Brother LK3-B430E Mark II Service Manual page 72

10. ELECTRIC MECHANISM
Contact failure
The connectors functions are divided into four categories. Some connectors may belong to more than one
group. Be sure to investigate another category if a problem is not found in one category.
For the details of connections, refer to the control circuit block diagram at the end of this manual.
1. Feed mechanism
• Home position is not properly detected.
• Error E-A0 is displayed.
• The work clamp does not operate.
• Error E-60 is displayed.
• Forward feed does not operate correctly.
• Error E-A0 is displayed.
• Sideways feed does not operate correctly.
• Error E-A0 is displayed.
2. Work clamp lifter and thread trimmer mechanisms
• The work clamp does not operate.
• The machine does not operate.
• The work clamp does not operate.
• Thread trimming is not performed.
• Error E-61 is displayed.
• Thread take-up lever does not operate.
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Problem
Problem
LK3-B430E Mark II
Connector No. and position
Main circuit board
Sewing
X home Y home
clamp
position position
sensor
sensor sensor
Main circuit board
Y pulse
motor
Main circuit board
X pulse
motor
Connector No. and position
Main circuit board
Control
box
Foot
switch
Main circuit board
Sewing Thread
clamp trimming
solenoid
solenoid
Main circuit board
Thread take-
up solenoid