Operation Of Other Electronic Components - Brother PE770 Service Manual

Outline of Mechanism Operation of other electronic components
Start/Stop (SS) button. . . . . . . . . . . . . . . . . . Button for starting and stopping the sewing machine. The
Thread cutter button . . . . . . . . . . . . . . . . . . . This button is for cutting the thread. In case the button is
Touch Panel . . . . . . . . . . . . . . . . . . . . . . . . . Used to select pattern and input test mode number required for
Needle position (NP) sensor. . . . . . . . . . . . . This sensor detects the drive timing of each pulse motor and the
Speed sensor. . . . . . . . . . . . . . . . . . . . . . . . . This sensor detects the rotational speed of the main motor. It
PF (Presser foot) switch . . . . . . . . . . . . . . . . This switch detects the vertical position of the presser foot lever.
BW (bobbin winder) switch . . . . . . . . . . . . . This switch detects whether the bobbin is set for winding or not,
LED lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . White LED lamps for illuminating the work space.
Up thread sensor. . . . . . . . . . . . . . . . . . . . . . Detects the presence or absence of the upper thread and
Photo diode, photo transistor . . . . . . . . . . . . This assy detects the bobbin thread is low.
X sensor,
Y sensor (Embroidery unit) . . . . . . . . . . . . . This sensor detects the original position of X pulse motor and Y
1 - 6
machine operates at a slow speed while the button is being held
down.
pressed, the thread is cut regardless of the needle position and
stop with the needle up.
sewing by simply touching the display on the panel. This
simplifies the oparation for selecting the desired pattern and
number.
vertical stop of the needle position. It detects the upper shaft
angle of rotation by using a shutter attached to the upper shaft
and an opitical sensor.
detects the upper shaft rotational speed by using a shutter
attached to the upper shaft and an optical sensor.
when the bobbin thread is wound.
whetherit is cut or not.
pulse motor.