Fan assembly replacement
4-3
Fan Assembly Replacement Procedure
CAUTION
Disassembling any part of the fan assembly voids the part
warranty and regulatory certifications. There are no
user-serviceable parts inside the fan assembly.
Because the cooling system relies on pressurized air, do not leave
any of the fan assembly slots empty longer than two minutes while
the switch is operating. If a fan assembly fails, leave it in the switch
until it can be replaced.
Maintain all three fan assemblies in operational condition to
provide redundancy.
Table 4-1 describes the fan status LED colors, behaviors, and actions
required, if any.
Time required
Replacing a fan assembly in the DS-4900B switch should take less
than two minutes.
1 DS-4900B 4 Fan Assembly #2
2 Nonport side 5 Fan Assembly #1
3 Fan Assembly #3
Table 4-1 Fan status LED behavior, description, and required actions
LED color and behavior Description Action required
No light Fan assembly is not receiving power. Verify that the fan FRU is seated correctly.
Steady green Fan assembly is operating normally. No action required.
Steady amber (for more
than five seconds)
Fan fault for one of the following reasons:
One or more of the fan(s) in the fan assembly has
failed
The fan FRU was disabled by the user
Verify that the fan FRU is enabled. If the fan FRU
is enabled and the FRU is faulty it should be
replaced.
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