4 600W DC-Input Power Supply Replacement Instructions
Prerequisites
Prerequisites
Before you begin this installation, review the safety guidelines in this section to avoid injuring
yourself or damaging the equipment. This section also discusses ESD prevention guidelines and
provides a list of the tools that you need to perform this replacement.
Safety Guidelines
When working with any electrical equipment, the following guidelines will help to ensure your
safety and protect the equipment. This list does not include all potentially hazardous situations, so
be alert.
•
Never try to lift an object that is too heavy for you to lift safely alone.
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Keep tools and chassis components away from walk areas.
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Do not work alone if potentially hazardous conditions exist.
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Do not wear loose clothing, jewelry (including rings and chains), or other items that could get
caught in the chassis. Fasten your tie or scarf and roll up your sleeves.
•
Never install equipment that looks damaged.
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Before beginning any procedures requiring access to the chassis interior, locate the emergency
power-off switch for the room in which you are working.
•
Disconnect all power and external cables before moving a chassis.
•
Never assume that power is disconnected from a circuit; always check.
•
Do not perform any action that creates a potential hazard to people or makes the equipment
unsafe.
•
Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
In addition, use the guidelines that follow when working with any equipment that is connected to
telephone wiring or other network cabling:
•
Never install telephone wiring during a lightning storm.
•
Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
•
Never touch uninsulated telephone wires or terminals unless the telephone line is disconnected
at the network interface.
•
Use caution when installing or modifying telephone lines.
Opening the chassis and removing the power harness cover exposes the power distribution wiring
on the backplane. If the power is not shut down, the high current present on the backplane becomes
a hazard. Also, removing the cover compromises the electromagnetic interference (EMI) integrity
of the system. Therefore, always make sure that the system power switch is turned off before
removing the chassis cover panel or replacing any internal components.
