NEC Univerge sv8500 Manual page 2747

(2) When the battery is installed externally
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 BATT BOX ASSEM.
Remove the cable connected to the battery.
Replace the battery with a spare and mount it onto the BATTBOX ASSEM.
Connect the cable to the battery.
Mount the cover back onto the BATT BOX ASSEM.
Turn ON the power supply to the DRU/DAU.
Unplug the AC cord of the DRU/DAU from the AC outlet.
See if the DRU/DAU is operating on the battery.
Plug the AC cord of the DRU/DAU back into the AC outlet.
END
CHAPTER 2
VOL.3-260
TERMINAL-RELATED DEVICES