do you know how to time a machine? It's not that
difficult and you may be right. The needle may be hitting the looper or
other part of the bobbin.

Jim Chandler

Yes, but it sews fine on straight stitch, the only check I did before I
bought it unfortunately. It's the timing of the zigzag that's gone
crazy. It might need a PCB repair, but it's just not enough fun.