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E703(*) Operation panel is connected
to the unexpected sewing
machine. (Error of sewing
machine model)
• The operation panel and the sewing
machine model do not match in the initial
communication.
• Connect the operation panel to the correct
model of the sewing machine.
E704(*) System version mismatch • The system version is different from the
correct one in the initial communication.
• Re-write the system version to the one that
can be used with the operation panel.
E730 Encoder failure • When the motor signal is not properly input-
ted.
• Check the motor signal connector (CN30) for
loose connection and disconnection.
• Check whether the motor signal cord has
broken since the cord is caught in the machine
head.
• Check whether the inserting direction of the
motor encoder connector is wrong.
E731 Motor hole sensor failure
E733 Inverse rotation of motor • This error occurs when the motor is run-
ning at 500 sti/min or more in the opposite
direction of that of rotation indication during
motor is running.
• Check whether the machine head corresponds
with the machine type setting.
• Check whether the main-shaft motor encoder
wire is connected incorrectly.
• Check whether the main-shaft motor wire for
power supply is connected incorrectly.
E799 Thread trimming operation
time-ou
• The thread trimming control operation is not
completed within the predetermined time
(within three seconds).
• Check whether the machine head actually
installed is different from the machine head
selection.
• Check whether the motor-pulley diameter
does not match its setting (effective diam-
eter).
• Check whether the belt has slackened.
E808 Solenoid short circuit • Solenoid power does not become normal
voltage.
• Check whether the machine head cord is
caught in the pulley cover or the like.
E809 Holding motion failure • Solenoid is not changed over to holding
motion.
• Check whether the solenoid is abnormally
heated. (CTL circuit board asm. Circuit is
broken.
E810 Solenoid current abnormality • Solenoid rare short-circuit. • Solenoid resistance
E811 Abnormal voltage • When voltage higher than guaranteed one
is inputted.
• 200V has been inputted to SC-922 of 100V
specications.
• JA : 220V is applied to 120V box.
• CE : 400V is applied to 230V box.
• Check whether the applied power voltage is
higher than the rated voltage + (plus) 10% or
more.
• Check whether 100V/200V changeover con-
nector is improperly set.
In the aforementioned cases, POWER p.c.b
is broken.
• When voltage lower than guaranteed one is
inputted.
• 100V has been inputted to SC-922 of 200V
specications.
• JA : 120V is applied to 220V box
• Inner circuit is broken by the applied over-
voltage
• Check whether the voltage is lower than the
rated voltage - (minus) 10% or less.
• Check whether 100V/200V changeover con-
nector is improperly set.
• Check whether fuse or regenerative resis-
tance is broken.
E906 Operation panel transmission
failure
• Disconnection of operation panel cord
• Operation panel has broken.
• Check the operation panel connector (CN38)
for loose connection and disconnection.
• Check whether the operation panel cord has
broken since the cord is caught in the machine
head.
E924
Motor driver failure • Motor driver has broken.
E942
Faulty EEPROM • Data cannot be written on the EEPROM. • Turn the power OFF.
* The error number attached with an asterisk (*) is displayed only in the case a fault occurs when the IT
panel is connected to the sewing machine.
No.
Description of error detected
Cause of occurrence expected Items to be checked
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