Pfaff COVERLOCK 4.0 -, Руководство пользователя, Страница: 44 / 48

Maintenance 42
Storage
When the machine is not in use, be sure to keep it unplugged. Cover the machine with the dust cover to protect it from
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Servicing
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Trouble shooting
Problem Solution
Fabric does not feed well - Lengthen stitch length.
- Increase presser foot pressure for heavyweight fabric.
- Decrease presser foot pressure for lightweight fabric.
- Check the differential feed.
Needle breaks - Insert needle correctly.
- Do not pull fabric while sewing.
- Tighten needle set screw.
- Use a larger size needle on heavy fabrics.
Thread breaks - Check threading.
- Check for tangled or caught thread.
- Insert needle correctly.
- Insert new needle, current needle may be bent or have a blunt point.
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- Loosen thread tension.
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- 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.
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Irregular stitches - Balance thread tension.
- Check for tangled or caught thread.
- Check threading.
Fabric puckers - Loosen thread tension.
- Check for tangled or caught thread.
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- Decrease presser foot pressure for lightweight fabrics.
- Check the differential feed.
Irregular trimming - Check alignment of cutters.
- Replace one or both cutters.
Fabric jams - Check for tangled or caught thread.
- Compress thick layers of fabric with conventional machine before sewing with
overlock.
Machine does not operate - Connect machine to power source correctly.