Brother LH4-B800E Service Manual download pdf (Page 111)

LH4-B800E

4 - 24

4. Adjustment

2 mm

(A)

(B)

1 mm

0.1 - 0.5 mm

4-16. Adjusting the thread breakage detector

Touching

Section (A)

Section (B)

1. Tighten the lever stopper q inside the slotted hole. Loosen the screw w, and then adjust so that the distance (A)

at the thread guide r is 2 mm when the thread breakage detector lever e and the lever stopper t are touching.

After adjusting, tighten the screw w.

2. Loosen the screw y of the lever stopper t, set so that distance (B) at the thread guide r is 1 mm, and then touch

the thread breakage detection lever e against the stopper t.

3. Loosen the screw u, and then change the position of the balancer i to adjust the balance between the thread

breakage detection lever e and the thread guide r.

4. Turn on the power and set the sewing machine to the home position. Then press the RESET key to lower the

presser foot.

5. Loosen the screw o, and then adjust so that the thread breakage detector sensor !0 turns on (LED illuminates)

when the distance between the thread breakage detection lever e and the lever stopper q is 1 mm.

* When the thread guide r is moved to position (B) and then released, check that it moves smoothly back to

position (A).

If it does not move smoothly, check that the clearance between the thread breakage detection lever e and the

arm is 0.1—0.5 mm.

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Brother LH4-B800E Service Manual Page 111