Nortel Meridian 1 Replacement Manual page 212

Page 212 of 362
553-3001-520 Standard 16.00 April 2000
Replacing equipment
Due to hazardous voltage in AC-powered systems, power to the entire
column must be shut down. This shuts down all functions in the
column.
— With DC power, set the switch on the NT6D41 CE Power Supply to
OFF (down). Set the circuit breaker for just this module to OFF
(down) in the rear of the pedestal. (All other modules in the column
retain power.)
6 Remove the NT8D22 System Monitor in the rear of the pedestal. (Do not
turn off the blower unit in the front of the pedestal.)
Note: If this is the master system monitor, disconnect the RJ11 cables
before you pull the system monitor out of the pedestal.
If the system monitor is not removed, the system may shut down.
7 Remove all cards from the module:
a Tag and disconnect cables to all faceplate connectors.
b Tag cards so they can be returned to the same slot. Remove cards.
8 Disconnect cables, plugs, and wires from the rear of the module to the
backplane:
a Remove the I/O safety panel by turning the screws on each side. Set
the cover aside.
b Tag and disconnect all cables from the backplane to the interior of
the I/O assembly.
c Tag and disconnect all plugs, wires, and cables to the backplane.
9 Remove the two mounting screws that secure the rear of the card cage to
the bottom of the module.
WARNING
CAUTION