Gday, so i’ve managed to get for free a Proform treadmill, the issue i am getting is that after a period of time of running it will stop. So long story short Ive stripped up down and got to the motor speed control board, I’ve identified a few components have been affected by corrosion and need replacing, i just need help identifying these components so i can repair the board, unsure whether this will fix it but replacing them will be a good start.

Any help would be appreciated.

 

The fact that it runs for some time is a positive sign. How ling does it run? Check for overheated components, especially that Q5 transistor.

 

The fact that it runs for some time is a positive sign. How ling does it run? Check for overheated components, especially that Q5 transistor.

It varies really, not necessarily under any certain conditions, we just notice that the speed randomly fluctuates ever so slightly, somewhat like its leading up to cutting out upon closer inspection i can see the trim pot 1 of the legs has completely corroded away.

 

Call @MaxHeadRoom

 

Sounds like it could be motor load, i.e., friction in the drive and/or belt somewhere,'
You could confirm this by removing the motor and run it free .
Which of these components do you need the value of?
BTW, there are at least 5 or 6 versions of this board.
I have one here that is a very close match.
Also there is a reverse-engineered schematic posted on the site that is generally close to most of these MC2100 boards

 

These are the corroded components

 

Hello,

The yellow part is a potmeter of 200k. Likely a 220k or 250k will also work.

Bertus

 

leaked cap is missing... two SMD capacitors do not have written value but ... may still be ok to measure (once taken out of board). one of resistors is not clear, better picture would help. trimmer potentiometer is 200k and should be no problem to find substitute. corroded header connector seem to be 2mm pitch (easily measured). hard to judge from this angle. common headers are 0.1" or 2.54mm pitch.

Edit... 93 is also code...
so 93C = 90900 Ohm, 91k will do

 

The pot is 180k , electrolytic 10μF. Can you find out what R26 is connected to?
I have a similar board but through-hole version.
Values on through-hole ver same AFAIK.