Nortel North American DMS-100 Instruction Manual page 57

At the front of the frame
13
At the back of the frame
14
15
16
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Repairing FAN faults on an LCEI frame;
Slide out the line drawer above the cooling unit.
Look into the frame of the cooling unit. Note the position of any failed or slow
fans.
Note: The fault can lie in one of the front three fans, or in the air flow
sensors on the fans. If this fault occurs, you can repair the cooling unit
without the removal of the unit from the frame. If the fault lies with the two
back fans or sensors, you must remove the cooling unit. You must remove
the unit because the back fans and sensors are not available while the unit
is in the frame. Refer to your company procedures to see if you can
attempt repairs. Your company procedures can require you to replace the
unit with a new one.
Push the line drawer that you pulled out in step 13 back into position.
Do you want to repair the cooling unit while the unit is in the frame?
If you
want to repair the cooling unit
while the unit is in the frame
cooling unit replacement
Do
step 31
1-41
(continued)