Bernette b64 AIRLOCK - Troubleshooting

14
Troubleshooting
Fault Remedy
Fabric does not feed well. • Lengthen stitch length.
• Increase presser foot pressure for heavy weight fabric.
• Decrease presser foot pressure for light weight fabrics.
• Check the setting of di󰀨erential feed.
Needle breaks • Insert needle correctly.
• Do not pull fabric while sewing.
• Tighten needle set screw.
• Use a larger needle on heavy fabrics.
Thread breaks • Loosen thread tension.
• 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.
Skipped stitches • Insert new needle; current needles may be bent or have a
blunt point.
• Tighten needle set screw.
• Insert needles correctly.
• Change type or size of needles.
• Check threading.
• Increase presser foot pressure.
• Use a high quality thread.
Irregular stitches • Balance thread tension.
• Check for tangled or caught thread.
• Check threading.
Fabric puckers • Check the setting of di󰀨erential feed.
• Loosen thread tension.
• Check for tangled or caught thread.
• Use high quality weight thread.
• Shorten stitch length.
• Decrease presser foot pressure for light weight fabrics.
Irregular trimming • Check alignment of knives.
• Replace one or both knives.
Fabric piles up • Lengthen stitch length.
• Check the setting of di󰀨erential feed.
• Check for tangled or caught thread.
• Compress thick layers of fabric with conventional machine be-
fore sewing with overlock.
Machine does not operate • Connect machine to power source and switch it on.
• Close the hook cover.