Nortel North American DMS-100 Instruction Manual page 154

Replacing a cooling unit assembly in a 42-in. cabinet
CPC A0377580, A0382102, A0383322, A0383323
At the back of the cabinet
8
9
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
Ensure that you disconnect power to the cooling unit before
you throw the cooling unit breaker. If you throw the wrong
breaker, you can disconnect power to a critical hardware
component and cause loss of service.
Throw the circuit breakers 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 causes 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.
DANGER
Risk of electrocution
Do not touch the cabinet wiring. Contact with wiring can
result in electric shock.
Pull out the electrical connector of the cooling unit at the bottom of the
cabinet.
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(continued)