JUKI MOL-254 Engineer's Manual page 225

Optional
Trouble
Loop pull-out device fails to work.
Loop pull-out device operates slow.
Belt loop tension releasing device fails to work.
Belt loop tension releasing device operates
slow.
Needle thread breakage detector fails to work.
Cause (1)
The connector of the solenoid valve is wrong.
DIP switch is not turned ON.
Adjustment amount of the speed controller
of the cylinder is improper.
The connector of the solenoid valve is wrong.
DIP switch is not turned ON.
Data value is not inputted to the panel setting
screen "nH".
Adjustment amount of the speed controller
of the cylinder is improper.
DIP switch is not turned ON.
Cable has broken.
The thread take-up spring fails to work.
The needle cooler fails to work.
Cause (2)
Adjustment amount is improper.
The thread take-up spring has broken.
The connector of the solenoid valve is wrong.
Checking order and adjusting procedure
Connect the correct connector. VL10
Turn ON the upper DIP switch No. 4 on the right side of the operation
box panel.
Adjust the speed to the proper one.
Connect the correct connector. VL9
Turn ON the lower DIP switch No. 3 on the right side of the operation
box panel.
Input the necessary releasing amount.
Adjust the speed to the proper one.
Turn ON the upper DIP switch No. 3 on the right side of the operation
box panel.
Replace the cable.
Adjust the stroke and tension of the spring to the proper ones.
Replace the thread take-up spring.
Connect the correct connector. VL15