Janome Jem Platinum 720, Instruction Manual, Page: 40 / 41

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38
Condition Cause Reference
The needle breaks.
Skipped stitches
Seam puckering
The cloth is not fed
smoothly.
The needle thread
breaks.
The bobbin thread
breaks.
1. The needle thread is not threaded properly.
2. The needle thread tension is too tight.
3. The needle is bent or blunt.
4. The needle is incorrectly inserted.
5. The needle thread and the bobbin thread are not set
properly under (drawn to the rear of) the presser foot
when sewing is starting.
6. The fabric is not drawn to the rear when sewing is
finished.
7. The thread is too heavy or too fine for the needle.
1. The bobbin thread is not threaded properly in the
bobbin holder.
2. Lint has collected in the bobbin holder.
3. The bobbin is damaged and doesn’t turn smoothly.
4. The thread is wound loosely on the bobbin.
1. Needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The needle clamp screw is too loose.
4. A proper foot is not used.
5. The fabric is not drawn to the rear when sewing is
finished.
6. The needle is too fine for the fabric being sewn.
1. The needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The needle and/or thread are not suitable for the
fabric being sewn.
4. A blue needle is not being used for sewing stretch,
very fine fabrics and synthetics.
5. The needle thread is not threaded properly.
6. A poor quality needle is used.
1. The needle thread tension is too tight.
2. The needle thread is not threaded properly.
3. The needle is too heavy for the fabric being sewn.
4. The stitch length is too long for the fabric.
* Use a stabilizer for very fine fabrics.
1. The feed dog is packed with lint.
2. The stitches are too fine.
3. The feed dog was not raised after being lowered.
Page 14,15
Page 9
Page 10
Page 10
Page 17
Page 17
Page 10
Page 13
Page 36
Replace the bobbin
Re-wind the bobbin.
Page 10
Page 10
Page 10
Use proper foot.
Page 17
Page 10
Page 10
Page 10
Page 10
Page 10
Page 14,15
Replace the needle
Page 9
Page 14,15
Page 10
Make stitch shorter
Page 36
Make stitch longer
Page 8
The buttonhole is not
sewn well.
The machine does not
work.
Patterns are distorted.
1. The machine is not plugged in.
2. Thread is caught in the hook race.
3. The bobbin winder spindle is still in the winding position.
1. The stitch is not balanced.
1. The stitch density is not suitable for the fabric being
sewn.
2. Interfacing is not being used with stretch fabrics.
Page 4
Page 36
Page 12
Page 35
Page 26
Page 23
Troubleshooting
The needle thread
loops.
1. The needle thread tension is too loose.
2. The needle size is not suitable for the thread. Page 9
Page 10
Noisy operation
1. The feed dog is packed with lint.
2. Lint has collected in the bobbin holder. Page 36
Page 36
Janome Jem 720 Instruction Manual Janome Sewing Machine
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