Circuit diagram for QFS V50P

[NARES]

I need circuit diagram of QSF-V50P in section of speed control .
QSF-V50P model that have push - pull section
any body have it please help .
if you have  J440043 Volume pcb .I need to buy
my email nares911@yahoo.com
 

Thank you

[Minilab service]

Hello. As I see that J440043-00 is small board in the middle. Are you sure that it is faulty? I do not see something what can be damaged there. Probably problem is in motor driver. It should have different part number. On other side should be label with part number. Also can be broken ( or has bad contact )  potentiometer, which is on third board.