Troubles And Corrective Measures - JUKI MB-1800 series Instruction Manual

(. TROUBLES AND CORRECTIVE MEASURES

No. TROUBLES
The machine fails
1
to sew at the start
of sewing.
2
Thread breakage
3
Buttons are not
sewn tightly.
4
Thread cannot be
trimmed.
5
Needle thread is
cut in two places.
CAUSES
Length of remaining thread is too short.
Speed is fast.
The thread tension post No. 2 fails to
release the thread at correct timing.
The needle does not enter the center of
the holes in the button.
The needle is too thick for the diameter of
the hole in the button.
The thread tension post No. 2 fails to
release the thread at correct timing.
The thread tension post No. 2 does not
give sufficient tension.
The needle does not enter the center of
the holes in the button.
The moving knife does not separate the
thread on the fabric with its separation nail.
The needle does not enter the center of
the holes in the button.
The last stitch skips.
The moving knife separation nail is too
high or too low.
The moving knife does not separate the
thread on the fabric with its separation nail.
The moving knife separation nail is too
high or too low.
CORRECTIVE MEASURES
Adjust the thread adjusting thread guide.
Use the soft-start function.
Make the thread releasing timing slightly earlier.
Adjust the position of the button clamp jaw lever
holder.
Replace the needle with a thinner one.
Make the thread releasing timing slightly earlier.
Increase the tension of the thread tension post
No. 2.
Adjust the position of the button clamp jaw lever
holder.
Adjust the position of the moving knife.
Adjust the position of the button clamp jaw lever
holder.
Adjust the looper.
Adjust the height of the thread separation nail.
Adjust the position of the moving knife.
Adjust the height of the thread separation nail.
TROUBLES AND CORRECTIVE MEASURES