Brother LH4-B800E Service Manual download pdf (Page 102)

LH4-B800E

4 - 15

4. Adjustment

4-13-5. Adjusting the cutting depth of the upper thread scissors

Clearance 0--0.5 mm

Cam

1. Turn off the power (with the feed mechanism at the home position), and then slowly move the trimmer driving arm

q forward until the driving arm roller e is at its highest position on the cam of the upper thread trimmer lever w.

2. Loosen the screw r, and then adjust the driving arm roller e so that the clearance between the stopper y of the

upper thread trimmer assembly t and the opening cam bracket u is 0—0.5 mm.

* If the stopper y is adjusted so that it presses too firmly, it may cause the presser foot lifter pulse motor to go out

of step.

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Brother LH4-B800E Service Manual Page 102