JUKI MF-7800D Series, Engineer'S Manual

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2-G) Needle thread guard G-1) Being used. Do not use.
2-H) Spreader H-1) Spreader thread tension is too Reduce the tension.
strong.
2-I) Needle heat I-1) Stitch skip occurs before thread Same described in page "Thread breakage by
breakage produced by needle heat. needle heat"
2-J) Looper adjustment J-1) Incorrect clearance adjustment, Refer to the standard adjustment figures.
incorrect returning amount
adjustment
2-K) Needle guard, front and K-1) Incorrect contact amount, Refer to the standard adjustment figures.
rear incorrect height
5-3) Looper does not scoop 3-A) Looper A-1) Incorrect shape of pointed end of Replace it with the genuine part.
the left needle thread. looper disables scooping a loop.
3-B) Needle B-1) Needle bend, incorrect needle Replace the needle with new one, Correct the
mounting direction, wrong needle mounting direction, Use UY128GAS.
3-C) Auxiliary thread tension C-1) Being used. Do not use nipper.
adjustment
3-D) Needle thread guide rod D-1) Height is too low. Correct height position to appropriate height.
3-E) Needle height E-1) Height is too low. Refer to standard adjustment.
3-F) Threading F-1) Incorrect threading Refer to threading diagram.
3-G) Needle guard G-1) Being used. Do not use.
3-H) Spreader H-1) Too near to the left needle Refer to the standard adjustment figures.
3-I) Needle heat I-1) Stitch skip occurs before thread Same described in page "Thread breakage by
breakage produced by needle heat. needle heat"
3-J) Looper adjustment J-1) Incorrect clearance adjustment, Refer to the standard adjustment figures.
incorrect returning amount
3-K) Needle guard, front and K-1) Incorrect contact amount, incorrect Refer to the standard adjustment figures.
rear height
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Trouble (1) Trouble (2) Cause (1) Cause (2) Corrective measures
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