12-24-2018, 11:24 PM
Thanks, Nathan. I actually have that one (I have a rough FM-50 out in the garage too...trying to decide whether to fix it up, or not). I'll take a look at it. Obviously the FM-50 schematic will have no MPX detector but might have some useful info if it doesn't work upon initial power up.
This evening, I accomplished the following:
* Replaced the selenium rectifier with a terminal strip and individual 1N4007 diodes. I threw the old selenium rectifier in the trash; it made a sound as it hit the bottom of the can, so I know it was bad.
* Replaced the axial 20 uF, 250V electrolytic with a new Nichicon axial 22 uF, 350V.
* Replaced the death cap with a new X1/Y2 safety cap.
Still to come: Replacing two 0.1 uF dog turd caps with new yellow film, and the 8 uF axial electrolytic in the ratio detector circuit. Then comes the MPX decoder, and restuffing the electrolytic.
I won't finish it tomorrow. Probably sometime in January.
This evening, I accomplished the following:
* Replaced the selenium rectifier with a terminal strip and individual 1N4007 diodes. I threw the old selenium rectifier in the trash; it made a sound as it hit the bottom of the can, so I know it was bad.
* Replaced the axial 20 uF, 250V electrolytic with a new Nichicon axial 22 uF, 350V.
* Replaced the death cap with a new X1/Y2 safety cap.
Still to come: Replacing two 0.1 uF dog turd caps with new yellow film, and the 8 uF axial electrolytic in the ratio detector circuit. Then comes the MPX decoder, and restuffing the electrolytic.
I won't finish it tomorrow. Probably sometime in January.
--
Ron Ramirez
Ferdinand IN
