Dell 2200 User Manual

Also see for Dimension 2200: Installation instructions Owner's manual Owner's manual Replacement guide Service manual

Contents

C-4 Dell PowerEdge 2200 Systems User’s GuideAltitudeOperating a system at high altitude (low pressure)reduces the efficiency of forced and convection coolingand can result in electrical problems related to arcing andcorona effects. This condition can also cause sealed com-ponents with internal pressure, such as electrolyticcapacitors, to fail or perform at reduced efficiency.Each Dell system is rated to operate at altitudes from –16to 3048 meters (m) (–50 to 10,000 feet [ft]) and can bestored at altitudes of –16 to 10,600 m (–50 to 35,000 ft).Dust and ParticlesA clean operating environment can greatly reduce thenegative effects of dust and other particles, which act asinsulators and interfere with the operation of a system’smechanical components. Also, in addition to regularcleaning, you should follow these guidelines to deter con-tamination of the computer equipment:• Do not permit smoking anywhere near the system.• Do not permit food or drink near the system.• Use dust covers when the system is not in use.• Keep 5.25-inch diskettes in their paper sleeves, andkeep all diskettes in a closed diskette box when notin use.• Close windows and outside doors to keep out air-borne particles.CorrosionThe oil from a person’s fingers or prolonged exposure tohigh temperature or humidity can corrode the gold-platededge connectors and pin connectors on various devices inthe computer. This corrosion on computer connectors is agradual process that can eventually lead to intermittentfailures of electrical circuits.To prevent corrosion, you should avoid touching contactson boards and cards. Protecting the system from corro-sive elements is especially important in moist and saltyenvironments, which tend to promote corrosion. Also, asa further deterrent to corrosion, the system should not beused in extreme temperatures, as explained in “Tempera-ture” found earlier in this appendix.ESDESD results from the buildup of static electricity on thehuman body and certain other objects. This static elec-tricity is often produced by simple movements such aswalking across a carpet. ESD is a discharge of a staticelectrical charge, which occurs when a person whosebody contains such a charge touches a component in thecomputer. This static discharge can cause components,especially chips, to fail. ESD is a problem particularly indry environments where the relative humidity is below50 percent. To reduce the effects of ESD, you shouldobserve the following guidelines:• When working inside the computer, wear a wristgrounding strap. If a wrist grounding strap isunavailable, touch an unpainted metal surface on thechassis periodically to neutralize any static charge.• If at all possible, stand on a concrete floor whileworking inside the computer.• Use an antistatic floor mat when working inside thecomputer.• If it is necessary to work in a carpeted area, spray thecarpet with an antistatic spray and allow it to drybefore beginning to work inside the computer.• Keep components in their antistatic packaging untilthey are installed.• Avoid wearing clothing made of wool or syntheticmaterials.Electromagnetic and Radio FrequencyInterferenceElectromagnetic interference (EMI) and radio frequencyinterference (RFI) from a computer can adversely affectdevices such as radio and television (TV) receivers oper-ating near the computer. Radio frequencies emanatingfrom a computer system can also interfere with cordlessand low-power telephones. Conversely, RFI from high-power telephones can cause spurious characters to appearon the system’s monitor screen.RFI is defined as any EMI with a frequency above10 kilohertz (kHz). This type of interference can travelfrom the computer to other devices through the alternat-ing current (AC) power cable and power source orthrough the air like transmitted radio waves. The FederalCommunications Commission (FCC) publishes specific