Hi - I have an old treadmill (Keys Fitness MS1200) and they no longer make the control board. My R64 is blown and looks like the best bet is to try and replace that part. Looking for the value of R64. Photos for reference. Let me know if you can help. Thanks!

 

New life for an MC2100 motor controller Wiring details in description below ! - YouTube
How To Repair Treadmill Motor Control Board | How To Fix Treadmill Power Supply | Urdu / Hindi - YouTube
MC-2100 Treadmill Speed Control Circuit - YouTube
This is just some examples, that may help you.
Get you magnifying glass ready!
Good luck.......

 

This is just some examples, that may help you.
Get you magnifying glass ready!
Good luck.......

I fear that won't help with this OP, as the examples are for the MC2100 series, different board.
Max.

 

Here is one I put together for the MC2100 however.
PicMicro based
Max.

 

@ MaxHeadRoom,
Thank you for the correction.

 

My R64 is blown and looks like the best bet is to try and replace that part. Looking for the value of R64.

Resistors don't do that to themselves. Some other fault caused too much current through it so replacing the resistor will just result in another burnt resistor - first you need to find and fix the actual fault then you can replace the resistor.