Page 216 of 362 Replacing equipment553-3001-520 Standard 16.00 April 20003 Remove the NT8D22 System Monitor in the rear of the pedestal. (Do notturn off the blower unit in the front of the pedestal.)Note: If this is the master system monitor, disconnect the RJ11 cablesbefore you pull the system monitor out of the pedestal.4 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.5 Disconnect cables, plugs, and wires from the rear of the module to thebackplane:a Remove the I/O safety panel by turning the screws on each side. Setthe cover aside.b Tag and disconnect all cables from the backplane to the interior ofthe I/O assembly.c Tag and disconnect all plugs, wires, and cables to the backplane.6 Remove the two mounting screws that secure the rear of the card cage tothe module.7 Remove the front cover plates on both sides of the card cage.8 Remove the three mounting screws that secure the front of the card cageto the bottom of the module. Pull the card cage out of the module.Installing equipment1 Slide the replacement card cage into position in the module. Install themounting screws at the front of the card cage.2 Replace the front cover plates on both sides of the card cage.3 Install the mounting screws at the rear of the card cage.CAUTIONIf the system monitor is not removed, the system may shut down.
