Nortel North American DMS-100 Instruction Manual page 152

Replacing a cooling unit assembly in a 42-in. cabinet
CPC A0377580, A0382102, A0383322, A0383323
At the front of the CPDC
6
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
CAUTION
Possible loss of service
Remove only the cooling unit fuses. Removal of the wrong
fuses can disconnect power to a critical hardware component
and cause loss of service.
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 circuit breaker for the cooling unit.
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 breaker. The letters SN CU (SuperNode cooling unit) are
below each breaker.
1-137
(continued)