
Fan unit test failure
.................................................................................................................................................................................................................................
Overview
The procedure described below should be performed if one of the following failures
can be observed:
•
The “PWR ON” LED does not light up on the fan unit.
Procedure 1 must be used in this case.
•
Not all fans are running.
Procedure 2 must be used in this case.
•
The air flow direction is not from bottom to top.
Procedure 2 must be used in this case.
Procedure 1
Proceed as follows if the “PWR ON” LED does not light up on the fan unit:
.................................................................................................................................................................................................
1
Switch all circuit breakers on the subrack backplane (see chapter 5,
) to the
OFF
position (=“O”).
.................................................................................................................................................................................................
2
Replace all affected fan power cables between the Power Interfaces and the fan unit.
Make sure that the cables are tight afterwards.
.................................................................................................................................................................................................
3
Switch all circuit breakers on the subrack backplane to the
ON
position (=“I”).
IF ...
THEN ...
the “PWR ON” LED does not light
up on the fan unit,
switch all circuit breakers on the subrack
backplane to the
OFF
position (=“O”) and
replace the affected fan unit.
the “PWR ON” LED lights up on
the fan unit,
END OF STEPS
Installation troubleshooting
.................................................................................................................................................................................................................................
A-4
Lucent Technologies - Proprietary
See notice on first page
365-374-187
Issue 1, December 2005
E
N D
O F
S
T E P S
.................................................................................................................................................................................................