Brother S-7300A Service Manual page 159

7. Adjust the positions of the upper and lower knife holders
so that the upper knife (10) and the lower knife (6) mesh
and the tips of both knives are aligned at the center of the
needle.
0953D
8. Tighten the screw (4) of the upper knife lever (3) to secure
the upper knife (10) in place.
*
Tighten the screw (4) gently but securely at this time so
that the upper knife lever (3) does not shift its position. As
a guide, the screw (4) should be positioned in the center
of the slot in the upper knife lever (3).
0954D
9. Turn the machine pulley while the thread trimmer solenoid
is still turned on so that the thread trimmer cam (12)
moves the thread trimmer cam roller (13) to its maximum
displacement position.
*
Make sure that the thread trimmer solenoid does not turn
off and does not return during this step.
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S-7300A
8. REPLACING PARTS
148