Adjusting The Thread Breakage Detector - Brother HE-800A Service Manual

4-17. Adjusting the thread breakage detector

Touching
Section A
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1. Tighten the lever stopper (1) inside the slotted hole.
2. Loosen the screw (4), and then adjust so that the distance A at the thread guide (3) is 2 mm when the thread
breakage detector lever (2) contacts the lever stopper (1).
3. Loosen the screw (6) of the lever stopper (5), and then adjust so that the distance B at the thread guide (3) is 1
mm when the thread breakage detection lever (2) contacts the stopper (5).
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4. Loosen the screw (7), and then adjust so that the distance C at the balancer (8) is 4 mm.
5. Turn on the power and set the sewing machine to the home position. Then press the RESET key to lower the
work clamp.
6. Loosen the two screws (10), and then adjust so that the thread breakage detector sensor (9) turns on (LED
illuminates) when the distance between the thread breakage detection lever (2) and the lever stopper (1) is 1
mm.
7. When the thread guide (3) is moved to position B and then released, check that it moves smoothly back to
position A.
8. If the thread guide (3) does not move smoothly, check that the clearance between the thread breakage
detection lever (2) and the arm is 0.1 - 0.5 mm.
Section C
HE-800A
Section B
4. ADJUSTMENT
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