JUKI DLN-6390 Manuel D'utilisation page 99

Troubles Causes (Items to be checked)
Looping Check whether something is wrong with hook.
(Play of inner hook is large or rotation is not
smooth.)
Irregular thread Check whether thread tension is too low.
tension
Check whether threading is wrong.
Check whether the spring for idle-prevention
is weak.
Check whether cloth is properly rolled.
Puncture of
cloth from
hemming binder
Uneven Check whether cloth is properly rolled.
material feeding
at start and end
of sewing
Check whether position of hemming binder is
proper.
Corrective measures
Replace the hook with a new one.
Increase the thread tension.
Properly pass the thread.
Raise the spring or replace it with a new one.
Adjust by handling so that hemming of the bottom
can be properly performed.
Adjust by handling so that hemming of the bottom
can be properly performed.
(It is important that the cloth is properly rolled by the
hemming binder at the start of sewing.)
Adjust the position to a proper one.
(Rolling is stabilized when the ruler located on the
right side of hemming binder is set to the position
where the bottom surface hardly comes in contact
with the throat plate and the side hardly comes in
contact with the presser foot (asm.).)
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