Anonymous posted an answer for this Kenmore Drop-In Bobbin 16231 Mechanical Sewing Machine:
"You have to unplug the power cord to the the foot pedal. The manual doesn't include this...."
Anonymous posted an answer for this Kenmore Drop-In Bobbin 16231 Mechanical Sewing Machine:
"I had this same problem, it may not be the bobbin though. We thought it was nd tried..."
Sewing Machines 2 answers