20
MODEL 520
CONNECTOR DIAGRAM
Refer to the diagram for locating the connector posts to which each connectors should be
connected.
NOTES: TO DISCONNECT THE CONNECTORS:
1. 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.
2. When disconnecting the machine socket and power transformer connectors, pull them while
pushing them toward the printed circuit board to unlock them.
NOTES: TO CONNECT THE CONNECTORS:
1. Be sure that the color of each connector corresponds to the color of the connector post on
the printed circuit board (PCB) to which it is connected.
2. Position the connector correctly, then push it straight down until it locks in place.
Slide volume
Printed circuit board "F"
Zigzag width motor
Feed motor
Lamp
Buttonhole
sensor
Upper shaft sensor
Machine socket
(Secondary)
DC motor
Power transformer
(Primary circuit)
Power transformer
(Secondary)
Machine plug
(Primary circuit)
Bobbin winder switch
