Needle Bar Height Adjustment - Brother NV4000D Service Manual

Adjustment
1. Remove the front cover, and turn the power on while pressing [SW3] and [SW4] on the main PCB assembly.
2. Press [SW4] four times (select test mode "4" and then "" when the front cover is attached) to move the needle bar
to the left base line.
3. Turn the power off.
4. Remove the 2 flat screws (M4), and then remove needle plate A from the feed base.
5. Turn the pulley by hand until the right edge of the needle is aligned with the tip of the outer rotary hook.
6. Loosen the socket set screw (CP, M4X4) securing the needle bar block.
7. Adjust the height of the needle bar so that the clearance between the top of the needle hole and the lower edge of
the outer rotary hook tip is 1.0 to 1.4 mm.
NOTE
• Make sure the needle block is straight.
8. Adjust the needle threader.
9. Attach needle plate A to the feed base with 2 M4 screws.

Needle bar height adjustment

Right edge of needle
and tip meet
1.0-1.4mm
4 - 9