Service manual

S-4000 BH Omron
1-46
Released 05/2010
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E - MACHINE ADJUSTMENTS
4. Barring Tension Release Sensor
The tension discs opening is controlled by sensor. To ensure the correct funtion of the tension, it is necessary
to adjust the sensor position.
a) tilt the machine head onto the rest pin
b) rotate the handwheel until the drive spring
releases the left shifter arm detent. Feeding gears
are disengaged.
c) sensor must be activated (the red LED lights)
and the tension discs are open. If incorrect, follow
the below mentioned steps:
● loosen the set screw of the sensor holder
and move the sensor so that the center of the
sensor is opposite the sensing screw .
T
ighten the set screw
● if the sensor will not activate, loosen the nut
and turn the screw clockwise until the sensor
is activated.
● lock the screw by nut
d) rotate the handwheel until the drive spring
engages with the right shifter arm detent. Sensor
must be deactivated. If incorrect, repeat the point
c).
e) check the adjustment for the second bar.
f) return the machine head back to the operating
position
5. Adjustments of the second tension
The second tension influences the tension when the bars are sewn. It is common that the tension in the bar
should be lower than the tension in the first and the second row of stitches.
If the tension in the bar is higher than the tension in the first and the second row of stitches, the first tension is
not operating, which can cause:
● stitches tightening or the fabric to bunch up during sewing
● short thread tail for sewing the next buttonhole. The next buttonhole will not be sewn at all or missing
stitches appear at the beginning of the sewing.