Nortel Meridian Meridian 1 Upgrade Manual page 60

Page 60 of 284 Performing the upgrade
NN43021-469 Standard 01.01 May 2007
7 Use a a 1/4" nut driver to remove the two mounting screws at the bottom
rear of the card cage. The screws secure the card cage to the module
casting. Keep the screws for use with the CP PII card cage.
CAUTION
Do not drop the mounting screws into the pedestal. Doing
so can cause serious damage.
8 Remove the front trim panels on both sides of the card cage.
9 Remove the three mounting screws that secure the front of the card cage
to the bottom of the module. Keep the screws for use with the CP PII card
cage.
10 Pull the card cage forward until it is halfway out of the module.
11 Disconnect cables, plugs, and wires from the rear of the module to the
backplane.
12 Remove the logic return (LTRN) (orange) wire from the backplane bolt.
Be careful not to drop the nut or lock washer into the pedestal. See
Figure 5 below for DC power connectors See Figure 6 on
power connectors..
13 Remove the frame ground (FGND) (green) wire from the frame ground
bolt on the module.
14 Label and disconnect the module power connectors. These are small
orange connectors plugged into the module power distribution unit
(MPDU) in an AC-powered system, or connected to each other in a
DC-powered system.
15 Label and disconnect the system monitor ribbon cables to J1 and J2.
16 Remove the Core card cage from the module.
17 Remove the power harness and reserve it for reinstallation when you
install the new NT4N40 card cage. The power harness is located at the
right rear lower corner and plugs into the rear of the power supply.
• For AC systems, relocate power harness NT8D40.
• For DC systems, relocate power harness NT7D11.
page 62 for AC