JRC JMR-92 Series Field Service Manual page 556

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.
Step 3 Clean the vents in the upper part of the CCU.
Clean the vents in the upper part of the CCU with a soft dry cloth. After cleaning the vents,
reinstall the CCU by repeating the same procedure in the reverse order. Please make sure to
tighten all the screws and connect all the cables back in place.
Step 4 Checking operation
After cleaning is completed, turn ON the circuit breaker for the power supply of the display unit
and check the operation as follows.
(1) Turn ON the display unit and start the MFD application. Check that there is no problem in its
operation and processing.
This completes the cleaning of the vents of the CCU.
4-335 Chapter 4 Replacement procedure