Nortel Meridian 1 Replacement Manual page 119

7 Follow the appropriate step below to turn off power to the module:
a With AC power, set the main circuit breaker for the column to OFF
(down) in the rear of the pedestal.
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 INCLUDING THE NETWORK GROUP IN THAT
COLUMN. Relocate essential services from this group before
proceeding.
b 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.)
8 Follow the steps below to remove all cards from the module:
a Tag and disconnect all cables to the front of the module. Tape over
the contacts to avoid grounding. Tape or tie all cables to the sides so
the working area in front of the card cage is totally clear.
b Set the ENB/DIS switch to DIS on any cards that are not already set
to disable.
c Tag the cards so they can be returned to the same slot in the
replacement card cage. Remove the cards, including the bus
terminating units (BTUs) between slots 4 and 5.
9 Follow the steps below to disconnect cables to the I/O panels and
backplane at the rear of the module:
a Tag and disconnect cables from the I/O panels.
b Remove the I/O panels and the I/O safety panel over the backplane
to access the rear backplane connectors.
c Use the P0741489 Extraction Tool to disconnect cables to the
backplane connectors. (See "Options 51C, 61C,and 81C cable
guidelines" on page 22.)
Replacing equipment
WARNING
Page 119 of 362
Hardware replacement