JRC JMR-92 Series Field Service Manual page 730

Step 1 Remove the monitor
Remove the monitor from the Display Unit mount kit by referring Chapter 4.
Step 2 Remove the Trackball Operation Unit
Remove the Trackball Operation Unit from the Display Unit mount kit by referring Chapter 4.
Push
②
① ①
W64: J614
It is not necessary to remove Keyboard OPU. (If it has been installed.)
4-509 Chapter 4 Replacement procedure