Nortel North American DMS-100 Instruction Manual page 163

1-148 Trouble locating and clearing procedures (continued)
Replacing a cooling unit electronic module
CPC A0383326, A0383327, A0383984
At the front of the CPDC
6
297-8021-544 Standard 14.02 May 2001
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 can cause the fan
failure lamp to turn ON. The fan failure lamp is at the top of the cabinet
between the doors.
Locate the circuit breakers 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 circuit breaker. The letters SN CU (SuperNode cooling
unit) are below each circuit breaker.
(continued)
Fuse cartridge