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Troubleshooting
Problem Cause Solution
Needles break
• Needles are bent, blunt or da-
maged at the points.
• Fit new needles.
• Needles are not correctly inserted.
• Insert the needles into the retainers
correctly.
• You have pulled the material too
heftily.
• Carefully guide the material with
both hands.
Thread breaks
• Yarn has not been correctly
threaded.
• Thread the yarn correctly.
• Thread tension is too high. • Reduce the thread tension.
• Needles are not correctly inserted.
• Insert the needles into the retainers
correctly.
Stitches are omitted
• Needles are bent, blunt or da-
maged at the points.
• Fit new needles.
• Needles are not correctly inserted.
• Insert the needles into the retainers
correctly.
• Yarn has not been correctly
threaded.
• Check the course of the individual
threads.
• Incorrect needles are fitted.
• Use the correct needles (HA x 1
or 130/705H)
Stitches are irregular
• Thread tension is not correct. • Correct the thread tension.
• Thread is trapped.
• Check the course of the individual
threads.
Seams cause wrinkles
• Thread tension is too high. • Adjust the thread tension.
• Yarn has not been correctly
threaded.
• Thread the yarn correctly.
• Thread is blocked.
• Check the course of the individual
threads.
• Differential feed motion not
adjusted.
• Place the differential feed motion
at "S".
Material is not cut off cleanly
• Upper blade a is blunt or in-
correctly inserted.
• Change the blade a or insert it
correctly.
Material edges ruffle them-
selves
• Too much material in a stitch. • Alter the seam width.
IB_KH4300_33077_LB6.qxd 02.06.2009 13:40 Uhr Seite 20