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    مهارات الكترونية:elctronic skills


    الحوت الطفشان

    المساهمات : 24
    تاريخ التسجيل : 06/03/2009

    مهارات الكترونية:elctronic skills

    مُساهمة  الحوت الطفشان في الجمعة مارس 06, 2009 12:54 am

    Electronics skill
    Electronic home entertainment equipment installers and repairers—also called service technicians—repair a variety of equipment. They may specialize in one type of product, or may be trained in many different ones. The most common products include televisions and radios, stereo components, video and audio disc players, and video cameras. They also install and repair home security systems, intercom equipment, satellite television dishes, and home theater systems, which consist of large-screen televisions and sophisticated surround-sound audio components.
    Customers usually bring small, portable equipment to repair shops for servicing. Repairers at these locations, known as bench technicians, are equipped with a full array of electronic tools and parts. When larger, less mobile equipment breaks down, customers may pay repairers to come to their homes. These repairers, known as field technicians, travel with a limited set of tools and parts, and attempt to complete the repair at the customer’s location. If the job is complex, technicians may bring defective components back to the shop for diagnosis and repair.
    When equipment breaks down, repairers check for common causes of trouble, such as dirty or defective components. Many repairs consist simply of cleaning and lubricating equipment. If routine checks do not locate the trouble, repairers may refer to schematics and manufacturers’ specifications that provide instructions on how to locate problems. Repairers use a variety of test equipment to diagnose and identify malfunctions. Multimeters detect short circuits, failed capacitors, and blown fuses by measuring voltage, current, and resistance. Color-bar and dot generators provide onscreen test patterns, signal generators test signals, and oscilloscopes and digital storage scopes measure complex waveforms produced by electronic equipment. Repairs may involve removing and replacing a failed capacitor, transistor, or fuse. Repairers use hand tools, such as pliers, screwdrivers, soldering irons, and wrenches, to replace faulty parts. They also make adjustments to equipment, such as focusing and converging the picture of a television set or balancing the audio on a surround-sound system.
    Improvements in technology have miniaturized and digitized many audio and video recording devices. Miniaturization has made repair work significantly more difficult because both the components and the acceptable tolerances are smaller. Also, components now are mounted on the surface of circuit boards, instead of plugged into slots, requiring more precise soldering when a new part is installed. Improved technologies have lowered the price of electronic home entertainment equipment to the point where customers often replace broken equipment instead of repairing it.
    Work environment. Most repairers work in well-lighted electrical repair shops. Field technicians, however, spend much time traveling in service vehicles and working in customers’ residences.
    Repairers may have to work in a variety of positions and carry heavy equipment. Although the work of repairers is comparatively safe, they must take precautions against minor burns and electric shock. Because television monitors carry high voltage even when they are turned off, repairers need to discharge the voltage before servicing such equipment.

      الوقت/التاريخ الآن هو الإثنين يوليو 16, 2018 7:30 pm