Kompernass KH 4001 manual Troubleshooting, Problem Cause Solution

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	Cause	Solution
	• Upper thread is incorrectly inserted.	• Thread the upper thread correctly!
	• Upper thread tension is too tight	• Loosen the upper thread tension a little!
	• Upper thread „matted” (tangled).	• Thread the upper thread once again!
Upper thread is breaking	• Spool of thread incorrectly inserted-/fitted.	• Insert the spool of thread once again!
	• Needle is bent/blunt.	• Change the needle!
	• Inappropriate combination of needle size/strength	• Check the combination needle size/strength of
	of thread.	thread!
	• Upper thread „matted” (tangled).	• Thread the upper thread once again!
Lower thread is breaking	• Fault in run of thread at the spool in the gripper.	• Insert the spool correctly once again!
	• Tension of lower thread is too tight.	• Loosen the low thread tension a little!
	• Lower thread is not inserted.	• Insert the low thread correctly once again!
	• Needle inserted incorrectly.	• Insert the needle correctly!
	• Inappropriate combination of needle size/strength	• Check the combination, needle size/strength
Stitches are omitted	of thread.	of thread!
	• Dust adhering to the stitch plate a on the bottom.	• Clean the sewing machine!
	• Sewing garn incorrectly inserted/threaded.	• Thread the sewing garn correctly!
Loops and tangles in the seam	• Wrong adjustment of the thread tension.	• Readjust the thread tension!
	• Thread tension is too tight on the rippled side.	• Readjust the thread tension!
Material is rippled in the vicinity	• Thread run on the machine is wrong.	• Check the thread run and thread the needle correctly!
	• An unsuitable needle has been used.	• Use the matching needle!
of the seam
	• Inappropriate combination of needle size/strength	• Check the combination needle
	of thread.	size/strength of thread!
	• Stitch length selector 6 set at „no feed”.	• Set the stitch length selector 6 at the required stitch
	• Inappropriate combination needle size/	length (feed)!
The material is not being fed correctly	strength of thread.	• Check the combination needle size/strength of
	• Thread is matted (tangled).	thread!
	• The darning plate is installed on top of the stitch	• Thread the upper thread once again!
	plate a.	• Remove the darning plate!
	• Needle inserted incorrectly.	• Insert the needle correctly!
	• Inappropriate combination of needle	• Check the combination needle size/strength of
Needle keeps breaking	size/strength of thread.	thread!
	• You are pulling	• Only allow the material to be tranported by the
	the fabric.	feed dog!
Machine is running noisily or slowly	• Dust adhering to the stitch plate a on the bottom.	• Clean the sewing machine!
	• Machine is inadequately lubricated.	• Lubricate the sewing machine!
	• The power plug k is not connected to the power	• Insert the power plug k into
	supply.	a wall socket!
Machine does not start up	• Power switch r of the machine is set at „OFF” („0”).	• Set the power switch r at „ON” („I”)!
	• Foot control has not been pressed down properly.	• Apply more pressure to the foot control!
	• Coupling disconnector on the handwheel 0 is set	• Do not forget to press
	at „Spool wind”.	in the handwheel 0!

- 17 -