Error
code
Description of error Cause Item to be checked
E302 Head-tilt detection
error
(When the safety
switch operates)
• In the case the Tilt detection switch
is turned ON when the power to the
sewing machine remains ON.
• Check whether the machine head
is tilted before turning OFF the
power switch (The sewing machine
operation is prohibited for the sake of
safety.)
• Check whether the head-tilt detection
switch cord is caught under the
machine head, etc.
• For the head-tilt detection switch
cord, check the cable of the INT PCB.
E303 Meniscus sensor
error
• In the case the meniscus sensor signal
cannot be detected
• Check whether the machine head
model setting matches the actual
machine head.
• Check for a break in the motor
encoder connector.
E704 Data failure (system-
version mismatch)
• In the case the system version does not
match the machine head setting.
• Re-write the system version to the
applicable one.
E730 Encoder fault • In the case the motor signal is not input
properly.
• Check whether the motor signal
connector (CN39) has loosened or
slipped off.
• Check whether the motor signal cord
has broken by being caught under
the machine head.
• Check whether the insertion direction
of the motor encoder connector is
correct.
E731 Motor hole sensor
fault
E733 Reverse rotation of
motor
• When the motor runs at a speed of
500 sti/min. or more, the motor runs in
the reverse direction of the indicated
direction of rotation.
• Check whether the main shaft motor
encoder wire connection is correct.
• Check whether the main shaft motor
wire connection for power is correct.
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 • In the case a voltage that is equal to
or less than the guaranteed voltage is
input
• In the case a voltage of 100 V is applied
though the voltage is set to 200 V
• In he case a voltage of 120 V is input to
the box of "JUS: 220 V"
• In the case the internal circuit has
broken due to the application of over-
voltage
• Check whether the supply voltage of
"rated supply voltage -10 % or less"
is applied.
• Check whether the 100 V/200 V
changeover connector is set correctly.
In the above-described cases, the
power PCB has broken.
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).
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