Repairing Fan Faults On An Lcei Frame; Cooling Unit Replacement - Nortel North American DMS-100 Instruction Manual

1-36 Trouble locating and clearing procedures (continued)
Repairing FAN faults on an LCEI frame;
cooling unit replacement
Application
Use this procedure to identify and to correct faults that can cause a FAN FAIL
alarm. The alarm can occur when you install an NTBX63AA cooling unit in
an ISDN line concentrating equipment (LCEI) frame. The LCEI frame has
enhanced line concentrating module (LCME) or ISDN line concentrating
module (LCMI) modules.
A FAN FAIL fault in an LCEI frame results from one of the following:
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•
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Definition
The FAN FAIL alarm highlights problems in the frame cooling system.
Common procedures
There are no common procedures.
Action
This procedure contains a summary flowchart and a list of steps. Use the
flowchart to review the procedure. Follow the steps to perform the procedure.
297-8021-544 Standard 14.02 May 2001
a dirty filter
a blown fuse in the front panel of the cooling unit
a cooling unit has faults