[ICOM] Re: IC 756 Pro III fuse over-heating?

[Gary Fiber]

Jim,

Icom used a couple of different fuse sizes. I 
can't remember when they started using the 30 amp 
fuses. I challenged some callers when I was there 
after they mentioned using a 30 amp fuse made me 
nervous, it was always 20 amp fuses in the power cord.
I could just see the finals being blown or crispy 
critters etc.  I had to consult the manual and 
then apologize to the caller for my challenge.
Well say either your 756ProIII is running way 
below spec on current draw or thats a heck of a fuse. :)
The OPC-025D is the correct cord. The "D" I think 
designates 30 amp fuses installed.

Gary K8IZ

At 09:17 PM 12/15/2008, you wrote:
>I got my reading glasses and looked at the fuse (that blew) again.  It
>clearly says "FUJI 20A" on both ends.  So it's certainly inadequate
>for the job
>
>What's interesting is that the ICOM power harness I'm using probably
>came from my original IC-756 (with the black/white screen). I wonder
>if it had lower current requirements.  I can't believe I've been
>running "on the edge" for so long without problems (until recently).
>
>I checked the IC-756 Pro III power harness and it indeed is loaded
>with 30A fuses.  However, the spare fuse I found in the box, which I
>used this past weekend, was only rated at 20A.  Strange...
>
>Anyway, I now know what to do....
>
>73 - Jim AD1C
>
>On Mon, Dec 15, 2008 at 3:37 PM, Jim Reisert AD1C
><jjreisert at alum.mit.edu> wrote:
>
> > I've had problems the last couple of weeks with my IC756 Pro III
> > shutting down in the middle of transmitting.  This weekend I traced it
> > to the fuses (which were getting warm to the touch).  I  notice that
> > my SS-30 power supply reports ~ 20 amps being drawn on transmit, and
> > the fuses are rated at 20 amps.
> >
> > **  Is 20 amp draw during full-power transmit normal?
> >
> > **  Are the fuses supposed to be 20A?
> >
> > **  Should I replace with 25A fuses, or 20A slow-blow, or is there a
> > bigger problem here?
> >
> > Thanks & 73 - Jim AD1C
>
>--
>Jim Reisert AD1C/Ø, <jjreisert at alum.mit.edu>, http://www.ad1c.us
>"Let Not Mankind Bogart Love" - Willie Nelson
>----
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Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident