Goo day
i have a problem with my wife's treadmill.
the problem is that when u start the machine up it count's down 3 2 1 and then throws a spark at the motor brush
then trips at the protection switch.
I had the motor tested and it is 100 %.
disconnected the motor and tested the output voltage. it kicks out 310 v and slowly going down to o and then 0 v.
i did found a current limiter was blown and replaced it but still no luck.
Any help would be much appreciated.
the info on the part is a QQ 2067 pulse power

 

I would suspect the switching devices under the heat sink, QT1 and the one adjacent.
It looks as though you are getting a full on condition instead of a ramp up, which will blow the fuse.
Max.