Troubleshooting - Lervia KH 4001 Bedienungsanleitung

Troubleshooting

If you should find yourself confronted with any problems during sewing, first consult the respective section of the user manual, which will provide you with
further details relating to the specific operating procedure. By comparing the given details you can ensure that you are operating the machine correctly
and appropriately. If a problem cannot be prevented or rectified in this way, the following procedure could provide assistance in regard to the detection
of operational, installation and machine defects and faults as well as being an aid to trouble shooting.
Contact your nearest specialialist on sewing machines if the difficulties cannot be remedied.
Problem
Upper thread is breaking
Lower thread is breaking
Stitches are omitted
Loops and tangles in the seam
Material is rippled in the vicinity
of the seam
The material is not being fed correctly
Needle keeps breaking
Machine is running noisily or slowly
Machine does not start up
Cause
• Upper thread is incorrectly inserted.
• Upper thread tension is too tight
• Upper thread „matted" (tangled).
• Spool of thread incorrectly inserted-/fitted.
• Needle is bent/blunt.
• Inappropriate combination of needle size/strength
of thread.
• Upper thread „matted" (tangled).
• Fault in run of thread at the spool in the gripper.
• Tension of lower thread is too tight.
• Lower thread is not inserted.
• Needle inserted incorrectly.
• Inappropriate combination of needle size/strength
of thread.
• Dust adhering to the stitch plate
• Sewing garn incorrectly inserted/threaded.
• Wrong adjustment of the thread tension.
• Thread tension is too tight on the rippled side.
• Thread run on the machine is wrong.
• An unsuitable needle has been used.
• Inappropriate combination of needle size/strength
of thread.
• Stitch length selector set at „no feed".
6
• Inappropriate combination needle size/
strength of thread.
• Thread is matted (tangled).
• The darning plate is installed on top of the stitch
plate a .
• Needle inserted incorrectly.
• Inappropriate combination of needle
size/strength of thread.
• You are pulling
the fabric.
• Dust adhering to the stitch plate
• Machine is inadequately lubricated.
• The power plug k is not connected to the power
supply.
• Power switch r of the machine is set at „OFF" („0").
• Foot control has not been pressed down properly.
• Coupling disconnector on the handwheel
at „Spool wind".
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• Thread the upper thread correctly!
• Loosen the upper thread tension a little!
• Thread the upper thread once again!
• Insert the spool of thread once again!
• Change the needle!
• Check the combination needle size/strength of
thread!
• Thread the upper thread once again!
• Insert the spool correctly once again!
• Loosen the low thread tension a little!
• Insert the low thread correctly once again!
• Insert the needle correctly!
• Check the combination, needle size/strength
of thread!
a on the bottom. • Clean the sewing machine!
• Thread the sewing garn correctly!
• Readjust the thread tension!
• Readjust the thread tension!
• Check the thread run and thread the needle correctly!
• Use the matching needle!
• Check the combination needle
size/strength of thread!
• Set the stitch length selector
length (feed)!
• Check the combination needle size/strength of
thread!
• Thread the upper thread once again!
• Remove the darning plate!
• Insert the needle correctly!
• Check the combination needle size/strength of
thread!
• Only allow the material to be tranported by the
feed dog!
a on the bottom. • Clean the sewing machine!
• Lubricate the sewing machine!
• Insert the power plug
a wall socket!
• Set the power switch
• Apply more pressure to the foot control!
is set • Do not forget to press
0
in the handwheel
Solution
at the required stitch
6
k into
r at „ON" („I")!
0 !