JUKI MOL-254 Engineer's Manual page 230

No. Phenomenon
13 Error is not displayed on the This occurs after replacing mistakenly the ROM. (Inserting ROM
operation box panel, but initial in the reverse direction, mounting different ROM, etc.)
operation fails after turning ON
the power.
14 Alarm No. [AL-45] is displayed Loop pull-out device stops before the pull-out position.
on the operation box panel
d u r i n g b e l t l o o p s u p p l y
operation.
Loop pull-out device goes over the pull-out position, collides with
the knife bracket and stops.
15 Alarm No. [AL-48] is displayed Input of the fork backward end (origin) sensor is defective when
on the operation box panel at the fork recedes.
the time of fork origin retrieval
operation.
16 Alarm No. [AL-49] is displayed Check the alarm LED on the MAIN circuit board.
on the operation box panel
immediately after turning ON 1-time flashing, motor-lock, is displayed.
the power.
2-time flashing, blown-out of fuse, is displayed.
3-time flashing, defective power voltage, is displayed.
4-time flashing, defective boosting voltage, is displayed.
5-time flashing, disconnection of encoder cable, is displayed.
6-time flashing, detection of abnormal current, is displayed.
7-time flashing, abnormal temperature, is displayed.
Detailed state
It is considered that a part of memory data is damaged (lost).
Perform initial setting of the memory data.
It is considered that the loop pull-out stepping motor has stepped out and stopped
on the way. Check whether there is any mechanical interference between the
pull-out device and some place.
It is considered that connector CN107 or CN4 is disconnected, or the cable has
broken. Correctly connect it.
It is considered that adjustment of the knife bracket sensor is defective. Perform
adjustment of the sensor.
It is considered that connector CN101 or CN12 is disconnected, or the cable has
broken. Correctly connect it.
It is considered that adjustment of the fork backward end (origin) sensor is
defective. Perform adjustment of the sensor.
It is considered that connector CN12 or connector directly attached to the sensor
is disconnected, or the cable has broken. Correctly connect it.
Move the fork by hand and remove the mechanical cause if it does not move
smoothly.
It is considered that connector CN112 or CN12 is disconnected, or the cable has
broken. Correctly connect it.
Replace F1 fuse 6.3AT mounted on the MAIN circuit board since the fuse has
blown out.
It is considered that the cause is due to the collision of the fork with some place
while operating. Check whether there is any problem.
Check the operating power and setting of the power changeover tap.
It is considered that the MAIN circuit board is damaged. Replace the circuit
board.
It is considered that connector CN20 is disconnected, or the cable has broken.
Correctly connect it.
It is considered that the MAIN circuit board is damaged. Replace the circuit
board.
It is considered that the MAIN circuit board is damaged. Replace the circuit
board.
Checking point and corrective measure Replacing part
MAIN circuit board
MAIN circuit board
Knife bracket sensor
Fork origin sensor
Fork servo motor
MAIN circuit board
Fuse
MAIN circuit board
MAIN circuit board
MAIN circuit board
MAIN circuit board
MAIN circuit board
MAIN circuit board