JRC JMR-92 Series Field Service Manual page 241

Step 2 Remove the motor driver circuit board.
Remove the cover on the right (starboard) side and loosen the four screws (M4) to remove the
drive unit, which has the motor driver circuit board on its rear side. Remove the cables connected
from the motor to the motor driver circuit board and the cables and four screws connected to the
driver circuit to replace the driver circuit board with a new one.
Driver unit (driver circuit
board at the back side)
Driver circuit board
Remove the four screws.
4-21
Remove the four screws.
Voltage specification
is indicated here.
Chapter 4 Replacement procedure