Janome AirThread 2000D Professional Service Bulletin page 87

Reinstalling Motor, Machine Socket
If it becomes necessary to replace the C board, using a hexagon nut
driver remove the 2 nuts from the machine socket unit. Disconnect

the C board terminals, then remove the C board.
Reconnect the white harness. Reconnect the terminals, tighten the
2 nuts.

Unit and C Board
87