1-62 Trouble locating and clearing procedures (continued)
297-8021-544 Standard 14.02 May 2001
Repairing and replacing NT3X90AA cooling units
(continued)
68
Reinstall the air intake grill and filter assembly at the at the front of the cooling
unit.
69
Turn OFF the FAN FAIL OVERRIDE switch on the FSP.
70
Go to step 86.
At the PDC frame
71
Remove the fuses that power the inverter cards on the cooling unit that
requires replacement.
At the back of the cooling unit
72
Disconnect the plug that connects the wiring to the cooling unit.
At the front of the cooling unit
73
Remove the screws that secure the side rail covers to the frame.
74
Remove the eight screws that secure the brackets to the sides of the cooling
unit. To remove the screws, use a 5/16-inch ratchet and extension.
75
Ease the cooling unit toward you and out of the frame.
76
Ease the replacement cooling unit into the frame.
77
Insert the eight screws that secure the brackets to the sides of the cooling
unit. To insert the Use a 5/16-inch ratchet and extension.
78
Reinstall the side rail on the front of the frame.
At the back of the cooling unit
79
Reconnect the plug that connects the wiring to the cooling unit.
At the PDC frame
80
Reinstall the fuses that power the inverter cards.
At the front of the cooling unit
81
Locate the toggle switches near the back right side of the inverter cards.
82
Ensure that you turn ON the toggle switches.
83
Reinstall the air intake grill and filter assembly at the at the front of the cooling
unit.
84
Turn OFF the FAN FAIL OVERRIDE switch (or switches) on the FSP (or
FSPs).
85
WARNING
Loss of frame cooling
Do not leave a cooling unit that has faults in the frame. If you
cannot repair the cooling unit immediately, go to step 71.
Follow the necessary parts of the procedure to replace the
unit with one that work correctly.
