5 - 6
Failure Investigation for Electronic Parts
Main motor does not turn
Adjust the upper shaft
assembly
Reconnect it correctly
Does the pulley turn easily?
Are the resistance values for the
start/stop switch, backstitching switch,
needle lifter switch normal?
• Switch resistance values
When switch is pressed ... 1Ω or less
When switch is not pressed ...
∞
N
N
N
N
Y
Is the main motor connector
correctly connected to CN1 on the
motor PCB assy.?
Y
Replace the main motor
Replace SSVR PCB assy.
Is the main motor resistance 1.5-3.5
Ω
?
Y
Y
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Main motor does not turn
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