4. ADJUSTMENT
HE-800A
82
4-4. Adjusting the work clamp home position sensor position
Be sure to make this adjustment before carrying out "4-14. Adjusting the upper thread trimming".
1. Turn on the power.
* Do not set the sewing machine to the home position.
2. Move the trimmer driving arm (1) in the direction of the arrow to move the upper thread trimmer driving link (2)
until it is stopped by the face plate.
3. Loosen the two screws (3), and then move the dog (4) by approximately 1 mm in the direction of the arrow past
position A where the work clamp sensor turns on (the work clamp sensor LED lights).
* This is the provisional position for the work clamp home position sensor. The final position is determined when
making the adjustment in "4-14-8. Adjusting the upper thread scissors opening timing".
4. Set the sewing machine to the home position, and then press the RESET key. Check that there is no impact
noise and that the motor does not go out of step when the work clamp is lowered and raised.
* If the adjustment is not correct, the work clamp may touch the upper thread trimmer driving link (2) and the
roller (6) of the driving lever (5), and this may cause the motor to go out of step.
5. After making this adjustment, carry out “4-18. Adjusting the thread tension at the tack tension control” and "4-14.
Adjusting the upper thread trimming".
4289Q
Approx. 1mm
4288Q
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