I'm building a project based around a treadmill motor. I cannot get the motor controller to put out over 5 volts. I am pretty much a newb with electronics and I'm begging for help. can someone help me troubleshoot this? I've searched for days looking for a diagram for this and I've come up empty handed. I'm trying to run this using a pot on the BLK, WHITE, RED posts
https://www.smugmug.com/gallery/n-VKhKt/


so far I've pulled the diodes that looked like they burned the board and replaced them...still 5v

is it ok to bribe people with paypal donations ?

 

I have not come across a schematic for this version either!
This PWM version is a little more sophisticated over its SCR bridge predecessor, The first place to check is power supply components and the PWM power devices on the H.S.
Max.

 

What caused the diodes to burn out ?
apparently a bad design that did include a heat sink or extra copper for heat dispersion.

Are there any other components that are damaged ?
not that I can see

Are the output transistors\mosfets or any other output devices in working condition ? (which I asked before)
I'm not sure how to test them. but I'm trying to google it now.

Have you tried searching the forum, tread mill control boards have been discussed that many times it's not funny.
I understand but Im such a newb unless its the exact model it's apples to oak trees

Isn't this the second thread regarding this particular board ?
the other thread was about diodes, this is a general cry for help

As I suggested in your previous thread the board looks a bit "mucky" and could do with a clean and a reflow. Going by the condition of the board it looks like it may have been affected by moisture or left outside in the weather.

Never left outside and being a newb reflowing sounds like I would cause more issues attempting it...but I'll throw it in the oven if that may help.

 

mponent

I have not come across a schematic for this version either!
This PWM version is a little more sophisticated over its SCR bridge predecessor, The first place to check is power supply components and the PWM power devices on the H.S.
Max.

not 100% sure mow to do this but I'll do some probing and post the results.

 

Check the components attached to the Heat sink.
They will be the first suspects.
To do any testing, use a light bulb across the motor terminals.
Max.

 

ok, cleaned the board and touched up some connections still nothing. I dont have a diode tester on my multimeter so Im unsure how to test the MOSFETs so I'll just replace them?

good thing they are obsolete and I dont know enough to find a suitable replacement
http://www.digikey.com/products/en?keywords=STW34NB20

anything else I should buy if I find a replacement?