Treadmill repair – MC60 Controller 5

Just wanted to do a quick post on how i fixed my treadmill motor not for treadmill use but for another project in the future.

note: This is for informational purposes only perform at your own risk.


The treadmill had seen a number of good years, 15+ so it didn’t owe me anything and I didn’t feel bad if I couldn’t fix it but if I could fix it I would have variable speed motor that could handle increased torque demands and it should be useful for a project on down the road.

So I pulled the control board from the treadmill and found it to be an MC-60 unit which seems to be popular for treadmills but schematics aren’t to be had on the internet. As I did some poking around I was able to stumble across a few items of interest, I will post them here for a source of reference but I take no ownership of them as they are the property of their rightful owners.

SNAG-0005 SNAG-0004 SNAG-0003

Without a schematic and me being a novice to electronics repair it would be difficult to trace down the voltage paths and since this was a small piece I opted to take a shotgun approach to fixing it… the treadmill seemed to work until there was a load placed on it or until it got hot. As it encountered with issue the unit appeared to reset itself or cut out and then start right back up. I checked all the resistors for correct resistance and the diodes for any that might be open, un-soldering from the board as needed to check.

Once I had determined what to order I took a look at how much it was going to cost. I could get a “new” refurbishued unit from Ebay for $46.. to my amazement, shipping was the most expensive part! All the parts were found at

SNAG-0001   SNAG-0002

Time to part swap…

I got out my trusy Hako desoldering gun, well worth the money if you do any tpe of electronics repair. When replacing the items I replaced them one at a time just to be sure I didn’t mix up any parts when re-installing.


I pulled the SCR’s and Rectifiers first, I believe one or more may have been the problem.

IMG_1899   IMG_1900

When replacing IC’s that are soldered I have a trick to just cut the legs on the IC for easier removal and then just desolder any legs that are left over, works great..

IMG_1894   IMG_1895   IMG_1896   IMG_1892   IMG_1893


All soldered in and ready to go.


Don’t forget to add some thermal past before reinstalling, I got it a bit heavy there…


Tried it out and she worked like new…




For future use I ran a cross a couple of posts and information on how to utilize my newly repaired controller and motor with a variable resistor..

DC Motor Wiring Diagram MC60 v2   dc_control


SNAG-0007   SNAG-0008   SNAG-0009



Leave a comment

Your email address will not be published. Required fields are marked *

5 thoughts on “Treadmill repair – MC60 Controller

  • Abdulmuhdi Enshassi

    The treadmill is not functioning. The LED’s are not let, the AC voltage across AC1 and AC2 is 80V only although from the outlet it’s 120V. I can not see the fuse next to the rectifying bridge as per the schematic diagram.

      • Abdulmuhdi Enshassi

        I have a treadmill Weslo Cadence DX10. The treadmill is not functioning. The LEDs are not lit. The voltage across AC1 and AC2 is 80V only, although the mains voltage is 120V. There is no voltage across Motor A+ and A- terminals. What could be the cause?
        I could not figure out where is the switch. As per the schematic diag. it’s in series with the breaker, what might be the cause? Thank you.

  • Ron


    Sorry to resurrect this article but I encounter a similar controller that was accidentally plug in 240VAC outlet. The small board with transformer are burn-out with several rectifier diodes. I wonder if you have a schematic of this board? (SB-12)