Brother Innov-is NV4000D, 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.
Needle Thread Switch . . . . . . . . . . . . . . . . . This switch is used to thread a needle automatically. Pressing
this switch moves the needle bar to the thread guide position,
and pressing it again thread the needle and then returns the
needle bar to its original position.
Raise Presser Switch . . . . . . . . . . . . . . . . . . This switch toggles the presser foot between the up and down
positions.
Touch Panel . . . . . . . . . . . . . . . . . . . . . . . . . Used to select pattern and input test mode number required for
sewing by simply touching the display on the panel. This
simplifies the oparation for selecting the desired pattern and
number.
Speed Control Lever. . . . . . . . . . . . . . . . . . . This lever detects for the speed of 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 drive timing for the pulse motor for 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 opitical 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.
Cloth Thickness Sensor . . . . . . . . . . . . . . . . This sensor detects the thickness of cloth.
Knee Lifter Sensor . . . . . . . . . . . . . . . . . . . . This sensor detects the amount of operation of knee lifter.