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Condition of switches and sensors
The condition of each switch and sensor is indicated as
follows.
a. BH-BackSW: Buttonhole lever switch -Rear
OFF=Neutral
ON=Lever is pulled.
b. BH-FrontSW: Buttonhole lever switch -Front
OFF=Neutral
ON=Lever is pushed.
Lower the buttonhole lever and check these switch by
pulling or pushing this lever.
c. STOP: Stop sensor
OFF=not intercepted
d. TIMING: Timing sensor
OFF=not intercepted
e. SPEED: Speed sensor
OFF=not intercepted
These sensors are intercepted by the slit plates on the
upper shaft.
Stop sensor = Stop slit,
Timing sensor = Timing slit,
Speed sensor = Speed slit
Turn the handwheel and check the response of each
sensor.
f. WinderOFF: Bobbin Winding Stop Switch
OFF=Bobbin winder stop is not pushed
(Bobbin winding is not full)
ON=Bobbin winder stop is pushed to the right
(Bobbin winding is full.)
Turn the bobbin winder spindle to the right and move
the bobbin winder stopper to the right and check this
switch.
g. WinderSTOP: Bobbin Winder Switch
OFF=Bobbin winder spindle is in right position
ON=Spindle is in left position
Move the bobbin winder spindle left or right and check
this switch.
h. LifterSW: Presser foot switch
OFF=Presser foot is lowered
ON=Presser foot is lifted
Lower or lift the presser foot lifter and check the
response of this swtich.
i. UpperThread: Upper thread sensor
OFF=Thread check spring is pulled
ON=Thread check spring is not pulled
Thread the upper thread until thread check spring
(threading route No. 4) and hold both end of thread.
Pull or release left end of thread and check the
response of this sensor.
ON=intercepted
ON=intercepted
ON=intercepted
SERVICE MANUAL
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