Brother LH4-B800E Service Manual download pdf (Page 115)

LH4-B800E

4 - 28

4. Adjustment

10 - 14 mm

4-23. Adjusting the needle up stop position

1. The needle up stop position is adjusted so that the index mark w on the machine pulley q is inside the mark r

on the belt cover e. If adjustment is necessary, loosen the screw t of the machine pulley q and adjust the

position of the machine pulley q. The machine pulley q stops later if it is turned clockwise, and it stops earlier if

it is turned counterclockwise.

The screw y is a screw for detecting the machine stop position, and should not be loosened.

NOTE:

If the index mark w is not inside the mark r when the sewing machine is started, error code “E-02” will be displayed.

Turn the machine pulley q to move the index mark w to the correct position and then start the sewing machine.

4-24. Adjusting the V-belt tension

1. Remove the screw, and then remove the belt cover.

2. Turn the two nuts w to adjust so that there is 10—14 mm of deflection in the V-belt q when it is pressed at the

midway point with a force of 5 N.

NOTE:

If the V-belt is too loose, or if the V-belt is stretched, the following problems could occur.

a. The stopping position may shift;

b. The needle bar may drift when the sewing machine stops;

c. An extra stitch may be sewn when the sewing machine stops;

d. An abnormal noise may be heard due to the V-belt slipping; or

e. The V-belt may become too loose and contact the cover.

If any such problems occur, adjust by following the procedure described above.

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Brother LH4-B800E Service Manual Page 115