Merrylock 2020 - Troubleshooting Chart

27. TROUBLESHOOTING CHART
51
SolutionProblem Page
Fabric does not feed well - Lengthen stitch length.
- Increase presser foot pressure for heavy weight fabric.
- Decrease presser foot pressure for lightweight fabric.
Needle breaks - Insert needle correctly.
- Do not pull fabric while sewing.
- Tighten needle set screw.
- Use a larger 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.
- Use only high quality thread.
- Loosen thread tension.
Stitch skip - Insert new needles, current needles may be bent or have a blunt
point. Use only HAx1(130/705H) overlock needles
- 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 - Loosen thread tension.
- Check for tangled or caught thread.
- Use high quality lightweight thread.
- Shorten stitch length.
- Decrease presser foot pressure for lightweight fabrics.
Irregular trimming - Check alignment of knives.
- Replace one or both knives.
Fabric jams - Close looper cover before sewing.
- 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.
23
24
24
14
27
14
14
15~21
22
14
7
52
26~36
7
14
14
14
15~21
24
52
31~36
22
15~21
31~36
22
52
23
24
47
47
8
22
8