[Icom] IC751A caps mod

Wed, 30 Oct 2002 09:06:46 -0500

I need to add one point here.  To find the range of the VCO cap, just listen
to where the audio drops out on either side of the cap range.  Then estimate
the center based on how far left and right the tool is moved.  Set it in the
middle and you should be good to go.
Bruce K1XR

----- Original Message -----
From: "Bruce Marton" <[email protected]>
To: <[email protected]>
Sent: Wednesday, October 30, 2002 8:59 AM
Subject: Re: [Icom] IC751A caps mod

> Daniel,
> One little trick I have employed over the years to make the 751 continue
on
> without changing the caps is to just get in the VCO can with a plastic
> tuning stick and adjust the caps left and right to find the new range due
to
> the change in value of the cap and then set it about in the middle of the
> range.  The result is the rigs works just fine for at least another 6 or
> more months.  After that, it may need anther touch up.
> All you need is to be somewhere in the range of required voltage for the
VCO
> and the radio will work normally.
> Bruce K1XR
>
>
> ----- Original Message -----
> From: "Daniel I. Nieto" <[email protected]>
> To: <[email protected]>
> Cc: <[email protected]>
> Sent: Wednesday, October 30, 2002 8:33 AM
> Subject: [Icom] IC751A caps mod
>
>
> > I am about to do the famous repair for replacing the caps in the radio
due
> to garbled sound on LSB sometimes, until radio settles down and becomes
> usefull.
> > I just got the trimmers, caps & resistors from Icom in order to
undertake
> the repair but before doing so, given the fact is not a small undertaking,
I
> was wondering if anybody has done such repair and had some word of advice
> for me in doing so.
> > What concerns me most is changing the plastic trimmers inside the metal
> case PLL and have the radio work afterwards, since I do not know how to
> adjust those new trimmers. Is there a bird's eye view to go about this?.
> > Any suggestion/recommendation regarding this or other issue in  my 751A
> repair, will be greatly appreciated, given the fact I am on the side of
the
> world and service for old radios is not easy to come by, oddly enough, you
> can get any kind of new stuff & technology repaired.
> > I have been living with this problem for a while now, always waiting for
> the radio to settle down before using it, but it is becoming worse and
very
> annoying so I just have to do the Icom suggested fix I found on their
site,
> very common for these radios as I learned afterwards. Other than that, I
am
> very happy with my radio and would never think of selling it.
> > Best regards to all from the other side of the world.
> > Daniel Nieto.
> > CE3HRX
> >
> >
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>
> ----
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> Icom Users Net: Sundays, 1700Z, 14.315 MHz
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>