Dell 6100 User Manual

Also see for 6100: Rack installation Supplemental guide Hardware guide Service manual Installation and troubleshooting guide

Contents

Dell 6100 User Manual Manual pdf 97 page image

Maintaining the System C-5• Use a directional outdoor TV antenna.• Attach line filters to the TV set.• Use 75-ohm coaxial cable for the TV set rather thantwin-lead antenna wire.• If interference occurs, rotate the computer or the TVset 90 degrees.MagnetismBecause they store data magnetically, diskettes and hard-disk drives are extremely susceptible to the effects ofmagnetism. Diskettes should never be stored near mag-netic sources such as the following:• Monitors• TV sets• Printers• Telephones with real bells• Fluorescent lightsShock and VibrationExcessive shock can damage the function, externalappearance, and physical structure of a system. Each Dellsystem has been designed to operate properly after with-standing a minimum of six consecutively executed shockpulses in the positive and negative x, y, and z axes. Eachshock pulse can measure up to 5 gravities (G) for up to11 milliseconds (ms). In storage, the system can with-stand shock pulses of 20 G with a velocity change of1397 millimeters (mm) per second (55 inches persecond).Excessive vibration can cause the same problems as men-tioned earlier for shock, as well as cause components tobecome loose in their sockets or connectors. Systems canbe subject to significant vibration when being transportedby vehicle or when operated in an environment withmachinery that causes vibration.Each Dell system, when operating, is designed towithstand 0.25 G (half-sine wave) at a sweep of 3 to300 hertz (Hz) for 15 minutes. In storage, the system canwithstand 0.5 G at 3 to 300 Hz for 15 minutes.Power Source InterruptionsComputer systems are especially sensitive to variationsin voltage supplied by the AC power source. Over-voltage, undervoltage, and transients (or spikes) can erasedata from memory or even cause components to fail. Toprotect against these types of problems, power cablesshould always be properly grounded and one or both ofthe following methods should be used:• Use an uninterruptible power supply (UPS) or one ofthe other power protection devices described in thefollowing section, “Power Protection Devices.”• Place the system on a dedicated power circuit (ratherthan sharing a circuit with other heavy electricalequipment). In general, do not allow the system toshare a circuit with any of the following:— Kitchen appliances— Copier machines— Air conditioners— Vacuum cleaners— Space heaters— Power tools— Teletype machines— Adding machines— Laser printers— Facsimile machines— Any other motorized equipmentBesides these appliances, the greatest threat to a system’ssupply of power are surges or blackouts caused by elec-trical storms. Whenever possible, turn off the computerand any peripherals and unplug them from their powersources during thunderstorms.If a blackout occurs—even a temporary one—while thesystem is turned on, turn off the system immediately anddisconnect it from its power source. Leaving the systemon may cause problems when the power is restored; allother appliances left on in the area can create large volt-age spikes that can damage the system.