Nortel North American DMS-100 Instruction Manual page 61

44
45
46
47
48
At the back of the frame
49
At the front of the frame
50
51
52
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;
If the FAN FAIL lamp
remains on
Note: A FAN FAIL lamp that turns off indicates a defective sensor switch.
Remove the mounting screw from the air flow sensor. Remove and replace
the sensor with a new sensor. Connect the wiring to the new sensor.
If the FAN FAIL lamp
turns off
remains on
Repeat steps 42 to 44 until you checked all three accessible sensors, or until
the FAN FAIL lamp turns off.
If the FAN FAIL lamp is
off
on
Note: If the FAN FAIL lamp remains ON, the fault can lie in the two back
fans or air flow sensors. In this event, remove the cooling unit from the
frame and replace the unit with a new unit. If your company procedures
direct you to repair damaged units in-house, refer to "Repairing a
NTBX63AA cooling unit" in this document.
Contact the next level of support.
Go to step 52.
Push the cooling unit back into the frame.
Replace the three mounting screws at the back center of the cooling unit
removed in step 12. Secure the screws in position.
Replace the four 5/16-inch bolts that secure the cooling unit brackets (two per
side) removed in step 11. Secure the bolts in position.
Reinstall the side trim and secure the trim with the top and bottom screws
removed in step 10.
The procedure is complete.
cooling unit replacement
Do
step 45
Do
step 48
step 45
Do
step 48
step 17
1-45
(end)