26. TROUBLESHOOTING CHART
Problem
Fabric does not
feed well
Needle breaks
Thread breaks
Stitches skip
Irregular stitches
Fabric puckers
Irregular trimming
Fabric jams
Machine does not
operate
Solution
— Lengthen stitch length
— Increase presser foot pressure for heavy weight
fabric
— Decrease presser foot pressure for light weight
fabric
— Insert needle correctly
— Do not pull fabric while sewing
— Tighten needle set screw
— Use a larger needle on heavy fabrics
— Check threading
— Check for tangled or caught thread
— Insert needle correctly
— Insert new needle, current needle may be bent or
have a blunt point
— Use a high quality thread
— Loosen thread tension
— Insert new needle, current needle may be bent or
have a blunt point
— Tighten needle set screw
— Insert needle correctly
— Change type or size of needle
— Check threading
— Increase presser foot pressure
— Use a high quality thread
— Balance thread tension
— Check for tangled or caught thread
— Check threading
— Loosen thread tension
— Check for tangled or caught thread
- Use high quality light weight thread
— Shorten stitch length
— Decrease presser foot pressure for light weight
fabrics
— Check alignment of knives
— Replace one or both knives
— Close looper cover before sewing
- Check for tangled or caught thread
—
Compress thick layers of fabric with conventional
machine before sewing with overlock
— Connect machine to power source
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