JUKI MOL-254 Engineer's Manual page 232

No. Phenomenon
22 Alarm No. [AL-56] is displayed This occurs when the belt loop splice is being eliminated.
on the operstion box panel.
This occurs when the belt loop splice is not being eliminated.
23 Alarm No. [AL-61] is displayed Alarm occurs although the hook cover is closed.
on the operation box panel.
24 Alarm No. [AL-62] is displayed It is considered that the 1st hook unit moved to its forward end
on the operation box panel. and has stopped immediately after turning ON the power.
It is considered that the 1st hook unit has stopped while the
needle is almost aligned with the needle hole immediately after
turning ON the power.
25 Bobbin winder device fails to Error No. [AL-49] is displayed on the operation box panel.
work.
The state is that there is no error display on the operation box
panel.
Detailed state
Check the length of belt loop cut section. When the length is 200 mm or more,
make the splice length less than 200 mm. There is a possibility of maladjustment
when the length is less than 200 mm. Perform re-setting of belt loop splice detector
with the belt loop currently used.
Check whether there is any portion where a load is applied to the belt in the
route of belt loop supply. (Especially, check whether the splice section is caught
in somewhere or whether there is any slide in the feed motor gear section making
use of the step operation function.)
There is a possibility of maladjustment. Perform re-setting of belt loop splice
detector with the belt currently used.
Check whether there is any portion where a load is applied to the belt in the
route of belt loop supply. (Especially, check whether the splice section is caught
in somewhere or whether there is any slide in the feed motor gear section making
use of the step operation function.)
It is considered that connector CN103 or CN14 is disconnected, or the cable has
broken. Correctly connect it.
It is considered that the hook cover sensor or hook cover is not properly adjusted.
Perform re-adjustment.
It is considered that connector CN104 or CN14 is disconnected, or the cable has
broken. Correctly connect it.
There is a possibility of maladjustment. Perform re-adjustment of the hook move
origin sensor 1.
It is considered that connector CN14 or connector directly attached to the sensor
is disconnected, or the cable has broken. Correctly connect it.
There is a possibilty of maladjustment. Perform re-adjustment of the hook move
origin sensor 2.
In addition, check whether the sensor slit clogs with dust such as lint or the like.
Fuse of the bobbin winder device power has blown. Replace the fuse.
Check whether the switch with thermal fuse attached to the device is turned ON.
Check whether the bobbin presser is raised.
It is considered that connector CN105 or CN6 is disconnected, or the cable has
broken. Correctly connect it.
Checking point and corrective measure Replacing part
Loop thickness detector SW
MAIN circuit board
Hook cover sensor
Hook move origin sensor 1
Hook move origin sensor 2
Fuse
Bobbin winder device