I need to repair this DC Motor speed control board. I probably need to replace the power components (Mosfet , Mospec diode, SCR etc ).
Two resistors on this board are burned ( bands not visible)
R.3 which is positioned opposite the S6025L
R.17 which is near the red led "down".

What is ic U.1 . Looks like opto but has 5 pins (more like 6 with 1 snipped out) ?

Thank you .

 

Most likely Mosfet as SCR control is rarely used on a T.M.
Any more without further info is pure speculation?
Max.