Baby Lock BL7800, Service Manual

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7. OTHER ELECTRONIC COMPONENT FUNCTIONS
Start/stop(SS) switch ........................... used to start and stop (SS) the machine. If you want to start sewing at low
speed, keep this switch depressed and start sewing.
Backstitch(BK) switch .......................... used for backstitching and lockstitching. Backstitching is performed at low
speed in the reverse direction while the switch is pressed. For lockstitching,
three stitches are made at the current needle position and then sewing stops.
Needle position (NP) switch ................ used to change the needle position either up or down.
Operation panel ................................... used to select pattern required for sewing. This simplifies the operation for
selecting the desired pattern.
Buttonhole(BH) stitch switch................ used to detect the edges of the buttonhole stitch by means of the buttonhole
stitch presser foot and lever.
Buttonhole stitch lever(BHL) switch..... used to detect whether the buttonhole stitch lever is raised or lowered.
Needle position(NP) sensor................. detects the drive timing of zigzag and feed pulse motors and detects the
(Rotation Sensor)
vertical position of the needle. Also detects the turning angle of the upper
shaft by means of a photointerruptor and shutter installed on the upper shaft.
Speed sensor ......................................
used to detect the rotation speed of the main motor.
detects the operating speed of the main motor by means of a
photointerruptor and shutter installed on the upper shaft.
Bobbin winder(BW) switch .................. used to detect whether the bobbin winder has been set when winding the
lower thread.
Presser foot(PF) switch ....................... used to detect whether the pressor foot is raised or lowered.
Foot controller jack .............................. when using the foot controller, connect it to this terminal.
Transformer......................................... used for driving the pulse motors, to illuminate the lamps and to supply
power to the electronic circuitry.
WB light (Lamp)................................... is 12V 5W.