9
Printed circuit board U1
Board U1 schematic
Buttonhole sensor
Presser foot lifter switch
No connection
Thread tension motor
Zigzag motor
Relay cable (2-pin)
Printed circuit board A relay
(24-pin)
Replacing Electronic Components
Printed circuit board U1
NOTE:
Do not disconnect the connectors by pulling on cord.
To disconnect the connectors, grasp the connector, not the
cord.
To remove:
1. Remove the top cover (see page 2).
2. Disconnect the connectors. Remove the setscrews
(2 pcs.) and printed circuit board U1.
To attach:
Follow the above procedure in reverse.
LED (white)LED (Blue)
Printed circuit board
A relay (26-pin)
Needle threader motor
Bobbin winder motor
Presser foot lifter motor Thread cut detection
Setscrew
Setscrew
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