1-60 Trouble locating and clearing procedures (continued)
297-8021-544 Standard 14.02 May 2001
Repairing and replacing NT3X90AA cooling units
(continued)
41
Replace the fuses in the PDC. Replace the blown fuse with a new fuse.
At the FSPs
42
Turn OFF the FAN FAIL OVERRIDE switches.
43
Go to step 86.
44
Remove the air intake grill and filter assembly from the front of both cooling
units.
45
Inspect the fans in both cooling units.
46
Locate the toggle switches at the back right corner of each inverter.
Note: The toggle switches are the ON/OFF power switches for the
inverters.
47
Cycle the toggle switches on both inverters to find the inverter that powers the
rows of fans that do not work.
Note: Each inverter powers the row of three fans. The front of the cooling
unit houses the row of fans. Each inverter also powers the row of two fans
at the back of the paired unit.
48
Identify the cooling unit with the inverter that powers the fans that do not
operate. Replace this cooling unit.
WARNING
Incorrect fuse values
Use replacement fuses of the correct rating, or damage to the
equipment may result.
If FAN FAIL lamps at the FSPs
Do
are dark
step 42
are lit
step 44
If
Do
a complete row of fans do not
work in each cooling unit
step 46
other than listed here
step 85
If company procedures
Do
direct you to do repairs
step 50
do not direct you to do repairs
step 48