Embroidery Unit Does Not Operate Normally - Brother NV4000D Service Manual

Failure Investigation for Electronic Parts Embroidery unit does not operate normally
Embroidery unit does not operate
normally
Is the resistance across pins 1-2
and pins 3-4 for the X pulse motor
connector 4-6 Ω?
Is the resistance across pins 1-2
and pins 3-4 for the Y pulse motor
connector 4-6 Ω?
Are the motor and sensor connectors
inside the embroidery unit correctly
connected?
Is the main body lead wire assy.
correctly connected to the main
PCB assy.?
Is the resistance between pin 1 (CN3) & pin 8
(CN1), pin 2 (CN3) & pin 7 (CN1), pin 3 (CN3)
& pin 6 (CN1), pin 4 (CN3) & pin 5 (CN1), pin
1 (CN4) & pin 4 (CN1), pin 2 (CN4) & pin 3
(CN1), pin 3 (CN4) & pin 2 (CN1), pin 4 (CN4)
& pin 1 (CN1), pin 2 (CN7) & pin 4 (CN5), and
pin 2 (CN8) & pin 3 (CN5) on the embroidery
relay PCB assembly 1 Ω or less?
Y
Y
Y
Y
Y
To next page
N
Replace pulse motor
N
Replace pulse motor
N
Reconnect the connector
correctly
Reconnect the main body
N
lead wire assy. to the main
PCB assy. correctly
N
Replace the embroidery
relay PCB assembly.
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