Treadmill repair – MC60 Controller

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.

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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 Mouser.com.

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.

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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

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All soldered in and ready to go.

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

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Tried it out and she worked like new…

 

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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

 

 

 

If I was able to help you figure out and fix your problem, buy me a beer! and Thanks..

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2 thoughts on “Treadmill repair – MC60 Controller

  1. Thanks for all this info. Very useful 🙂
    I have a proform 385 treadmill that was humming loudly til I tried the 1500uf cap across the motor feed and that quietened it well when not under load. When i tread on it though the hum comes back on each step. Once I figure out how to fix that too I’ll report back here

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