JRC JMR-92 Series Field Service Manual page 575

Step 4 Remove the CCU from the mounting plate.
Remove the screws (M4: 4 locations) of the mounting plate and pull out the CCU from the
mounting plate.
Step 5 Remove the CCU cover.
Remove the screws (M4: 6 locations) that fasten the CCU cover and then take it out.
Chapter 4 Replacement procedure 4-354