Nortel North American DMS-100 Instruction Manual page 218

Replacing a fan in a 28-in. frame
At the front of the frame
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DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Replacing a fan in a 28-in. frame
Turn ON the override switch for the fan alarm on the frame supervisory panel
(FSP).
Remove the filter panel at shelf 04.
To determine the fan that has faults, look from below the fan tray.
DANGER
Risk of injury
Avoid contact with the cabinet wiring to prevent risk of
electrocution.
Remove the side rails on the frame.
DANGER
Loss of frame cooling
Disconnection of the fan for an extended period of time can
cause the equipment in the frame to overheat.
Remove the four screws on each side of the cooling unit.
Turn OFF the two switches on each of the inverter cards.
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(continued)