Macke

I'll do my best to get a full write up of tests performed tonight, but that means I'll probably have it done Sunday 
 
It works though! Full range of speed, even made my first bowl on it today in the rain because I couldn't wait

https://www.digikey.com/en/products/detail/cts-electrocomponents/201UR105B/98359 This link goes to the blue one (low side) and the part number leads to a 1M ohm 0.2W trimmer
 
The high side is the "250k" one. I tried adjusting the dial on them during measurement and there was no resistance across any of the posts in any position, it's like they're completely shot. The plastic tray definitely smelled like hot/burnt electronics as well. If I had to guess, when the cap went bad it probably took this out with it?
 
 

Ok, been awhile since I've given any update on this. The new capacitor I had installed was good, the resistors all checked good, diodes were ok. With some guidance from a friend I bypassed the PCB and pot/pedal, I also installed a 500w $15 work light in place of the motor to test that the bridge, switch and fuse were good. The light turned on, so I connected the motor in that configuration instead of the light and it ran full speed again (hooray!/?)
 
Now I've narrowed it *back* down to the PCB and pot, so tomorrow when I get home from work I'll run a jumper across the terminals for the potentiometer and see if it gets full current and spins full speed that way. Hopefully it does, then I'll only need to track down a replacement 60 year old slide potentiometer. 
 
Worst case scenario, I know how to turn it into a ceramics themed night stand/lamp combo 
 
Once I get it figured out I'll try to post a circuit diagram so anyone else that doesn't want to spend the money on a new control board has some sort of reference material

Ok, so the good news is that nothing exploded, overheated, popped, smoked or otherwise damaged new components. Soldered in a new capacitor, resistor, thyristor and bridge rectifier. 
 
The bad news is that the wheel no longer spins - period. Got a late start today and lost the light, but back to more testing tomorrow  Not even sure where to start now, but one piece at a time as best I can I suppose.  Wish I had more experience with the testing side of things 
 
edit: I have my suspicions that the capacitor is bad, I just checked the second capacitor in the pack and didn't get any sort of reading from it, almost like it's not completing the circuit with the multimeter

The replacement I ordered was NTE56022, it also says TO-48 isolated. I'll have to look up how to test em but the NTE cross reference said it was a direct replacement.
Looks like almost everything will be here Friday, so I'll update this weekend.
All this waiting is giving me plenty of time to get my gardening done at least 
 
 

Just to follow up on this, I lifted both halves of the resistor today and it VERY much looked like brown-black-black-silver/gold which would indicate 10ohm, so I pilfered a 10 ohm resistor from work today and I'll be installing the board again tomorrow to see what happens.  I'm not ready to pay for a new board just yet, but then again the "I'll do it myself" attitude is what got me into pottery in the first place. It was also the much more expensive way to get the bowls and plates that I wanted  Will report back at some point tomorrow though!