[ICOM] IC-781 Gurus IT's ALIVE !!!

[Gary P. Fiber]

Mike,

I was looking at qth.net there is a nice gathering of Icom information. 
I found one on the 781 regulator and its looks like what the techs at 
Icom used to do.
Its funny to see a lot of the information there is some I had a hand in 
gathering, also have seen some scanned "bulletins" with my own hand 
writing on them  haha.

The big listing of causes and cures we got the service techs to give us 
notes about. It was immediately helpful to use and to assist callers 
into tech support.
I have often wished I kept some sort of notebook on the calls but never 
did. Most was kept in my head. during my time at Icom. We only had a 
database for service radios, no real space for technical notes.
I am unsure if that has chanced these days.

Gary K8IZ

On 3/12/2012 9:24 PM, Mike Olbrisch wrote:
> UPDATE to the story of my IC-781 burning up while I was away at the dog
> show.
>
> About 2 weeks ago my some came over.  Since I hurt my back and couldn't get
> behind the desk to remove the IC-781, he did.  A few days ago I thought
> "Ahhh - what the heck".  I plugged it in, turned my head away to protect my
> eyes, and punched the power button.  IT CAME ON !!!  It seems the surge
> protector was what blew!
>
> So now that my back is all better, and I have the radio on the bench, I want
> to give it a good going over before putting it back in service.  It had
> developed a few problems, mostly due to lack of use I think.  Maybe some of
> you 781 GURUs can add a few things to check while I have it open.
>
> ADAM?  GARY?
>
> Here is what I have.
>
>
> #1.  RX is sometimes intermittent.  Tap the mic button, or turn the preamp
> or attenuator off/on and it works for a while.  Let it run a few days and it
> is fine.  The problem is ???
>
>
>
> On humid days when I turn it on for the first few minutes (until it heats
> up) I hear an intermittent arching, I suppose it is coming from the HV CRT.
> This only happens on humid days.  The problem is ???
>
>
>
> Many/most of the controls are dirty/noisy.  I have a can of the "original"
> blue shower. the one that doesn't damage plastic.  I also have DeoxIT D5
> spray, and DeoxIT GN5 (formerly pro-gold) spray.  Any suggestions?  (I think
> the D5 is best for controls.)
>
>
>
> Anything else I might want to look at.  I trust you guys forgot more than I
> know about it.  I want to do this and get it right so the next 5 years or so
> are nothing but FUN!
>
> Thanks for the help.
>
> Vy73 - Mike - KD9KC.
> El Paso, Texas - DM61rt.
> W5-SOTA Association Manager.
> W5-SOTA info: www.qsl.net/kd9kc/
>
>
>
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-- 
Gary Fiber K8IZ
GROL PG-19-6691 with shipboard radar endorsement
Washington State resident