Error
code
Description of error Cause Item to be checked
E750 Sewing machine
stops
• In the case the optional-input safety
switch is pressed.
E811 Over-voltage
• In the case a voltage that is equal to or
more than the guaranteed voltage is
input.
• In the case a voltage of 200 V is applied
though the voltage is set to 100 V.
• In the case a voltage of 220 V is input
to the box of "JA: 120 V".
• In the case a voltage of 400 V is applied
to the box of "CE: 230 V".
• Check whether the supply voltage of
"rated supply voltage ±10 % or more"
is applied.
• Check whether the 100 V/200 V
changeover connector is set correctly.
In the above-described cases, the
power PCB has broken.
E813 Low voltage
E815 Regenerative
resistor is not
connected
• In the case the regenerative resistor is
not connected.
• Check whether the regenerative
resister is connected to the
regenerative resistor connector
(CN11).
E900 Main shaft motor
IPM overcurrent
protection
• Maloperation of the main shaft motor.
E901 Main shaft motor
IPM overload
E903 85-V power supply
fault
• In the case the 85-V voltage is not
properly output.
• Check whether the stepping motor is
faulty.
• Check the F2 fuse.
E904 24-V power supply
fault
• In the case the 24-V voltage is not
properly output.
E910 The presser motor
origin retrieval error
• In the case the presser motor has failed
to return to its origin.
• Check whether the presser setting is
correct (memory switch No. 23).
• Check whether the presser motor
origin has been correctly adjusted.
E912 Main shaft motor
speed detection
error
E915 Failure of
communication with
operation panel
• In the case communication with the
operation panel cannot be carried out.
E918 Main shaft
temperature error
• In the case the temperature of the CTL
PCB is excessively high.
E922 Main shaft control
failure
• In the case the main shaft motor is out
of control.
E924 Motor driver fault
• In the case the motor driver has broken.
E946 Machine-head
EEPROM write error
• In the case the machine head PCB is
not correctly connected.
• Check whether CN32 has loosened
or come off.
E955 Electric current
sensor error
• Main motor shaft failure.
• Electric current sensor failure.
• Check whether the main shaft motor
has short-circuited.
E961 Pitch motor deviation
error
• In the case the pitch motor fails to
operate because of an excessive load.
• Check whether the pitch motor runs
smoothly.
E962 Presser motor
deviation error
• In the case the presser fails to operate
because of an excessive load.
• Check whether the presser motor
runs smoothly.
E963 IPM temperature
error
• In the case the temperature of the CTL
PCB is excessively high.
– 69 –
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