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No. Description of error detected Cause of occurrence expected Items to be checked
E303 Semicircular plate sensor
error
• Semicircular plate sensor signal cannot be
detected.
• Check whether the machine head
corresponds with the machine type setting.
• Check whether the motor encoder connector
is disconnected.
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
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-920 of 100V
specications.
• JUS : 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.
• JUS : 120V is applied to 220V box
• Inner circuit is broken by the applied
overvoltage
• 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
resistance is broken.
E906 Operation panel transmission
failure
• Disconnection of operation panel cord
• Operation panel has broken.
• Check the operation panel connector
(CN34, CN35) 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.
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