JUKI LK-1900B/IP-420 Instruction Manual page 82

Error code Display
E730
E731
E733
E811
E813
E901
E903
E904
Description of error
Main shaft motor
encoder is defective or
lacking for phases.
When encoder of the
sewing machine motor is
abnormal.
Main motor hole sensor
is defective or position
sensor is defective.
Hole sensor or position
sensor of the sewing
machine motor is
defective.
Reverse rotation of main
shaft motor
When the sewing machine
motor rotates in the
reverse direction.
Overvoltage
When input power is more
than the specified value.
Low voltage
When input power is less
than the specified value.
Main shaft motor IPM
abnormality
When SERVO CONTROL
p. c. b. is abnormal.
Stepping motor power
abnormality
When stepping motor
power of SERVO
CONTROL p. c. b.
fluctuates more than ±
15%.
Solenoid power
abnormality
When solenoid power of
SERVO CONTROL p. c.
b. fluctuates more than ±
15%.
– 78 –
Display message How to recover
Turn OFF the
power.
Turn OFF the
power.
Turn OFF the
power.
Turn OFF the
power.
Turn OFF the
power.
Turn OFF the
power.
Turn OFF the
power.
Turn OFF the
power.
Place of
recovery