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Brother S-7220C Instruction Manual page 59

Single needle direct drive needle feed lock stitcher with thread trimmer
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Error code
E453
・ There is a problem with the head detector unit counting data. The counting data was
initialized.
Abnormal
head
detection
counting data
E701
・ Does the power supply voltage match the control box voltage specifications?
Abnormally high
・ Is the power supply voltage abnormally high?
power supply
voltage.
・ Problem with control box.
E705
・ Is the power supply voltage abnormally low?
Abnormally low
・ Problem with control box.
power supply
voltage.
E709
・ Is the electrical equipment connector inside the control box disconnected?
Power switch ON
verification cannot
・ Problem with drive PCB.
be carried out.
E710
・ Is the electrical equipment connector inside the control box disconnected?
Motor
overcurrent.
・ 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.
・ This is displayed if there is some problem with the motor and an abnormal current is
flowing.
・ Problem with control box.
E791
・ This is displayed when there is overcurrent in any of the solenoids (thread trimming,
thread wiping, quick reverse or presser lifter).
Solenoid
overcurrent.
・ Problem with main PCB.
E901
・ DIP switch No. 4 inside the control box is set to ON.
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.
Turn the power off and then back on again.
Check that the voltage matches.
Check the power supply voltage.
Replace the control box.
Check the power supply voltage.
Replace the control box.
Press the power OFF switch, and then check that the drive PCB connector is
connected to connector P3 on the main PCB.
Replace the control box.
Press the power OFF switch, and then check that the drive PCB connector is
connected to connector P4 on the main PCB.
Press the power OFF switch, and then turn the machine pulley by hand and
check that it turns easily.
Replace the motor.
Replace the control box.
Check the resistances of the solenoids.
Replace the control box.
Press the power OFF switch and set DIP switch No. 4 to OFF.
Possible cause
S-7220C
9. TROUBLESHOOTING
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