Looking for....

How different from MC60 (found that)?

 

Here.
Cannot vouch for accuracy.
Max.

 

From what I understand it is a higher motor rated version, maybe the difference is in the switching device size?
Max..

 

Recently, an MC-80 Rev A Motor Controller came into my possession. I am using it to adapt my Jet 12-36 wood lathe to use a treadmill motor for its power. That allows the adjustment of the lathe speed from 0 RPM to too much. Since I had reverse-engineered the MC-60 motor controller back in 2009 and that proved useful to others, I decided to do the same for the MC-80 controller. After about a week of eye-straining effort, I have attached the schematic I developed. As before, I do not guarantee that it is 100 percent accurate.

 

Wow, you are ahead of time did it in Dec 2017!

I am just in the process of documenting a MC-60 rev-J and noticed it is quite a bit different that the earlier ones reverse engineered?
I thought the later versions, MC-80 etc, were PWM, or maybe just the MC-70?
Max.

 

First time I have seen a large (2200μf) cap across the motor on a SCR bridge type controller.
Max.

 

@trolley1 How did you obtain the component annotations, most are under the components themselves which often has to be removed to see them?
Or did you use your own?
Max.

 

I was able to move the components slightly and see the designators. For only 1 or 2 items was that impossible and I was able to deduce what they were. I did not put values on the 2% blue resistors. For the life of me I cannot determine the color bands on the blue background. And most of the 2 %ers are in parallel with others making measurement impossible.
Tom

 

For the life of me I cannot determine the color bands on the blue background

One trick I've used is to get a sharp close-up pic of the resistor, then analyse the R,G,B components of the pic in a graphics editor on my pc.

 

One trick I've used is to get a sharp close-up pic of the resistor, then analyse the R,G,B components of the pic in a graphics editor on my pc.

I will definitely have to try your technique.