[ICOM] Older Icom trimmer caps?

[William Shadid]

Eric,

I have done quite a few of these replacements - IC-765's, IC-751's, and
IC-751A's. The IC-765 was the easiest while the 751's were harder to deal
with and more of a problem dealing with the shield covering the trimmers -
at least in my cases. (Thanks to Bill Diamond, WR0T, for getting me out of a
jam on this at least once!!!) But, with patience all were pretty straight
forward. Contrary to what the service manual says, you do not need an
oscilloscope to do the alignment (voltage setting) after the process. The
alignment is done easily with a good DVM. Look at Adam Farson's fine site to
find more details and pictures, as I recall. See http://www.qsl.net/icom/
for those details. Or, perhaps others can lend you more assistance. It
certainly is not an overly difficult task.

I know that the trimmers are available from supply houses, such as Digi-Key.
But, I have always found that the best, easiest way to get them is to go to
Icom. They are easy to deal with, helpful with suggestions, and the parts
are very reasonably priced.

73,

-Bill, WA9MXQ

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net]On
Behalf Of Eric Wilson
Sent: Wednesday, June 02, 2004 7:07 PM
To: ICOM Reflector
Subject: Re: [ICOM] Older Icom trimmer caps?

Are the trimmer caps easy to replace and do you have a source for them?

Icom 765 wrote:

> Hi Blair,
>
> I just experienced the problem with my 765. It is s/n 47xx and it had
> the plastic cap problem. I first noticed a "raspy" audio on 40m. It
> would come and go. Very intermittent at first! After some time it
> started happening on 80 also. Once it progressed, the receive audio
> would be ok for a couple of minutes then get raspy and then the audio
> would disappear ... gone ... wait 5 minutes and sometime it would come
> back and be ok then a few minutes later raspy again. On 20m I would
> just lose all audio.
>
> Replacing the caps fixed the problem.
>
> If you start thinking everyone is off frequency on 40 or 80 or both
> you might be experiencing the problem.
>
> 73, Mike
>
>