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Outline of
Mechanism
Outline of Mechanism Operation of other electronic components
Start/Stop (SS) Switch . . . . . . . . . . . . . . . . . . . . . . Switch for starting and stopping the sewing machine. The machine
operates at a slow speed while the switch is being held down.
Reverse switch . . . . . . . . . . . . . . . . . . . . . . . This switch is for backtracking or ending a seam. If the switch is
pushed, it makes three to four stitches in that place and stops
automatically. If the switch is held down, it sews at a slow speed
in the reverse direction as long as the switch is held.
Raise needle switch . . . . . . . . . . . . . . . . . . . . This switch toggles the needle between the up and down positions.
Operation PCB assembly
. . . . . . . . . . . . . . . . Input for pattern selection and other conditions necessary for sewing.
BH (buttonhole) switch . . . . . . . . . . . . . . . . This switch is for detecting the forward and rear ends of the
buttonhole according to the BH presser and lever.
BH (button hole) lever switch . . . . . . . . . . . . . .
This switch detects whether the BH lever is up or down.
NP sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . This sensor detects the drive timing for the pulse motor for
zigzagging and feed, the vertical stop position for the needle. It
detects the upper shaft angle of rotation using a shutter attached
to the upper shaft and an optical sensor.
Speed sensor. . . . . . . . . . . . . . . . . . . . . . . . . This sensor detects the rotational speed of the main motor. It
detects the upper shaft rotational speed using a shutter attached
to the upper shaft and an optical sensor.
Presser switch. . . . . . . . . . . . . . . . . . . . . . . . This switch detects the vertical position of the presser foot lifter.
BW (bobbin winder) switch . . . . . . . . . . . . . When the bobbin thread is wound, this switch detects whether
the bobbin is set for winding or not.
Foot control jack. . . . . . . . . . . . . . . . . . . . . . . This is the jack for plugging in the foot controller when it is used.
LED lamp SR assy., SL assy. . . . . . . . . . . . . White LED lamps for illuminating the work space.
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