Mc2100 treadmill board tripping electric , found burnt parts

MaxHeadRoom

Joined Jul 18, 2013
28,511
The 203 are 2k SMT resistors ~2W,, the 4 pin IC appears to be a 4 pin opto, can you trace where the four pins end up?
The SMT should be available at any parts vender, Digikey, Mouser etc.
 

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Liam appleby

Joined Oct 19, 2023
4
The 203 are 2k SMT resistors ~2W,, the 4 pin IC appears to be a 4 pin opto, can you trace where the four pins end up?
The SMT should be available at any parts vender, Digikey, Mouser etc.
Thanks for getting back to me so soon max , I seen you responded in some similar posts about this board , not to clued up on circuits but willing to learn , so from the pictures why would it go black after the ic the 2ksmts don’t seem to track to anything . Cheers
 

MaxHeadRoom

Joined Jul 18, 2013
28,511
That version of the MC2100 is one I am not really familiar with, they came out with quite a few different adaptations along the way.
Blacking of the board indicates it has really over heated at that point, usually due to component stress.
 
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