Merrylock MK740DSA User Manual

32
23. TROUBLESHOOTING CHART
SolutionProblem Page
Fabric does not feed well
Needle breaks
Thread breaks
- Insert new needles, current needles may be bent or have a blunt
point. Use only Singer Branded Style ELx705 Needles
- Tighten needle set screw.
- Insert needles correctly.
- Change type or size of needles.
- Increase presser foot pressure.
- Use a high quality thread.
Irregular stitches
Fabric puckers
Irregular trimming
Fabric jams
Machine does not operate
19
20
20
10
21
10
10
12~18
19
10
8
34
21~29
8
10
10
10
12~18
33
26~29
19
12~18
26~29
19
33
19
20
30
30
10
19
12~18
8
- Lengthen stitch length.
- Increase presser foot pressure for heavy weight fabric.
- Decrease presser foot pressure for lightweight 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 only high quality thread.
- Loosen thread tension.
Stitch skip
- Balance thread tension.
- Check for tangled or caught thread.
- Check threading.
- Loosen thread tension.
- Check for tangled or caught thread.
- Use high quality lightweight thread.
- Shorten stitch length.
- Decrease presser foot pressure for lightweight 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.

Merrylock MK740DSA Specifications

General

Brand	Merrylock
Model	MK740DSA
Category	Sewing Machine
Language	English