5 - 10
Failure Investigation
for Electronic Parts
Main motor does not rotate
Connect it correctly.
N
Attach the upper shaft assy.
correctly.
N
Y
Y
Y
Is the main motor resistance 2-5Ω
at any rotation position?
Y
Y
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Main motor does not rotate.
Is the main motor connector connected
to the power PCB assy. (CN401)
correctly?
Is the power lead wire assy. free from
damage and connected to the main
PCB assy. and power supply PCB
assy. correctly?
Replace the main motor.
N
When press the start/stop button, reverse/reinforcement
stitch button and needle position button, does the buzzer
sound? Is "E6" displayed?
*
In case of models not equipped with the start/stop button.
When press the reverse/reinforcement stitch button, is
"E6" displayed?
Does the pulley rotate smoothly?
Connect the power lead wire
assy. correctly or replace it.
N
Replace the SSVR PCB assy.
N
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