Adjusting The Cutting Depth Of The Upper Thread Scissors - Brother HE-800B Service Manual

7. ADJUSTMENT

7-12-5. Adjusting the cutting depth of the upper thread scissors

1779B
1781B
1. Turn off the power (with the feed mechanism at the home position), and then slowly move the trimmer driving arm (1)
forward until the driving arm roller (3) is at its highest position on the cam A of the upper thread trimmer lever (2). (Upper
thread trimming position)
* Using the output check code function can help with making this adjustment. If you press the panel
at check code No. 53, the presser lifter pulse motor will operate one step at a time. Refer to "3-8. Output
checking method".
2. Loosen the bolt (9), and then adjust the driving arm roller (3) so that the clearance between the stopper (7) of the upper
thread scissors assembly (6) and the opening cam bracket (8) is 0 - 0.3 mm.
Note: If the stopper (7) is adjusted so that it presses too firmly, it may cause the presser foot lifter pulse motor to go out of
step.
99
0 - 0.5 mm
HE-800B
1780B
0720D
key while operating