Logical trouble shooting is required,, it is extremely rare to have a bad motor.
Generally the reverse engineered schematic is sufficient.
There is the motor Mosfet/BJT circuit with associated driver and also the SCR ramp up of the DC voltage.
Do not trouble shoot with motor attached, use a dummy load.

the mosfet / igbt was replace with original one and also the mosfet/drive..the circuit was checked and some had blown smd resistenaces near the igbt gate that i have also changed.
the SCR circuit that ramps dc voltage to caps its pointless..you keep saying the SCR.the Scr / Thyristor just acts like a relay..thats all.it loads the caps with dc from the bridge rectifier

 

Logical trouble shooting is required,, it is extremely rare to have a bad motor.
Generally the reverse engineered schematic is sufficient.
There is the motor Mosfet/BJT circuit with associated driver and also the SCR ramp up of the DC voltage.
Do not trouble shoot with motor attached, use a dummy load.

i will remake the motor and i am pretty sure thats the nr 1 cause for this boards to go out

 

.you keep saying the SCR.the Scr / Thyristor just acts like a relay..thats all.it loads the caps with dc from the bridge rectifier

Wrong in this case, the SCR is used to ramp up the DC slowly, if it is shorted, the full voltage is across the motor at start.

 

Wrong in this case, the SCR is used to ramp up the DC slowly, if it is shorted, the full voltage is across the motor at start.

Actually wrong.Thyristors get a fix signal input at the gate,they dont controll the flow of the curent.when gate voltage is prezent at the gate it triggers conductivity from the anode to the chatode.further voltage at gate after current flow is made changes nothing.thyristor continues to conduct until voltage of the circuit drops under a certain treshold

 

so its just a

Actually wrong.Thyristors get a fix signal input at the gate,they dont controll the flow of the curent.when gate voltage is prezent at the gate it triggers conductivity from the anode to the chatode.further voltage at gate after current flow is made changes nothing.thyristor continues to conduct until voltage of the circuit drops under a certain treshold

so its just a silicon switch !

 

so its just a
so its just a silicon switch !

needless to say i have changed the thirystor and also the driver which is just an opto

 

What I intended to imply is that the SCR is switched from the start of the ripple with a gradual ramp up to maximum from the MicroProc.
IOW, it is a phase angle controlled ramp-up of the DC.

 

What I intended to imply is that the SCR is switched from the start of the ripple with a gradual ramp up to maximum from the MicroProc.
IOW, it is a phase angle controlled ramp-up of the DC.

oh right