Nortel North American DMS-100 Instruction Manual page 227

1-212 Trouble locating and clearing procedures (continued)
Replacing a fan in a 42-in. cabinet
At the front of the cabinet
8
9
10
297-8021-544 Standard 14.02 May 2001
Throw the cooling unit circuit breakers.
Note: When you throw the circuit breakers, you remove power from the
cooling unit. Removal of power from the cooling unit causes the fan failure
lamp to turn ON. The fan failure lamp is at the top of the cabinet between
the doors.
Open the cabinet doors.
To remove the cooling unit cover at the bottom of the cabinet, remove the nine
mounting screws from the cover.
Note: Do not remove the four bolts that fasten the cooling unit to the
cabinet. The procedure Replacing a cooling unit assembly in a 42-in.
cabinet in this document shows the location of the screws.
Slide the fan that has faults out of the cabinet to disconnect the electrical
connector on the fan. Do not strain the wiring harness while you disconnect
the connector.
(continued)
Cooling unit
cover
Screw (nine)