Troubleshooting - Bernette Airlock b64 User Manual

10.3 Troubleshooting

Fault
Fabric does not feed well.
Needle breaks
Thread breakage
Skipped stitches
Irregular stitches
Fabric puckers
Irregular trimming
Fabric piles up
Machine not running
2020-09 EN 5040064.00A.04
Solution
> Lengthen the stitch length.
> Increase the Presser Foot Pressure for heavyweight fabric.
> Decrease the Presser Foot Pressure for lightweight fabrics.
> Check the setting of the Differential Feed.
> Insert the needle correctly.
> Do not pull the fabric while sewing.
> Tighten the Needle Set Screw.
> Use a larger needle on heavyweight fabrics.
> Loosen the Thread Tension.
> Check the threading path.
> Check for tangled or caught thread.
> Insert the needle correctly.
> Insert a new needle; inserted needles may be bent or have a
blunt point.
> Use high quality thread.
> Insert a new needle; the inserted needles may be bent or
have a blunt point.
> Tighten the Needle Set Screw.
> Match the needle size with the fabric/thread.
> Insert the needles correctly.
> Change the type or size of the needles.
> Check the threading path.
> Increase the Presser Foot Pressure.
> Balance the Thread Tension.
> Use high quality thread.
> Balance the Thread Tension.
> Check for tangled or caught thread.
> Check the threading path.
> Check the setting of the Differential Feed.
> Loosen the Thread Tension.
> Check for tangled or caught thread.
> Use high quality thread.
> Shorten the stitch length.
> Decrease the Presser Foot Pressure for lightweight fabrics.
> Check the alignment of the Knives.
> Replace one or both Knives.
> Reduce the Presser Foot Pressure.
> Check the setting of the Differential Feed.
> Check for tangled or caught thread.
> Compress/Baste thick layers of fabric with a conventional
machine before sewing with the Overlocker.
> Connect machine to the power source and switch it on.
> Close the Looper cover.
Appendix
81