JUKI MF-7800D Series, Engineer'S Manual

Page: 154 / 165

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5-7) Skipping in top covering 7-A) Spreader A-1) Incorrect shape of pointed end Replace it with the genuine part.
switch (Left) disables scooping a thread.
7-B) Needle B-1) Needle bend, improper needle Replace the needle with the new one,
attaching and wrong needle Use UY128GAS.
7-C) Spreader adjustment C-1) Incorrect light, protruding amount, Refer to the standard adjustment figures.
position, front and rear
7-D) Spreader thread guide D-1) Incorrect height, position Refer to the standard adjustment figures.
7-E) Needle height E-1) Needle bar position is too low. Refer to the standard adjustment figures.
7-F) Threading F-1) Incorrect threading Refer to threading diagram.
7-G) Spreader thread tension G-1) Spreader thread tension is too Increase tension.
weak.
7-H) Spreader pull-off drawing-in H-1) Incorrect drawing-in amount of Refer to the standard adjustment figures.
amount of thread thread
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Trouble (1) Trouble (2) Cause (1) Cause (2) Corrective measures
Skipping in top covering stitch by left needle
Left needle does not scoop top covering thread.
Left
needle
Left
needle
Incorrect Correct