Need Melco help

I have a Melco EMC 10/4 . One of the heads won't turn off. It still puts the needle down like its embroidering. I know I can use that as my main head, but it shouldn't do that in the off position. Any one know what it is?

Location: 
United States

SEGURAMENTE ES EL SOLENOIDE DEL RECIPROCADOR, HAY UNA FORMA DE DESACTIVARLO PARA QUE YA NO BAJE LA AGUJA O EN SU CASO CAMBIAR LA PIEZA