JRC JMR-92 Series Field Service Manual page 695

If an RIF has been installed, refer to the "4.3.7.7 Replacing the Radar interface circuit: RIF
CQD-2273" and disconnect all the cables for interconnection that are being connected to the RIF.
Remove the wing screw at the right bottom corner of the JB and disconnect the ground cable.
Step 5 Remove the JB.
Among the screws (M5: 4 locations) that fasten the JB to the display unit mount kit, loosen the
upper two screws, remove the lower two screws, and then take out the JB.
Chapter 4 Replacement procedure 4-474