JRC JMR-92 Series Field Service Manual page 562

Step 6 Remove the screws that fasten the upper base.
Remove the screws (M4: 7 locations) that fasten the upper base. Loosen the screws (M4: 4
locations) of both ends.
Step 7 Remove the upper base.
Slide the upper base to tilt and disconnect the cables. Then, remove the upper base.
4-341 Chapter 4 Replacement procedure