Brother PS-53, Service Manual

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4. NEEDLE DOWN POSITION ADJUSTMENT
STANDARD
The needle descent for zigzag sewing should be such that the needle descends evenly to the center of the
needle hole in the needle plate.
ADJUSTMENT
1. Turn the selection dial, set the pattern display to zigzag and turn the Zigzag dial to the maximum.
2. Turn the balance wheel, lower the needle and turn the Zigzag dial to 0. (At this time, the needle bar moves
to the right.)
3. Loosen the two screws for the Zigzag dial assembly.
4. Move the Zigzag dial assembly to position at which the needle does not move left and right even when the Z
finger is moved.
5. Tighten the two screws for the Zigzag dial assembly.
6. Turn the balance wheel through position where the Z finger mounts the peak of the pattern cam.
7. Loosen the screw holding the eccentric nut (A), turn the eccentric nut (A) with a spanner, and tighten the
eccentric nut (A) screw at a position where the needle does not moves even if the Zigzag dial is turned 0
and maximum.
8. Loosen the screw securing the eccentric nut (B), turn the balance wheel, lower the needle left and right, turn
the eccentric nut (B) with a spanner, and tighten the eccentric nut (B) screw so that the left and right needle
descent are symmetric about the center of the steel plate hole.
Eccentric nut
Eccentric nut
Zigzag dial assembly
Z finger
Pattern cam
Adjustment
range
Should be even left
and right
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