[ICOM] IC-725 PLL Problem

[Dave Noon]

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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>
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Amateur Radio VA3DN
va3dn at execulink.com