Brother PS-53, Service Manual

Page: 55 / 77

-53-
22. BUTTON HOLE STITCH LEFT REVERSE STITCH AND RIGHT FORWARD
STITCH LENGTH
STANDARD
When the feed dial is in the F position, the left reverse stitch and right forward stitch length must be the same.
ADJUSTMENT
1. Set the feed dial to F position.
2. Check the difference between the left reverse stitch and right forward stitch length.
(For the PS53, turn the selection dial and set the pattern display to "b" and "d".) Check the difference
between the left reverse stitch length and right forward stitch length.
3. Loosen the BHF adjustment screw nut.
4. Turn the BHF adjustment screw so that the difference between the left reverse stitches and right forward
stitches does not stand out.
5. Tighten the BHF adjustment screw nut.
Adjustment Points
3. When adjusting using a box driver as shown in the figure, since the selection dial interferes slightly with
the box driver, remove the selection dial screw and the selection dial beforehand.
4. Turning the adjustment screw to the left makes the left reverse stitches finer; turning it to the right makes
them larger. Also, check that the alignment mark for the BH fine adjustment knob is facing straight up.
5. When fastening the adjustment screw with the nut, in order to maintain the position and prevent deviation,
hold the adjustment screw with the screwdriver while you tighten down the nut.
* Note that unless the 19. SUPER PATTERN is completed before the BH left reverse stitch and right
reverse stitch length adjustment, the BH left reverse stitch and right reverse stitch length adjustment will
need to be repeated.
(PS53)
BH fine adjustment screw
Button hole stitch fine
adjustment screw
(STAR240E)
(STAR230E)
(PS57)
(PS55)
Alignment mark
(PS53)
(PS53)
+
(STAR240E)
(STAR230E)
(PS57)
(PS55)
www.promelectroavtomat.ru