Troubleshooting - Bernina Bernette 340 deco User Manual

Problem
The machine is noisy.
The needle thread breaks
The bobbin thread breaks.
The needle breaks.
The screen display is not clear.
Skipped stitch
The machine does not run.
Abnormal noise when turning the machine
on
Patterns distorted
Function keys do not work properly.
The machine stops and «Lock» is indicated
on the status line on the LCD touch panel

Troubleshooting

Cause
1 Threads have been caught in the hook
mechanism.
2 Lint has collected in the bobbin holder.
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 inserted incorrectly.
5 The needle thread is not set in the
thread holder when starting the
machine.
6 Sewing speed is too high for the design
being sewn.
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.
1 The needle is inserted incorrectly
2 The needle is bent or blunt.
3 The needle clamp screw is loose.
4 The needle thread tension is too tight.
1 The screen contrast of the visual touch
screen is not adjusted correctly.
2 The screen contrast has been faded due
to a continuous use of the machine.
1 The needle is inserted incorrectly.
2 The needle is bent or blunt.
3 The needle thread is not threaded
properly.
4 The defective needle (rusted, burred
needle eye) is used.
5 The embroidery hoop is not set properly.
6 The fabric is not tightly pulled on the
embroidery hoop.
7 A stabilizer is not being used.
1 A thread is caught in the hook race.
2 The control circuit is not working
correctly.
1 Something is caught between the
carriage and the arm.
2 The carriage is bumping into something
around the machine.
1 The fabric is not pulled tightly on the
embroidery hoop.
2 The embroider hoop is not fixed securely.
3 The carriage is bumping into something
around the machine.
4 The fabric is caught or pulled for some
reason when embroidering.
5 The needle thread tension is too tight.
6 A stabilizer is not used.
7 The needle thread on the wrong side of
fabric is not cut correctly.
1 Key position is not adjusted properly.
2 The control circuit is not working
correctly.
1 the machine is shutdown due to
overloading by thread jamming.
Reference
See page 59
See page 59
See pages 11, 12.
See page 15.
See page 16, 23, 24
See page 16.
See page 12.
See page 28
See page 10
See page 59
Replace the bobbin.
See page 16, 23, 24
See page 16, 23
See page 16
See page 15
See page 27
Adjust the screen contrast. (See page 27)
See page 16, 23, 24
See page 16, 23, 24
See pages 11, 12
Replace the needle.
See page 19
See page 18
Use a stabilizer.
See page 59
Turn the switch off and turn it on again.
Remove the object.
Remove the object.
See page 18
See page 19
Remove the object.
Stop the machine and free the fabric.
See page 15
Use a stabilizer.
Cut extra needle thread on the wrong side.
See page 40
See page 28
Turn the switch off and turn it on again.
Remove jamme threads and start the
machine again.
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