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 and S pulse motor returns to starting point
• Regardless of needle position AT&C pulse motor return to starting position
Is the resistance between the 1 & 2
pins and 3 & 4 pins on the pulse
motor connectors 4 – 6 Ω?
Regardless of needle position this
pulse motor returns to the starting point
Is the voltage between pins 5 & 4 of
CN14 on the main F3D PCB assy. 26 V
DC?
Y
N
Y
Replace main F3D PCB assy.
N
Replace pulse motor
Y
Replace NP F2 PCB assy.
N
Replace power supply F
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