D-6 Dell Precision 610 Mini Tower Systems User’s Guide
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The oil from a perso n ’s fingers or prol onged e xposure to high temperat ure or humi dity
can corrode the gold-plated edge connectors and pin connectors on various devices in
the computer. This corrosion on computer connectors is a gradual process that can
eventually lead to intermittent failures of electrical circuits.
To prevent corrosion, you should avoid touching contacts on boards and cards. Pro-
tecting th e s yste m fro m corrosive e le men ts i s espe ci al ly imp ortant in m oi st a nd s a lty
environments, which tend to promote corrosion. Also, as a further deterrent to corro-
sion, the system should not be used in extreme temperatures, as explained in
“Temperature” found earlier in this appendix.
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ESD res ults from the build up of s tatic electr icity on the human body and ce rtain other
objects. This static electricity is often produced by simple movements such as walk-
ing acro ss a c arpet. E SD is a discharge of a s tatic elec trical cha rge that occ urs when a
person whose body contains such a charge touches a component in the computer.
This static discharge can cause components, especially chips, to fail. ESD is a prob-
lem particularly in dry environments where the relative humidity is below 50 percent.
To reduce the effects of ESD, you should observe the following guidelines:
When working inside the computer, wear a wrist grounding strap. If a wrist
grounding strap is unavailable, touch an unpainted metal surface on the chassis
periodically t o neutrali ze any stat ic charge.
If at all possible, stand on a concrete floor while working inside the computer.
Use an antistatic floor mat when working inside the computer.
If it is necessary to work in a ca rpeted area, spray the carpet with a n antistatic
spray and allow it to dry before beginning to work inside the computer.
Keep components in their antistatic packagin g until they are installed.
Avoid wearing clothing made of wool or synthetic materials.
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Electromagnetic interference (EMI) and radio frequency interference (RFI) from a
computer can adversely affect devices such as radio and television (TV) receivers
operating near the computer. Radio frequencies emanating from a computer system
can also interf ere with cordless and low -power telephones. Conversely, RFI from high-
power telephones can cause spurious characters to appear on the system’s monitor
screen.
RFI is d efin ed as a ny EMI wi th a fre que ncy abov e 10 kilohertz (kHz). This type of inte r-
ference can travel from the computer to other devices through the AC power cable
and power s ource or through the air like transm itted radio waves. The Federal Com-
munications Commission (FCC) publishes specific regulations to limit the amount of
EMI and RFI emitted by computing equipment. Each Dell system meets these FCC
regulations.