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E302 Fall detection switch failure When fall detection switch is inputted in the state that 1. Check whether the machine head is tilted without turning OFF the power switch (sewing
(When safety switch works) the power is turned ON. machine operation is prohibited for safety sake).
2. Check whether the fall detection switch cord is caught in the sewing machine or the like
and has broken.
3. Check whether the fall detection switch lever is caught in something.
E303 Semilunar plate sensor error The semilunar plate sensor signal cannot be detected. 1. Check whether there is coincidence between machine head and model setup.
2. Check whether the connecting wires of the motor encoder connector are broken.
E343 Bobbin thread remaining amount sensor 1. The device is not connected when bobbin thread 1. Check whether the device is connected.
unit trouble remaining detection function is ON. 2. Check whether bobbin thread remaining amount detection connector (CN121 and CN123)
2. Failure of position sensor of the device is loosened or disconnected.
3. Failure of position solenoid of the device 3. Check whether the detection rod of AE device is returned to the proper position.
4. When the position of detection rod of AE device is 4. Check whether function setting No. 57 is wrongly set.
out of the home position. 5. Check whether cord of AE device is broken due to pinching of cord or the like by
machine head.
E703 Connection of panel which is not When panel connected to the sewing machine is Turn OFF the power
supposed the kind which is not supposed. Connect the proper panel.
E704 Inconsistency of system versions When system versions are inconsistent. Turn OFF the power.
Consist system versions with each other.
E730 Motor encoder trouble (AB phase) When the motor signal is not properly inputted. 1. Check the motor signal connector (CN38 and CN39) for loose connection and
disconnection.
2.
Check whether the motor signal cord has broken since the cord is caught in the machine head
or the like, broken since the cord is caught in the machine head or the like.
3. Check whether the inserting direction of the motor encoder connector is wrong.
E733 Reverse rotation of main shaft motor State that the sewing machine is rotating in the Turn OFF the power.
different direction from the normal rotating direction
at 500 rpm or more continues 40 times or more while
motor is running (excluding holding of needle
position).
E808 Solenoid short-circuited Normal voltage cannot be secured for the solenoid power Check whether the machine head cords are pinched by the pulley cover or the like.
supply.
E809 Holding operation error No changeover to solenoid holding operation Check whether the solenoid is generating heat.
(The relating circuit of the CTL board is broken.)
E810 Solenoid short-circuit When the short-circuited solenoid is desired to be driven. Check whether the solenoid is short-circuited.
E811 Overvoltage 1. When voltage upper than guara
nteed one is inputted
. 1. Check whether the applied power voltage is higher than the rated voltage + (plus)
2. When 200V is inputted for 100V setting. 10% or more.
3. 220V is applied to JUS : 120V box. 2. Check whether 100V/200V changeover connector is set by mistake.
4. 400V is applied to CE : 230V box. In either of the above cases, the power supply board may have been broken.
E813 Low voltage 1. When voltage lower than guaranteed one is 1. Check whether the source voltage is below -10% of the rated level.
inputted. 2. Check whether 100V/200V changeover connector is set by mistake.
2. When 100V is inputted for 200V setting. 3. Check whether the fuses have blown cut or the regenerative resistance is broken.
3. 120v is applied to JUS : 220V box.
4. Inner circuits are damaged by the overvoltage applied.
No. Description of error detected Cause Item to be checked or corrective measure
E731 Motor sensor error (UVW phase)
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