Trouble locating and clearing procedures (continued) 1-59
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Repairing and replacing NT3X90AA cooling units
(continued)
Note: A FAN FAIL lamp that turns OFF when you disconnect the wiring to
the sensor indicates a sensor switch that has faults.
35
Remove the sensor switch.
36
Attach the replacement sensor switch to the switch bracket. Secure the
switch in position with screws, nuts, and washers.
37
Reconnect the wiring to the sensor switch, as noted in step 34.
38
Repeat steps 34 to 37 to check all sensor switches.
At the PDC frame
39
Remove the fuses that power the inverters.
40
Do you have a blown fuse?
did not remain on when you dis-
connected the wiring to the air
flow sensor
step 35
If the FAN FAIL lamp
Do
is off
step 62
is on
step 85
DANGER
Possible arcing
Electricity can arc when you remove cooling unit fuses. Wear
eye protection.
If a fuse
Do
is blown
step 41
is not blown
step 44
If the FAN FAIL lamp
Do