[R-390] F103/R390a

[pete wokoun, sr.]

You can get a power distribution drawing showing current levels throughout 
the receiver on my website at:

http://www.qsl.net/kh6grt/page4/r390aschematics/r390aschematics.htm

It's the last one down on the list.


>From: "David Wise" <David_Wise at Phoenix.com>
>To: <r-390 at mailman.qth.net>
>Subject: RE: [R-390] F103/R390a
>Date: Mon, 12 Dec 2005 15:48:48 -0800
>
>I can't see how the electrolytic filter caps C603 and C606
>could do it; they're upstream of F103.  I'd plug in each module
>in turn as Joe suggests below, with a milliammeter in place of F103.
>Due to the charge in the electrolytics, you'd better fuse the meter
>even though F102 is above it.
>
>F103's output goes to the RF, IF, Crystal, and VFO modules.
>If one makes the meter peg, you've narrowed it down.  In fact,
>if it pegs without any modules, then you've narrowed it down to
>the harness, S101, or S102.
>
>Dave
>
> > -----Original Message-----
> > From: Joe Foley [mailto:redmenaced at yahoo.com]
> >
> > Do the resistance checks in the manual especially the
> > wiring harness.  It may be the input filter, maybe bad
> > caps in there?  Then unplug all the modules and see if
> > the fuse still blows with just the wiring harness
> > hooked up.  It might be a good idea to put a light
> > bulb in series with the hot line, just so that blows
> > instead of something expensive.
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