1-44 Trouble locating and clearing procedures (continued)
297-8021-544 Standard 14.02 May 2001
Repairing FAN faults on an LCEI frame;
cooling unit replacement
(continued)
32
Determine if any of the front three fans decreased in speed or failed.
Note: Determine if all fans run, and the FAN FAIL lamp on the front of the
cooling unit is on. If the fans run, and the FAN FAIL lamp is on, the
problem can be a defective air flow sensor switch.
At the front of the cooling unit
33
Remove the fuse associated with the defective fan from the front panel.
34
Disconnect the power supply wiring to the defective fan.
35
Note the position of the sensor switch on the defective fan.
36
Remove the four screws that secure the fan and the screw that secures the
sensor switch.
37
Mount the new fan. Position the fan so that air flows toward the top, as the
fan label indicates.
38
Replace the sensor switch. Secure the switch with the mounting screw.
39
Connect the power supply to the new fan.
40
Replace the fuse that you removed in step 33.
41
If necessary, repeat steps 33 to 40 for other damaged fans.
42
Inspect the sails of the air flow sensors. Adjust or replace any sails that
appear defective.
43
Disconnect the wiring from one of the sensor switches. Note which wire
connects to each terminal.
If
Do
one or more damaged fans are
present
step 33
no damaged fans are present
step 42
If the FAN FAIL lamp
Do
is off
step 48
is on
step 42
If the FAN FAIL lamp
Do
turns off
step 48
remains on
step 42
If the FAN FAIL lamp
Do
turns off
step 44