05-05-2011, 10:37 PM
Ron,
There is an error in the Riders drawings, so it repercuted to the same error in your modified drawings.
the pins at wich the C419 are connected are wrong. They aren't what I saw in my 47-1230, and they aren't what I see in the diagrams. The C419 is connected from GND to R410, the 4th pin from the bottom of the lug strip, not L404, 3rd pin from the top of the lug strip. Note that the 3rd top and 3rd bottom are bolted to the chassis (GND) so the result is that the lead wire needs be placed to the other side.
here's how I think it should be drawn
[Image: http://i146.photobucket.com/albums/r253/...9-WHAT.jpg]
In any case, shorting to the GND resulted in no AM at all, my alternate connections returns AM.
Can you please change that drawing to help future 47-1230 restorations? And, thanks for posting about this capacitor, I wouldn't have known what to do, or what to look for. It was while looking at your drawings that I realised what was going on!
There is an error in the Riders drawings, so it repercuted to the same error in your modified drawings.
the pins at wich the C419 are connected are wrong. They aren't what I saw in my 47-1230, and they aren't what I see in the diagrams. The C419 is connected from GND to R410, the 4th pin from the bottom of the lug strip, not L404, 3rd pin from the top of the lug strip. Note that the 3rd top and 3rd bottom are bolted to the chassis (GND) so the result is that the lead wire needs be placed to the other side.
here's how I think it should be drawn
[Image: http://i146.photobucket.com/albums/r253/...9-WHAT.jpg]
In any case, shorting to the GND resulted in no AM at all, my alternate connections returns AM.
Can you please change that drawing to help future 47-1230 restorations? And, thanks for posting about this capacitor, I wouldn't have known what to do, or what to look for. It was while looking at your drawings that I realised what was going on!
Ron Ramirez Wrote:Marsupial Wrote:I started to follow the readings mentionned in Riders, and identified one capacitor (C419) in the FM stage, that is shorted.Hold it!
Before you go any further with that particular cap, read this page on my site.
http://www.philcoradio.com/tech/ftcap.htm
-Mars
