Brother PR655 Service Manual page 240

Adjustment
[Adjustment]
1. Press [<] or [>] to select smallest needle bar of the clearance
between the top end of the hook and the top end of the needle eye.
2. Press [Manual move] and move the hook to the front of needle eye.
3. Loosen the 2 screws 1 of the base plate assy.
4. Adjust the height of the hook to move the base plate assy to up or
down.
5. Tighten the 2 screws 1 of the base plate assy to secure the base
plate assy.
6. Re-press [Manual move] to return the hook to its original position.
7. After adjusting this steps, adjust the needle threader (left/right).
*Key point
• Refer to "4-29 Needle threader (left/right)".
1
Base plate assy
Needle threader (up/down)
Screw, Pan (S/P washer)
M4X8DB
Hook
Needle eye
1
4 - 28
The clearance
between the top
end of the hook
and the top end of
the needle eye
0.1 - 0.2 mm