Nortel North American DMS-100 Instruction Manual page 171

1-156 Trouble locating and clearing procedures (continued)
Replacing a cooling unit fan
CPC A0345301
Replacing a cooling unit fan
At your current location
1
At the front of the cabinet
2
3
297-8021-544 Standard 14.02 May 2001
(continued)
Obtain a replacement for the cooling unit fan.
Record the cabinet number.
Note: The cabinet number (for example, D00) is on the front of the
cabinet, above the doors.
Consult office records or operating company personnel. Determine if power
to the cooling unit connects through a power distribution center (PDC), or a
cabinetized PDC (CPDC).
If power to the cooling unit
connects through a PDC
connects through a CPDC
Locate the cooling unit fuses.
Note: The cooling unit fuse cartridges are on the front panel of the PDC.
The fuse cartridges contain two cooling unit fuses. One fuse is for the side
A power feed. The other fuse is for the side B power feed. The cabinet
number (recorded in step 1) is above each fuse cartridge. The letters SN
CU (SuperNode cooling unit) are below each fuse cartridge.
DANGER
Risk of injury or damage to equipment
When you replace a cooling unit, do not wear jewelry (for
example, rings, bracelets, or necklaces).
WARNING
Possible equipment damage
Do not remove power to the cooling unit for more than 30
minutes. Extended removal of power can cause the unit to
overheat and cause damage.
Do
step 3
step 5