Nortel North American DMS-100 Instruction Manual page 173

1-158 Trouble locating and clearing procedures (continued)
Replacing a cooling unit fan
CPC A0345301
5
297-8021-544 Standard 14.02 May 2001
(continued)
To remove the cooling unit fuses, pull the fuse cartridges 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.
Fuse cartridge
Locate the cooling unit circuit breakers.
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
1) is above each breaker. The letters SN CU (SuperNode cooling unit) are
below each breaker.