Janome Sewist 780DC, Instruction Manual

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62
Troubleshooting
Condition Cause Reference
The needle 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 threads is not set under the presser foot when start
sewing.
6. The thread is either too heavy or too fine for the needle.
Page 21
Page 14-15
Page 17
Page 17
Page 23
Page 17
The bobbin thread
breaks
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 does not turn smoothly.
4. The thread is wound loosely on the bobbin.
Page 20
Page 59
Change the bobbin.
Page 19
The needle breaks 1. The needle is incorrectly inserted.
2. The needle clamp screw is loose.
3. The threads were not drawn to the rear after sewing.
4. The needle is too fine for the fabric being used.
5. An inappropriate presser foot is used.
Page 17
Page 17
Page 26
Page 17
Use the correct foot.
Skipped stitches 1. The needle is incorrectly inserted, bent or blunt.
2. The needle and/or threads are not suitable for the work being sewn.
3. A blue tip needle is not being used for sewing stretch, very fine fabrics
and synthetics.
4. The needle thread is not threaded properly.
5. A poor quality needle is used.
Page 17
Page 17
Use the stretch stitch
needle.
Page 21
Change the needle.
Seam puckering 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.
5. A stabilizer is not used when sewing very fine fabrics.
Page 14-15
Page 21
Page 17
Make stitch shorter.
Apply a stabilizer.
The fabric is not
feeding smoothly
1. The feed dog is packed with lint.
2. The stitches are too fine.
3. The feed dog is not raised after “drop feed” sewing.
Page 59
Make stitch longer.
Page 16
Loops on the seams 1. The needle thread tension is too loose.
2. The needle is too thick or too fine for the fabric.
Page 14-15
Page 17
The machine does
not work
1. The machine is not plugged in.
2. Thread has been caught in the hook race.
3. The bobbin winder spindle is not returned to the left after bobbin
winding.
Page 6-7
Page 59
Page 19
Buttonhole sewing
is not sewn properly
1. The stitch density is not suitable for the fabric being sewn.
2. The interfacing has not been used for the stretch or synthetic fabric.
3. The buttonhole lever is not lowered.
Page 38
Apply an interfacing.
Page 37
The machine is
noisy
1. Thread has been caught in the hook race.
2. Lint has built up in the hook race or bobbin holder.
Page 59
Page 59
Auto thread cutting
failed
1. Thread is too thick for the auto thread cutting.
2. Threads have been caught in the thread cutter mechanism.
Page 26
Page 59