JRC JMR-92 Series Field Service Manual page 720

When removing the cables of the UPS battery, be sure to leave the battery for at least 5 min
after removing the fuse. Not doing so may cause electric shock.
Remove two screws shown in figure below if they interfere with attachment of the UPS
controller.
Step 10 Put back the rear panel and check for LED lighting.
After replacing the UPS input filter, assemble to the original condition by repeating the same
procedure in the reverse order. Put back the wiring and perform setting in the following sequence.
(i) UPS output cable
(ii) UPS power cable
(iii) UPS battery blade fuse
(iv) Set the "Bat-Select" rotary switch of the new UPS controller at "3.4."
While maintaining the OFF state of the circuit breaker for the power supply of the display unit,
turn ON the circuit breaker of the main power line and check that the LEDs of the UPS controller
turn ON/OFF as follows. For more information, refer to "4.3.9.1 Replacing the USP Input Filter:
ME-NAX-NEF/QUINT20."
4-499 Chapter 4 Replacement procedure