NEC HX4500 manual Precautions

Precautions

The following warnings and cautions apply throughout this chapter. Only a technically qualified person should integrate and configure the system.

The only procedure that can safely be done with the system power on is installing (or hot-swapping) an SCA drive/carrier assembly in one of the SCSI hot-swap drive cages or hot-swapping a failed power supply. For any other procedures inside the system, turn off system power and disconnect the AC power cord s.

!WARNING

Before doing the procedures in this chapter, make sure that your system is powered off and unplug all AC power cords. Failure to disconnect power before opening your system can result in personal injury and equipment damage.

System power on/off. The DC push-button on/off switch (a convex button) on the front panel DOES NOT turn off the system AC power. To remove power from system, you must unplug the AC power cords (from wall outlets or power supply).

Hazardous conditions, power supply. Hazardous voltage, current, and energy levels are present inside the power supply. There are no user serviceable parts inside it; servicing should be done by technically qualified personnel.

Hazardous conditions, devices & cables. Hazardous electrical conditions may be present on power, telephone, and communication cables. Turn off the system and disconnect the power cords, telecommunications systems, networks, and modems attached to the system before opening it. Otherwise, personal injury or equipment damage can result.

4-4 Upgrading Your System