Janome AirThread 2000D Professional Service Bulletin page 92

Adjusting the Presser Foot Lifter
Micro switch
contact
When the presser foot lifter is in the UP
position, the machine should not run.

If an adjustment is needed, loosen the screw, slightly move the
micro switch set plate to the left then tighten the screw.

Safety Switch
Micro switch
Presser foot
lifter UP
contact
Presser foot
lifter DOWN
92