Uh-oh. Here I go again--elbow deep in my Elna Supermatic.
Then I decided to upgrade the cam holder. This Supermatic had the original, screw-down cam holder. The cams were a pain to remove. Later Supermatics came with a push-button cam holder--when the button is pushed, the cam pops up on it's own. Long story short, I upgraded my machine with the newer style cam holder, since all the cams I had were intended for this type anyway.
. . . and on the inside of the base of the machine.
Now that I've been doing a lot more decorative stitching, I want access to all those fancy stitches I could be stitching out on my Elna Supermatic. So, I decided to disconnect that pesky capacitor. Even after examining wiring diagrams, though, I wasn't sure if disconnecting one wire from the terminal would be enough. And I wanted to make sure that no more power is running through the capacitor.
So I cut out the two white wires from the bottom. I should probably mention at this point that the machine was unplugged and any remaining charge in the capacitor had plenty of time to dissipate. As you can see, one of the wires is discolored. This is the wire that was attached to the part of the capacitor that was melting away.
And this is what the inside looks like now. When I first plugged it back in, it ran on it's own, and I was sure I had just made matters worse. However, when I took the bottom of the machine off again, I noticed I forgot to put the spring back on the peg. See it dangling there at the top of the photo? It supports the weight of the knee lever, and keeps it from running the machine until it's pushed.
I put it back, and the knee lever worked correctly again. After that, I did an hour or two of sewing, stitching out some cam samples, playing with the tension, and some of the feet. There was no more sizzling noise coming from the machine. I didn't electrocute myself. Nothing exploded, or caught on fire. So--I would call this project a success! And (bonus) my Kenmore circular decorator fits this machine--just imaging the possibilities. I'm glad I can use my Supermatic again. :~)