NEC Univerge sv8500 Manual page 2746

Battery Fault
(1) When the battery is mounted inside the DRU/DAU
START
On the DLI/DAI card, set the MB switch UP.
Turn OFF the power supply to the DRU/DAU.
Remove the cover of the DRU/DAU.
Remove the cable connected with BATT0 and BATT1 connectors of the DRE card in the DRU/DAU.
Loosen the three screws that are fastening the battery cover.
Lift the battery cover and remove it from battery.
Replace the battery with a spare. Place the cover onto the spare battery.
Fasten the battery cover using the three screws.
Connect the cable to BATT0 and BATT1 connectors of the DRE card.
Mount the cover back onto the DRU/DAU.
Turn ON the power supply to the DRU/DAU.
On the DLI/DAI, set the MB switch DOWN.
Unplug the AC cord of the DRU/DAU from the AC outlet.
See if the DRU/DAU is operating on the battery power.
Plug the AC cord of the DRU/DAU back into the AC outlet.
END
CHAPTER 2
VOL.3-259
TERMINAL-RELATED DEVICES