JRC JMR-92 Series Field Service Manual page 702

Step 6 Change the sensor LAN switch unit.
Remove the screws (M3: 4 locations on the back of the rear panel) that fasten the sensor LAN
switch unit onto the rear panel and change the sensor LAN switch unit. After replacing the sensor
LAN switch unit, assemble to the original condition 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.
Connect the LAN cables to the same connection ports after replacement.
When reinstalling the two metal planks, be careful with vertical direction.
Loosen
Remove
4-481 Chapter 4 Replacement procedure