My Treadmill Model T-1700, fuse blowing immediately connected to power !! i Changed Fuse and check all parts as Diod pole and other Motor Driver supply part without 2 parts as transistor ! because seller erase item number of those two parts so could you help me to which which items are as SCR/Rectifier/IGBT/Mosfet .... ?

may those parts fault can happen for Fuse Blowing ?

 

If you have two heat sinked semi's then the drive could be probably PWM control and the two semi's would normally be Hexfets.
The other type used is a bridge with two rectifiers and two SCR's with a total of four heat sinked semi's.
Either way, the H.S. semi's are the likely candidates, remove them and check for shorts.
The evidence of a large electrolytic Cap and bridge rectifiers point to PWM, test the four power rectifiers in the bridge on the board (top centre).
Max.