The Needle Bar Does Not Move Normally - Brother PR600II Service Manual

Failure Investigation for Electronic Parts The needle bar does not move normally.

The needle bar does not move normally.

Is the color change sensor's lead properly
connected to connecter CN12 on the main PCB?
Is the index sensor's lead properly connected
to connecter CN22 on the main PCB?
Is the index motor's lead properly connected
to connector CN4 on the main PCB?
Does the voltage between pins 1 and 3 of
connector CN12 on the main PCB vary from
0 to 3V at each needle bar position when
the index motor's gear is rotated by hand?
Does the voltage between pins 1 and 3 of connector
CN22 on the main PCB vary from 0V at the position of
the 1st needle bar to 3V at the position of the 2nd needle
bar when the index motor's gear is rotated by hand?
Is the resistance between pins 1 and 2,
and 3 and 4 of the index motor 4.7 - 5.7Ω,
respectively, when the motor's connector
(CN4) is removed from the main PCB?
5 - 8
Y
Y
Y
Y
Y
Y
Change main PCB.
N
Connect it properly.
N
Connect it properly.
N
Connect it properly.
N
Change color change
sensor.
N
Change index sensor.
N
Change index motor.