Brother T-8422C Instruction Manual page 91

Error code
E150 ・ This is displayed when the motor becomes abnormally hot and the temperature
protection has activated.
Motor is
overheating.
E151 ・ Is the connector inside the motor disconnected?
Problem with
・ Malfunction of motor overheating sensor
motor
overheating
sensor.
E190
・ This appears on the display when the sewing machine has been operating
continuously for 3 minutes or more.
Motor timeout.
E191
・ This is displayed if the sewing machine motor locks during thread trimming.
Thread trimming
solenoid timeout.
E410
・ Is the 12-pin operation panel connector inside the control box disconnected?
Error
communicating
with operation
panel.
E440
・ Problem with main PCB.
Error writing data
to main PCB.
E441 ・ Problem with main PCB.
Error reading data
from main PCB.
E442 ・ The data on the main PCB is corrupted. Corrupt data was initalized.
Problem with data
on main PCB.
E450
・ Model selection could not be loaded from the head detector unit.
E451 ・ Problem with head detector unit.
Error writing data
to head detector
unit.
E452
・ Is the 6-pin head detector unit connector inside the control box disconnected?
Head detector unit
connection error.
After the temperature has dropped, press the power ON switch and operate the
sewing machine as normal.
Insert the connector securely.
Replace the motor.
Turn the power switch off and then back on again, and then operate the sewing
machine normally.
Remove any thread scraps that may be blocking the motor.
Check that there are no problems with the thread trimming mechanism.
Press the power OFF switch, and then check that the 12-pin operation panel
connector is connected to connector P7 on the main PCB.
Replace the control box.
Replace the control box.
Turn the power off and then back on again.
Check that the head detector unit specifications are correct.
Replace the head detector unit.
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.
T-8421C, 8422C, 8452C, 8722C, 8752C
Possible cause
14. TROUBLESHOOTING
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