Northern Telecom Meridian SL-1 Reference Manual page 18

3-4 Equipment replacement
2-Mb/s Remote Peripheral Equipment
Chart 3-2
Expansion QBL24 battery unit replacement
Service in the cabinet is interrupted when replacing the
St ep Pr oced ur e
1 Set the AC BRKR or the AC POWER breaker (whichever is
equipped) on the front of
the -48 V rectifier to OFF in the cabinet connected to the QBL24
battery unit being replaced.
2 Set the DC BRKR breaker on both QBL24 battery units serving the
cabinet to OFF.
3 Remove the screws securing the cover on the main QBL24 battery
unit and remove cover (Fig. 3-2).
The battery cells are capable of delivering high currents when
externally short-circuited. Caution must be used when working
near the open terminals of the batteries to ensure that the
terminals are not inadvertently short-circuited.
4 Disconnect the red and black wires from the expansion QBL24
battery unit to the front of the main QBL24 unit (Fig. 3-2).
5 From the main QBL24 unit, remove the flexible conduit and wiring
going to the expansion QBL24 unit (Fig. 3-2).
CAUTION
expansion QBL24 battery.
WARNING
—co nt in ued —
Appendix 1 to 553-2741-500