[R-390] Broken Line Input Wire in R390?

[Barry]

Hi Jacques,

Actually, I think the A side of FL101 is almost fully open (reads in the M-ohms between Line In and Line Out - probably reading through wax or potting compound) but the wire that runs from output side of the A connection to P118-1 checks completely open (in other words, I'm checking past FL101 to P118-1 and still getting an open reading).

I've replaced the line input on some R390As before with IEC receptacles for the same reason; however, for this R390, I'd like to see if I can open and replace the caps and coils.  I've seen it done and it doesn't look to be too hard to do and it maintains the originality with the line cord, etc.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: "n4buq" <n4buq at knology.net>, "R-390 Mailing List" <r-390 at mailman.qth.net>
> Sent: Monday, October 17, 2022 2:44:47 PM
> Subject: RE: [R-390] Broken Line Input Wire in R390?

> Hi Barry,
> 
> You wrote: "the A side of the line input filter is also showing a very high
> resistance from the A input to the A output"
> I believe that your problem is just there: the inductor in the A side of
> FL-101 opened, or the internal solder(s) failed, whatever...
> I replaced the whole input filter (FL-101) in my set long ago, because it
> was making a GFI tripping and the leakage to GND of internal caps failed all
> the tests.
> I fitted an IEC 320 male receptacle in it's place that include a line filter
> with modern components.
> I also done the same with my three R-390As, and for the same reason.
> I can send you pictures if you are interested.
> 
> The alternate way will be to open your FL-101 and repair it....
> Just hope it is filled with wax, and not epoxy.
> Most probably, the internal inductor on the A side gave up because the
> output capacitor within the filter shorted.
> I also bet that the live side of the 120V line was connected to the A
> side...
> 
> 73, Jacques, VE2JFE in Montreal