JUKI MOL-254 Engineer's Manual page 223

Trouble
Clamp feed cannot pull out the belt.
Belt loop cannot be clamped by folding wire.
Rear folding amount is insufficient.
Cause (1)
Position of the clamp feed rear sensor is
wrong.
Belt loop is being caught.
Heights of the folding wires are not equal.
Heights of the folding shafts are not equal.
Belt is bent.
The length is too short.
The length is too long.
Cause (2)
Protruding amount of the supply cam up/
down cylinder is improper.
Belt feed amount [BC] is small.
Position of the clamp feed front sensor is
improper.
Belt feed amount [BC] is large.
Checking order and adjusting procedure
Adjust the position of the rear sensor.
Remove the cause of being caught from the belt.
Adjust the heights of the front and rear folding shafts.
Adjust the length of engagement of the supply cam up/down cylinder
and the rod end.
Change over the belt loop cut operation. (DIP SW No. 4 on the
CPU circuit board)
Set the proper dimension.
Adjust the position of the front sensor.
Set the proper dimension.