how can i fix a HUSQVARNA optima 150 sewing machine ??

first suggestion is to take it back to person who fixed it,he should know where he adjusted or loosened the first time.not so easy to tell problem but i can only imagine he loosened the pattern selector and fitted it wrongly.it could also be the balance that is not adjusted correctly. this is a job that needs to be done in correct sequence or you gonna end up with a serious malfunction machine.sorry cant be of more help but difficult to predict problem without seeing where to adjust.

johan
February 2012