8
Replacing electronic components
Printed circuit board A
To remove:
1. Remove the front cover (see page 6).
2. Grasp the connector directly with your fingers and pull.
Do not pull the lead wire, as this may damage the
contact sleeve inside the connector.
Remove the setscrews.
Remove the printed circuit board A.
* Pull out the flexible cable behind the printed circuit
board A after removing the setscrews.
To attach:
1. Follow the above procedure in reverse.
Be sure that the connector post on the printed circuit
board to which it is connected.
Position the connector correctly, then push it straight
down until it locks in place.
Setscrew
Setscrew
Printed circuit
board A
DC motor (White)
Needle plate switch (White)
Drop feed switch (Brown)
Foot control / External
thread cutter jack
Power switch (White)
Printed circuit board A connection
Slide volume (White)
Printed circuit board L1 (White)
Printed circuit board L2 (Red)
(Face cover lamp)
Printed circuit board F (Black)
(Start/stop button)
Presser foot lifter switch (White)
Printed circuit board G1 (Black)
(Buttonhole sensor)
Printed circuit board G1 (Black)
(Embroidery foot detecting sensor)
Printed circuit board G1 (White)
(Thread cut detecting sensor)
Embroidery unit (White)
Thread cutter motor / Microswitch
(White)
Bobbin thread remaining sensor
(White)
Printed circuit board G2 (Black)
(Feed motor)
Bobbin winder switch (Blue)
Touch panel
Printed circuit board L2 (Black)
(Face cover lamp)
Printed circuit board P (Black)
(Upper shaft sensor )
Printed circuit board B (Black)
(USB board)
Printed circuit board G2 (White)
(Stitch width motor)
Printed circuit board G3 (Black)
(Thread tension motor)
Bobbin thread detecting
motor / microswitch (Green)
Not used