Nortel North American DMS-100 Instruction Manual page 55

Repairing FAN FAIL faults in an LCEI frame
At the front of the frame
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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;
DANGER
Next level of support
The cooling unit configuration in the frame can differ from
the following description. If you encounter an important
difference, contact your next level of support.
Determine the location of the problem LCEI frame on the switch.
Check for the lit FRAME and FAN FAIL lamps on the frame supervisory panel
(FSP).
Remove the filter and faceplate assembly NTBX6012 at the bottom of the
frame. Inspect the filter.
Determine if the FAN FAIL lamp turned off when you removed the filter.
If the FAN FAIL lamp
turned off
remained on
Note: If the FAN FAIL lamp turns off when you remove the filter,
replacement of the filter is necessary.
Slide a replacement filter and faceplate assembly NTBX6012 into the frame.
Secure the filter and faceplate in position.
Go to step 52.
Replace the filter and faceplate assembly into the bottom of the frame.
DANGER
Risk of personal injury
Electricity can arc when you remove fan unit fuses. Wear eye
protection.
cooling unit replacement
Do
step 5
step 7
1-39
(continued)