Nortel North American DMS-100 Instruction Manual page 219

1-204 Trouble locating and clearing procedures (continued)
Replacing a fan in a 28-in. frame
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297-8021-544 Standard 14.02 May 2001
ON OFF
Toggle
switch
Inverter
card
Slide the fan tray out of the frame.
Note the positive and negative electrical connections of the fan that has faults.
Unplug the electrical connector of the fan that has faults.
Unplug the electrical connectors to each of the inverter cards.
Note the position of the fan that has faults (top and bottom, left and right).
Remove the fan.
Position the replacement fan that has faults on the fan tray with the same
position as the fan.
Screw the four bolts into the fan from the bottom of the tray.
Plug the two electrical connectors on the fan tray into the corresponding
connectors of the fan.
Plug the electrical connector on the fan that has faults.
(continued)