Nortel North American DMS-100 Instruction Manual page 225

1-210 Trouble locating and clearing procedures (continued)
Replacing a fan in a 42-in. cabinet
At the front of the CPDC
6
297-8021-544 Standard 14.02 May 2001
To remove the cooling unit fuse, pull the fuse holder straight out from the front
panel of the PDC.
Note: When you remove the fuse cartridges, 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.
Locate the cooling unit circuit breaker.
Note: The two cooling unit circuit breakers are on the front panel of the
CPDC. One circuit breaker is for the side A power feed. The other circuit
breaker is for the side B power feed. The cabinet number (recorded in step
2) is above each circuit breaker. The letters SN CU (SuperNode cooling
unit) are below each circuit breaker.
(continued)