[R-390] F103/R390a

[David Wise]

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.