JRC JMR-92 Series Field Service Manual page 560

Step 3 Remove the CCU from the display unit mount kit.
Remove all the cables being connected to the front of the CCU. Remove the screws (M5: 2
locations) of the mounting plate that fasten the CCU, pull out the CCU together with the mounting
plate, and then remove it from the display unit mount kit.
Before conducting Unit replacement work, always be sure that every
cable-tie that fastens the cable has been removed.
Replacement work without the above may lead Unit/cable breakage.
4-339 Chapter 4 Replacement procedure