Nortel North American DMS-100 Instruction Manual page 90

Application
Use this procedure to replace NT3X90AF cooling unit components in the
following frames:
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A problem in a NT3X90AF 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.
DMS-100 Family Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Repairing and replacing NT3X90AF cooling units
LGE, DTE, LTE and SME
LGEI, DTEI, and LTEI
ILGE and IDTE
DSNE
MS6E, MS7E, ST6E and ST7E
RCE and RCEI
CPEI
a loose or broken wiring harness
a blown fuse in the front panel of the cooling unit
a fan motor has faults
Trouble locating and clearing procedures -3