JUKI LK-1900AN Engineer's Manual page 105

Display Name of error
Grease replenishing
warning error
Head tilt error
Z phase detection er-
ror
Presser foot and
thread trimmer knife
position error
Needle thread clamp
position error
Encoder trouble A
Encoder trouble B
Reverse rotation of
motor
Over voltage error
Low voltage error
Motor driver trouble
Stepping motor power
source trouble
Solenoid power source
trouble
SDC circuit board
overheat
Description of error
Sewing machine has stopped since the time of
replenishing the designated places with grease
has come.
Head tilt detection switch is turned ON.
Detection of the upper dead point of the sewing
machine cannot be performed.
Presser foot and thread trimmer knife is not in
the proper position.
The needle thread clamp device is not in the
proper position.
Encoder A or B phase cannot be detected.
Encoder U, V or W phase cannot be detected. Turn OFF the power switch and check whether CN14
The motor is reversing.
Power source voltage is beyond the specified
value.
Power source voltage is short.
Error from the motor driver is detected.
Power source of the stepping motor is not out-
put.
Power source of the solenoid is not output.
Overheat of SDC circuit board
Corrective measure
Immediately perform replenishing with grease and set
memory switch No. 245 to "0" with the reset key.
The sewing machine cannot be operated with the head
tilted.Return the sewing machine head to its proper
position.
Turn OFF the power switch and check whether CN14
of SDC circuit board is disconnected or loose.
Turn OFF the power switch and check whether CN66
of INT circuit board is disconnected or loose.
Turn OFF the power switch and check whether CN65 of
INT circuit board is disconnected or loose.
Turn OFF the power switch and check whether CN14
of SDC circuit board is loose or disconnected.
of SDC circuit board is loose or disconnected.
Turn OFF the power switch and check whether cou-
pling of the main motor is loose.
Check the power source voltage.
Check the power source voltage.
Turn OFF the power switch and turn ON the power
switch again after some time.
Turn OFF the power switch and check F1 fuse of SDC
circuit board.
Turn OFF the power switch and check F2 fuse of SDC
circuit board.
Turn OFF the power switch and turn ON the power
switch again after some time.
Remarks
Refer to the item "(9)-5.
Grease-up procedures for
the specified position".
Check the cause of blown-
out of the fuse.
Check the cause of blown-
out of the fuse.