Nortel North American DMS-100 Instruction Manual page 77

Repairing and replacing NT3X90AA cooling units
49
50
At the PDC frame
51
At the frame
52
53
54
55
56
At the PDC frame
57
At the frame
58
59
At the FSP
60
61
62
63
64
At the PDC frame
65
66
67
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Go to step 71.
Turn OFF the inverter that powers the row of fans that have faults.
Remove the fuse for the inverter that powers the fans.
Disconnect the connector at the back left corner of the inverter.
Use a pair of needle-nosed pliers to remove the four plastic mounting pins
that hold the inverter card.
Lift the inverter out of the cooling unit. Replace the inverter with a new
inverter.
Mount the new inverter on the four plastic mounting pins.
Attach the connector at the back left corner of the new inverter.
Check the fuse to the inverter. A blown fuse requires a replacement. Replace
the fuse in the PDC.
Turn ON the toggle switch of the new inverter.
If
the fans work correctly and the
FAN FAIL lamp is not on
other than listed here
Install the air intake grill and filter assembly at the front of the cooling unit.
Turn OFF the FAN FAIL OVERRIDE switch (or switches).
Go to step 86.
Ease the cooling unit back completely into the frame.
Insert the eight screws that secure the brackets to the sides of the cooling
unit. To insert the screws, use a 5/16-inch ratchet and extension.
Reinstall the side rail on the front of the frame.
If you removed the fuse (or fuses) that powers the inverter card (or cards),
reinstall it.
Locate the toggle switch near the back right side of the inverter card (or
cards).
If the switches operated during this procedure, ensure that you turn back ON
the switches.
Do
step 59
step 85
1-61
(continued)