Brother XM3700 Service Manual page 165

Adjustment
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[Confirmation]
When the pulley is turned by hand from the rear to the front, check that the needle flow from left to right is
normal. And check that the upper shaft rotation is not too heavy.
Pattern cam
Contact
Z finger
5 0.4 mm (4.6 - 5.4 mm)
Needle swing timing
[ OK ]
Starting position
of lateral motion
Needle plate
* The needle does not move to left/right direction under the needle plate.
[ NG ]
* The needle moves to left/right direction under the needle plate.
4 - 12
Pattern cam
Stopping position
of lateral motion
7 0.4 mm (6.6 - 7.4 mm)
Needle plate
Contact
Z finger