Remove the key.
De-activation is the reverse of this procedure. To deactivate, rotate the key in an anti-
clockwise direction until the indicator is no longer visible in the aperture beside the key.
Power Cord Connection
Parts Check List
• Power cord to requisite local standards
Attach the power cord to the Power Supply/Cooling Modules.
Attach the power cord to the in-line IEC connector in this cord.
Switch on each Power Supply/Cooling Module. The PSU Good and AC Fail LEDs on the PSU
indicate whether AC mains power is present.
Activating the Anti-tamper Lock
A drive carrier cannot be installed if its anti-tamper lock is activated
outside the enclosure.
The power connections must always be disconnected prior to removal of
the Power Supply/Cooling module from the enclosure.
IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide