hello, i am new and i have a problem i just bought a pq1500s brother sewing machine ,am just learning to use it on a quilting frame and the bobbin locked up on me and i don't know how to fix it or to find the automatic safety device. i have been doing quilts a long time but first time machine quilter and maybe last if i broke my machine to bad. i'm from Idaho and have arabian horses and love to quilt but don't know much about it.If any one has an idea what i did please let me know,thanks