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Equally useful to technicians, enthusiasts, and PC students, this mammoth resource reviews the fundamentals of PCs and peripherals and features:
Including new guidance on PC standards, new information on PC newsgroups, Windows 95 shortcuts, and a variety of forms you can photocopy, the new Second Edition is your quick and dependable cure for every PC ailment.
As you can see from Figure 2-2, a typical computer monitor is not terribly complicated. Compared to notebook computers and low-profile desktop systems, the monitor assembly is spacious. This is not an accident-monitors require substantial amounts of energy for operation. Much of this energy is dissipated as heat. Extra space prevents a buildup of heat from damaging the monitor's circuitry, and heat is allowed to escape through ventilation slots in the enclosure. Another reason for ample enclosure space is to ensure ample high-voltage insulation. Some monitors generate up to 30kV during normal operation (sometimes more for very large monitors), and normal plastic-wire insulation is hardly sufficient to ensure safety. High-voltage insulation and plenty of unobstructed space keep high voltage from arcing to other circuits. The typical monitor can be broken down into five sections: the enclosure, theCRT, a CRT drive board (or video drive board), a raster drive board, and a power supply.
Monitor enclosures are built as two pieces. The front enclosure (3 on Figure 2-2) is used to mount the CRT and degaussing coil. This is bolted to a frame (12), which forms the base of the monitor. Once other circuit boards are attached to the frame, the rear enclosure (17) forms a shroud over almost all of the monitor. In most cases, the rear enclosure can be freed by removing four screws (18). A few monitor enclosures are held together by plastic latches in addition to screws. If the rear enclosure does not slide away easily, suspect the presence of snap-in latches or extra screws installed into the frame from the bottom.
Although color monitors rely on extra video circuitry to process color signals, it is the design and construction of the CRT itself (CRT in Figure 2-2) that really makes color monitors possible. The basic principles of a color CRT (Figure 2-3) are very similar to a monochrome monitor: electrons "boil" off the cathode and are accelerated toward the phosphor-coated front face by a high positive potential. Color CRTs use three cathodes and video control grids-one for each primary color. Control (brightness), screen, and focus grids serve the same purpose as they do in monochrome CRTs. The control grid regulates the overall brightness of the electron beams, the screen grid begins accelerating the electron beams toward the front screen, and the focus grid narrows the beams. Once the electron beams are focused, vertical and horizontal deflection coils (or deflection yokes) apply magnetic force to direct the beams around the screen...
Posted September 20, 2000
Posted June 25, 2000
Bigelow does an outstanding job of detailing the hardware and related issues behind PCs.He is also an online course instructor for Element K (formerly ZDU)and i have enormously enjoyed his generous documentation and expertise in the course.Was this review helpful? Yes NoThank you for your feedback. Report this reviewThank you, this review has been flagged.