Nortel North American DMS-100 Instruction Manual page 174

6
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Filler panel
Power cable
junction box
Filler panel
CAUTION
Possible loss of service
Make sure you remove only the cooling unit fuses before you
throw this circuit breaker. Removal of the wrong fuses can
disconnect power to a critical hardware component and cause
loss of service.
Throw the circuit breaker 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.
Replacing a cooling unit fan
CPC A0345301
Frame
supervisory panel
Power distribution shelf
(breaker panel assembly)
Supplemental power dis-
tribution shelf
1-159
(continued)