Repairing And Replacing Nt3X90Aa Cooling Units - Nortel North American DMS-100 Instruction Manual

1-52 Trouble locating and clearing procedures (continued)

Repairing and replacing NT3X90AA cooling units

Application
Use this procedure to repair or replace NT3X90AA cooling units in the
following frames:
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A fault in a NT3X90AA cooling unit results from one of the following:
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Definition
The cooling unit provides forced air to cool the equipment and cards in the
frames.
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
LGE, DTE, LTE and SME
ILGE and IDTE
DSNE
MS7E, ST6E and ST7E
SNPC
CPEI
a dirty filter
a loose or broken wiring harness
a blown fuse for inverter on PDC frame
an inverter has faults
an air flow sensor switch has faults
a fan motor has faults