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No.
Description of error detected
Cause of occurrence expected Items to be checked
E220 Grease-up warning • When the predetermined number of stitches
has been reached.
• Replenish the specied places with grease
and reset.
(For the details, refer to the data of the
machine head.)
E221 Grease-up error
• When the predetermined number of stitches
has been reached and the sewing is not possi-
ble.
• Replenish the specied places with grease
and reset.
(For the details, refer to the data of the
machine head.)
E302 Fall detection switch failure
(When the safety switch
works)
• When fall detection switch is input in the state
that the power is turned ON.
• Check whether the machine head is tilted
without turning OFF the power switch
(sewing machine operation is prohibited
for safety sake).
• Check whether the fall detection switch
cord is caught in the sewing machine or
the like.
• Check whether the fall detection switch
lever is caught in something.
•
Check whether the contact of the tilt detec-
tion switch lever with the machine table is
inadequate. (The table has a dent or the
mounting location of the bed strut is too far)
E303 Semicircular plate sensor
error
• Semicircular plate sensor signal cannot be
detected.
• Check whether the machine head corre-
sponds with the machine type setting.
• Check whether the motor encoder con-
nector is disconnected.
E703 Operation panel is con-
nected to the unexpected
sewing machine. (Error of
sewing machine model)
• The operation panel and the sewing machine
model do not match in the initial communica-
tion.
• 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 inputted. • Check the motor signal connector (CN39)
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 running at
500 sti/min or more in the opposite direction
of that of rotation indication during motor is
running.
• Connection of the encoder of main shaft
motor is wrong.
• Connection for the electric power of main
shaft motor is wrong.
E808 Solenoid short circuit
• Solenoid power does not become normal volt-
age.
• 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 mo-
tion.
• 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-920 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
connector 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-920 of 200V
specications.
• JA : 120V is applied to 220V box
• Inner circuit is broken by the applied overvolt-
age
• Check whether the voltage is lower than
the rated voltage - (minus) 10% or less.
• Check whether 100V/200V changeover
connector is improperly set.
• Check whether fuse or regenerative resis-
tance is broken.
E906 Operation panel transmis-
sion failure
• Disconnection of operation panel cord
• Operation panel has broken.
• Check the operation panel connector
(CN38) for loose connection and discon-
nection.
• 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 EEP-ROM •
Data cannot be written on the EEP-ROM.
• Turn the power OFF.
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