NEC Express 5800 User Manual page 195

7. Pull out the cooling fan upward and unmount it while marinating the same condition
as step 6.
IMPORTANT:
● A cooling fan can be replaced online (DC ON). Removing one
cooling fan causes another cooling fan to rotate at a high speed. It
retunes to normal rotation when a cooling fan is mounted to a slot
where the failed cooling fan was unmounted.
● Unmount a cooling fan while the top cover is closed.
● Do not unmount 2 cooling fans at the same time.
● Replace a cooling fan (from the time to unmount and mount the fan
within 60 seconds. If the time exceeds 60 seconds, abnormal
temperature may be detected, which may cause shutdown.
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Hardware