NEC SV8500 Operation And Maintenance Manual - page 634
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CHAPTER 5
Operation Procedure for System with PIR
Dual Power Configuration
2.7.1
Procedure for Upgrading to Dual Power Configuration
STEP 1
Unlock the blank unit.
STEP 2
Remove the blank unit.
Blank Unit with Two LOCK Keys
Power Switch
AC/DC power unit #0 AC/DC power unit #1
LOCK key
Slide the LOCK key up
to unlock the unit.
LOCK key for blank unit