NEC SV8500 Operation And Maintenance Manual - page 629
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CHAPTER 5
Operation Procedure for System with PIR
STEP 2: Remove the front cover of the rack (PIR/TSWR) located just below the FANU.
STEP 3: Remove the front cover of FANU for the FANC to be replaced.
STEP 4: Turn OFF (upper) the FAN Power Switch.
Front Cover
FANU
a rack located just below the FANU
(PIR/TSWR)
PIR/TSWR
FANU Front Cover
FANC