Brother LH4-B800E Service Manual download pdf (Page 89)

LH4-B800E

4 - 2

4. Adjustment

18.52 mm

4-1. Adjusting the needle zigzag home position sensor position

Reference value

Needle bar

Presser bar

Needle moves

to the right

Needle moves

to the left

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

presser foot.

2. If the needle is in the center of the needle plate hole, the following adjustment is not necessary. If the needle is not

in the center of the needle plate hole, turn off the power.

3. Loosen the screw q, and then adjust the vertical position of the needle zigzag sensor assembly w.

* The adjustment required is only slight, so move the needle zigzag sensor assembly w a little bit at a time.

4. Repeat the procedure from step 1.

* After adjusting, check that the needle bar bracket e and the stopper screws r and t are not touching when

in test feed mode. If the are touching, adjust the stopper screws r and t.

If the needle bar is at its furthest zigzag position, place the stopper screws r and t against the needle bar

bracket e, and then turn then back about 1/4 of a turn. Then tighten the nuts y and u.

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Brother LH4-B800E Service Manual Page 89