Pulse Motor Does Not Return To Initial Position - Brother CE-5500PRW Service Manual

Failure Investigation
for Electronic Parts
When the power is turned ON, the pulse motor does not return to the initial position.
• When needle is up : Z pulse motor returns to it's initial position.
• When needle is down : F pulse motor returns to it's initial position.
When the Z pulse motor does not
return to it`s initial position, is the
resistance between pin 1 and 4, 2 and
3, 3 and 2, 4 and 1 at the ZPM lead
wire assy. 1Ω or less?
When the F pulse motor does not
return to it`s initial position, is the
resistance between pin 1 and 4, 2 and
3, 3 and 2, 4 and 1 at the FPM lead
wire assy. 1Ω or less?
5 - 8

Pulse motor does not return to initial position

Is the resistance between pin 1 and
2, 3 and 4 on the pulse motor
connector 6.7-7.7Ω?
Y
Y
Y
Replace the main PCB assy.
N
Replace the pulse motor.
N
Replace the ZPM lead wire assy.
N
Replace the FPM lead wire assy.