NEC HX4500, Руководство по обслуживанию и справочник, Страница: 76 / 196

4-4 Assembly and Disassembly Procedures
Precautions
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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.