[ICOM] IC-765 question

Wed Apr 22 23:27:19 EDT 2015

No, I cannot suggest any specific caps. If you were to purchase an ESR meter, you can test the caps 'in circuit' easily. It's a great tool. I have several, but if you look on ePay, you can find some great ones, for the $.
When I refurb a radio (as I am doing with my 'new' Collins 75S-3), I double check even the new ones. There is a range of ESR values that the different values fall into.
I do a lot of Lafayette old radios and almost EVERY small value electrolytic cap used in the different stages are 'bad'.......

ron

-----Original Message-----
From: Marc & Tricia Niebergall <mtniebs at gmail.com>
To: ICOM Reflector <icom at mailman.qth.net>
Sent: Wed, Apr 22, 2015 11:17 pm
Subject: Re: [ICOM] IC-765 question

Thanks Ron.  I see that there about 12 or so electrolytics in this power
supply.
I have changed 3. Without the test equipment are there any you
would suspect
over others?
On Apr 22, 2015 7:49 PM, "Ron via Icom" <icom at mailman.qth.net>
wrote:

> Hi, I have a large Icom collection and although I don't have a 765, I
do
> have a 761. If you do your own repairs as I do, the suggestion of
acquiring
> an ESR meter is HIGHLY recommended!
> I now have several and can
state that electrolytic caps are the one
> electronic component that does NOT
age well!
> I replace hundreds / year.
>
> ron
> N4UE
>
>
>
>
>
>
>
>
-----Original Message-----
> From: Marc & Tricia Niebergall
<mtniebs at gmail.com>
> To: ICOM Reflector <icom at mailman.qth.net>
> Sent: Wed, Apr
22, 2015 4:34 pm
> Subject: Re: [ICOM] IC-765 question
>
>
> It's looking like
it is in the internal power supply.  I disconnected it
> and
> jumped a Yaesu
13.8 vdc and "instant on".  Tried the internal power
> supply again
> and a
short "pause" before coming alive.  So, now it is just a
> matter of
> deciding
which components are likely the problem.  May start with
> all the big
>
electrolytics.  They are pretty old and probably getting
> suspect
> anyway.
>
>
Suggestions?
>
> Marc
>
> On Wed, Apr 22, 2015 at 1:13 PM, Bert Almemo
>
<balmemo at sympatico.ca> wrote:
>
> > Most likely the internal PS. The 765 is
known
> for PS problems. If you have
> > an ESR meter, Equivalent Series
Resistor, you
> could possibly measure the
> > elec. Caps without removing them.
If not, maybe you
> can borrow from a
> > friend. It's a great tool to trouble
shoot elec.caps. Good
> luck!
> >
> > 73 Bert, VE3NR
> >
> >
> >
> >
-----Original Message-----
> > From: Icom
>
[mailto:icom-bounces at mailman.qth.net] On Behalf Of Marc &
> > Tricia
> >
>
Niebergall
> > Sent: Wednesday, April 22, 2015 2:29 PM
> > To: ICOM Reflector
>
>
> Subject: Re: [ICOM] IC-765 question
> >
> > Will try that, thanks.
> > On
Apr 22, 2015
> 11:26 AM, "GGLL" <nagato at madryndigital.com.ar> wrote:
> >
> > >
You may try to feed
> the rig with an external power supply to see if it
> > >
has the same behaviour.
> >
> >
> > > Regards
> > > Guillermo - LU5WE.
> > >
> >
> El 22/04/15 a las 15:08, Marc &
> Tricia Niebergall escibió:
> > >
> > >> When
pushing the AC on switch there is
> sometimes a pause of a couple
> > >> seconds
before the rig powers up.  Other
> times it comes on almost
> > >> instantly. 
This usually occurs on the first
> application of the day.
> > >> Don't
> > >>
know if it is a relay or an electrolytic
> capacitor taking time to
> > >>
charge or what.  I changed two 33uf electrolytics
> in the power supply
> > >>
that were swollen, but no change.  Any suggestions are
> welcome.
> > >>
> > >>
Thanks,
> > >> Marc-k7wxk
> > >> ----
> > >> Your Moderator: Dick
> Flanagan
K7VC: icom-owner at mailman.qth.net Icom
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