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S-7200C
19. TROUBLESHOOTING
161
Error code Possible cause Page
E452
Head detector unit
connection error
・ Is the 6-pin head detector unit connector inside the control box disconnected?
Press the power OFF switch, and then check that the 6-pin head detector unit
connector is connected to connector P8 on the main PCB.
150-151
Instruction
manual
E701
Abnormally high
power supply
voltage
・ Does the power supply voltage match the control box voltage specifications?
Check that the voltage matches.
・ Is the power supply voltage abnormally high?
Check the power supply voltage.
・ Problem with control box.
Replace the control box.
145
*
E705
Abnormally low
power supply
voltage
・ Is the power supply voltage abnormally low?
Check the power supply voltage.
・ Problem with control box.
Replace the control box.
*
E710
Motor
overcurrent
・ Is the electrical equipment connector inside the control box disconnected?
Press the power OFF switch, and then check that the drive PCB coupler
connector is connected to connector P4 on the main PCB.
・ This is displayed if the machine pulley moves stiffly when it is turned by hand, or if
the sewing machine locks up and an abnormal current is flowing.
Press the power OFF switch, and then turn the machine pulley by hand and
check that it turns easily.
・ This is displayed if there is some problem with the motor and an abnormal current is
flowing.
Replace the motor.
・ Problem with control box.
Replace the control box.
150-151
*
*
E791
Solenoid
overcurrent
・ This is displayed when there is overcurrent in any of the solenoids (thread trimming,
thread wiping, quick reverse or presser lifter).
Check the resistances of the solenoids.
・ Problem with main PCB.
Replace the control box.
146
*
E901
・ DIP switch No. 4 inside the control box is set to ON.
Press the power OFF switch and set DIP switch No. 4 to OFF.
57, 158
If an error code that is not listed above appears or if carrying out the specified remedy does not solve
the problem, contact the place of purchase.