Nortel Meridian 1 Hardware Replacement Manual page 133

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, and 61C cable
guidelines" on page 18.)
10 Follow the steps below to disengage the module:
a. Remove the two mounting screws that secure the rear of the card
cage to the module.
b. Remove the front trim panels on each side of the card cage.
c. Remove the three mounting screws that secure the front of the
card cage to the bottom of the module.
d. Pull the card cage halfway out of the module.
11 Follow the steps below to disconnect power and ground connections
at the rear of the module:
a. Disconnect the system monitor ribbon cables to J1 and J2.
b. Disconnect the module power connectors. These are small
orange connectors plugged into the module power distribution unit
(MPDU) with AC power, or connected to each other with DC
power.
c. Disconnect the logic ground (orange) wire from the backplane
bolt.
Replacing equipment
Hardware Replacement
Page 133 of 250