JUKI MF-7800D Series, Руководство инженера

Страница: 151 / 165

– 147 –
5-4) Needle does not scoop 4-A) Looper A-1) Ventral shape is incorrect. Replace it with the genuine part.
the looper thread.
(Triangle stitch skip)
Middle needle Left
needle
4-B) Needle B-1) Needle bend Replace the needle with the new one.
4-C) Needle height C-1) Needle bar position is too high. Refer to the standard adjustment figures.
4-D) Threading D-1) Incorrect threading Refer to threading diagram.
4-E) Looper adjustment E-1) Incorrect clearance adjustment, Refer to the standard adjustment figures.
incorrect returning amount
4-F) Looper thread tension F-1) Tension is too weak. Increase tension.
4-G) Looper thread cam timing G-1) Looper thread cam timing is too Refer to the standard adjustment figures.
From the previous page
To the next page
Trouble (1) Trouble (2) Cause (1) Cause (2) Corrective measures
Stitch skip by middle needle
Slack of looper thread
Stitch skip by left needle
Slack of looper thread