JRC JMR-92 Series Field Service Manual page 235

Step 2 Remove the motor driver circuit board.
Loosen the four screws (M4) to remove the driver unit, which has the motor driver circuit board
on its back side. Disconnect the cables connecting the motor to the motor driver circuit board.
Driver unit (driver circuit
board at the back side)
Driver circuit board
Remove the four screws.
Disconnect the cables.
4-15 Chapter 4 Replacement procedure