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Pulse Motors Do Not Return To Starting Point - Brother NV-10A Service Manual

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Failure Investigation for Electronic Parts Pulse motors do not return to starting point
When the power is turned ON, the pulse motors do not return to the
starting point.
• Needle up: Z pulse motor return to starting point
• Needle down: F pulse motor returns to starting point
Is the connector of the Z pulse motor
correctly connected to CN8 of the main
PCB assy.?
Is the connector of the F pulse motor
correctly connected to CN10 of the main
PCB assy.?
Is the resistance between the 1 & 2 pins
and 3 & 4 pins on the pulse motor
connectors 6.7 – 7.7 Ω?
Is the voltage between pins 3 & 4 of CN5
on the main PCB assy. 30 V DC?
Regardless of needle position this
pulse motor returns to the starting point
5 - 4
Y
Y
Y
Y
Y
Attach the main PCB assy. to
the correct position of the
shutter cover
N
Reconnect it correctly
N
Reconnect it correctly
N
Replace the pulse motor
N
Replace the power supply
PCB assy.
N
Replace the main PCB assy.

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