Baby Lock BLMY, Service Manual

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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.
Cut thread switch . . . . . . . . . . . . . . . . . . . . . This switch is for cutting the thread. If the switch is pressed, the
thread is cut regardless of the position of the needle, and the
machine stops with the needle up.
Rubber switches . . . . . . . . . . . . . . . . . . . . . . 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
button hole 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 pulse motor drive timing for zizag, feed
and thread cutting, as well as the vertical stop position of 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.
FR assembly and FL assembly LED lamps . White LED lamps for illuminating the work space.
Speed Control lever . . . . . . . . . . . . . . . . . . . This lever detects for the speed of sewing.