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Main Motor Rotation Abnormal - Brother PE770 Service Manual

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Failure Investigation for Electronic Parts Main motor rotation abnormal
• The rotation of the main motor is unstable.
• The rotation speed does not reach maximum.
When the upper shaft pulley is slowly
turned by hand, does the voltage
between pins 6 & 1, pins 4 &1 and
pins 5 & 1 of CN7 on the motor PCB
assy. vary 0 – 5 V DC?
5 - 10
Replace the main PCB assy.
Replace the NP PCB assy.


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