Nortel North American DMS-100 Instruction Manual page 185

1-170 Trouble locating and clearing procedures (continued)
Replacing a cooling unit fan
CPC A0381714, A0382103, A0383325
At the front of the cabinet
7
8
9
297-8021-544 Standard 14.02 May 2001
CAUTION
Possible loss of service
Make sure that you remove only the cooling unit fuses before
you throw the circuit breakers. Removal of the wrong fuses
can disconnect power to a critical hardware component and
cause loss of service.
Throw the circuit breaker for the cooling unit.
Note: When you throw the circuit breakers, you remove power from the
cooling unit. Removal of power from the cooling unit can cause 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.
The cooling unit cover is at the bottom of the cabinet. To remove the cover,
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 this
document shows the location of the screws.
Slide the fan that has faults out of the cabinet so that you can disconnect the
four-pin electrical connector of the fan.
(continued)
Cooling unit
cover
Screw (nine)