1-52 Trouble locating and clearing procedures (continued)
297-8021-544 Standard 14.02 May 2001
Repairing and replacing NT3X90AA cooling units
Application
Use this procedure to repair or replace NT3X90AA cooling units in the
following frames:
•
LGE, DTE, LTE and SME
•
ILGE and IDTE
•
DSNE
•
MS7E, ST6E and ST7E
•
SNPC
•
CPEI
A fault in a NT3X90AA cooling unit results from one of the following:
•
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
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.