Brother LH4-B800E Service Manual download pdf (Page 112)

LH4-B800E

4 - 25

4. Adjustment

0.1 - 0.3 mm

0.3 - 0.5 mm

4-17. Adjusting the thread tension at the tack tension control

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 screw q, and then adjust the clearances between the tension release cam w and the tension release

pin e as shown in the illustration.

2. Press the RESET key, and check that the tension disc opening amount is 0.5—1.0 mm when the presser foot is

raised. In addition, press the RESET key once more and check that the tension discs are fully closed when the

presser foot is lowered.

4-18. Adjusting the thread tension at the zigzag tension control

Position the tension release solenoid as described in "3-5. Tension release mechanism" before carrying out this

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 screw q, and then move the tension stud bracket assembly w in and out to adjust so that the tension

disc opening amount is 0.5—1.0 mm.

* Check that the tension discs are fully closed when the power is turned off.

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Brother LH4-B800E Service Manual Page 112