i have 2 dial sewing machine ,toyota STF 27,its handwheel is blocked,and i want to

[jigyasa]

repaire it? model info:-2 dial model of sewing machine,RS2000 STF 27,220-240V~50Hz,Aisin seikico.,Ltd,its 2 year old machine.the handwheel of machine is not moving .tell me how to repaire it