Brother LH4-B800E Service Manual download pdf (Page 110)

LH4-B800E

4 - 23

4. Adjustment

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

foot.

1. Loosen the set screw q, and then adjust the bobbin presser w so that it goes into the hole in the bobbin case e.

2. Loosen the nut r, and then turn the screw t to adjust so that the clearance A between the bobbin presser w and

the edge of the bed is approximately 12.5 mm.

* Turn off the power, move the lower thread trimmer cam lever y by hand in the direction of the arrow so that the

bobbin presser w is firmly pressing the bobbin, and then check that the lower thread retainer u is starting to hold

the lower thread.

If this timing is reversed, it will cause problems such as an excess trailing length of upper thread.

4-15. Adjusting the bobbin presser

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Brother LH4-B800E Service Manual Page 110