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Computer Repair with Diagnostic Flowcharts
This manual for troubleshooting PC hardware problems creates a visual expert system for
diagnosing component failure and identifying conflicts.
The seventeen diagnostic flowcharts at the core of this book are intended for the intermediate
to advanced hobbyist, or the beginning technician.
PC Technician's Guide to EMI (Electromagnetic Interference)
Computers are high-speed digital devices. That means their internal signals are high-frequency
electric pulses. In 1886 the German physicist Heinrich Rudolph Hertz demonstrated that rapid
variations in electric current could be emitted into space in the form of radio waves. When
these radio waves interfere with the operation of nearby electronic devices, it's referred to
as Electromagnetic Interference or EMI.
The high-frequency digital circuitry in PC's can cause EMI that interferes with the operation
of nearby electronic devices. For this reason the Federal Communication Commission (FCC)
regulates emissions in the United States. PCs are required by the FCC to be certified as
Class B devices. This certification limits the amount of EMI that a PC can produce.
PCs can also be affected by EMI from other electronic devices. Potential sources of EMI are
any type of radio transmitter, or any device with a coil or solenoid, or transformer, such as
a doorbell, toaster ovens, electric blanket, electric bug zapper, heating pad, and may other
Radiation spreads out as it travels away from it's source. Following Newton's Inverse Square
Law the intensity of radiation drops off rapidly with distance. Therefore the main method
of protecting PC's and other electronic devices from EMI is to separate them in distance.
If the EMI from an electronic device has sufficient energy and is close enough to another
device, they will cause interfere with that device. Devices that emit EMI should be kept a
distance from PCs, peripherals and media.
More Windows Troubleshooting Articles:
• Computer Repair with Diagnostic Flowcharts
• How to Fix Windows XP Errors
• Stop Windows Freezing and System Lockups
• Windows 7 Startup Modes for Troubleshooting
• Solving Image Problems on HP Laser Printers
• Can't Unistall A Program, Now What?
• Video - Dell Laptop Motherboard Replacement Tutorial
• How to Resolve Cable, DSL, and Dialup Modem Problems
• Troubleshooting Broadband Cable Modem Problems
• Video - Exploring with Process Explorer
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Free PC Technical Support
A reader from Rockster, Illinois says, "... The book has great tips for optimum configuration, diagnosing problems, setting security,
disaster recovery, common annoyances and how to get around them. This is a great reference book
that the beginner or advance PC user will want to keep handy. There is so much information in this
book that even the die hard computer geek who thinks he/she knows everything about computers
should find something here that they didn't know and can put to good use."
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