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Description of error
No.
detected
E703(*) Operation panel is
connected to the
unexpected sewing
machine. (Error of
sewing machine mod-
el)
E704(*) System version mis-
match
E730 Encoder failure
E731 Motor hole sensor
failure
E733 Inverse rotation of
motor
E799 Thread trimming op-
eration time-out
E808 Solenoid short circuit
E809 Holding motion failure • Solenoid is not changed over to
E810 Solenoid current ab-
normality
E811
Abnormal voltage
E906 Operation panel
transmission failure
E924 Motor driver failure
E942 Faulty EEPROM
E968 Motor driver error
(inside of MC-450)
* The error number attached with an asterisk (*) is displayed only in the case a fault occurs when the IP/IT panel
is connected to the sewing machine.
Cause of occurrence expected
• The operation panel and the sewing
machine model do not match in the
initial communication.
• The system version is different from
the correct one in the initial commu-
nication.
• When the motor signal is not proper-
ly inputted.
• 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.
• The thread trimming control oper-
ation is not completed within the
predetermined time (within three
seconds).
• Solenoid power does not become
normal voltage.
holding motion.
• Solenoid rare short-circuit.
• When voltage higher than guaran-
teed one is inputted.
• 200V has been inputted to SC-921
of 100V specifications.
• JA : 220V is applied to 120V box.
• CE : 400V is applied to 230V box.
• When voltage lower than guaranteed
one is inputted.
• 100V has been inputted to SC-921
of 200V specifications.
• JA : 120V is applied to 220V box
• Inner circuit is broken by the applied
overvoltage
• Disconnection of operation panel
cord.
• Operation panel has broken.
• Motor driver has broken.
• Data cannot be written on the EE-
PROM.
• Timing to re-turn the power ON is too
early.
• Motor cable or encoder cable has
slipped off or broken.
• Failure of the motor driver
– 48 –
Items to be checked
• Connect the operation panel to the correct
model of the sewing machine.
• Re-write the system version to the one that
can be used with the operation panel.
• Check the motor signal connector (CN30) for
loose connection and disconnection.
• Check whether the motor signal cord has bro-
ken since the cord is caught in the machine
head.
• Check whether the inserting direction of the
motor encoder connector is wrong.
• Check whether the machine head corre-
sponds 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.
• 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 diameter).
• Check whether the belt has slackened.
• Check whether the machine head cord is
caught in the pulley cover or the like.
• Check whether the solenoid is abnormally
heated. (CTL circuit board asm. Circuit is bro-
ken.)
• Solenoid resistance.
• 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.
• 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.
• 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 ma-
chine head.
• Turn the power OFF.
• Wait for five more seconds and re-turn the
power ON.
• Check whether or not the following motor/
encoder cable connector has slipped off or
whether or not the cable has broken.
Motor cable connectors : MOT_3D (motor
side) - MD_CN3 (MC-450 side)
Encoder cable connectors : MOT_2D (motor
side) - MD_CN2 (MC-450 side)
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