Repairing Consumer Electronics Without a Schematic

The need to troubleshoot and repair consumer electronics without a schematic occurs every day in the life of a busy electronics technician. The technician who repairs all types of electronic equipment must make quick and practical repairs; otherwise,

lie or she will be out of the business within a few years. It is difficult to have every schematic of the electronic product that appears upon the service bench. Remember, these technicians turn out hundreds of electronic repairs each week, month after month, without a schematic. Even the largest and best-equipped establishment cannot

have all the schematics required to service every piece of equipment that crosses the service bench. The more experienced and better informed the electronics technician is, the more productive in troubleshooting and repairing consumer electronics he or she will be. 

Of course, repairing certain types of electronic products cannot be accomplished unless a certain schematic is available. There are many repairs you can make without a circuit diagram. The tough dog and intermittent service problem are difficult to find without a schematic.

Most repair centers cannot afford every schematic on consumer equipment. Others simply do not have room for them. In addition, some schematics for import models are difficult to obtain. It might take weeks or months to get them, and the electronic product sits for days, in pieces, until the diagram arrives. Sometimes the schematic never

comes; they are no longer available.

Troubleshooting and Repairing Consumer Electronics Without a Schematic begins with servicing methods. These include locating, testing and finally repairing the electronic product. Often, none of these steps can be done without the proper equipment and components.

Heat Sink Thermal Solutions

Wakefield Engineering offers thermal solutions for management of excess heat generated by electronic components and various systems. One such example is the Pin Fin Heat Sinks (628-65ABT3)

This particular heat sink is designed for IntelDX4™, Intel 80486DX2™, and AM486™DX2, AM486™DX4

The Basics of Heat Sinks

The overall efficiency of various heat-sink types mainly depends on the following three factors:

· material.

· surface area,

· structure or shape

Cooling capabilities relate directly to the surface area; the larger the surface area, the more heat that can be dissipated. Physical structure is yet another factor. Proper structure increases turbulent airflow which creates a more competent heat sink.

The heat-sink material is also critical. Copper, for example, has excellent cooling qualities compared to aluminum because the thermal conductivity of copper is much higher than the conductivity of aluminum. At room temperature, copper has a thermal conductivity of exactly 401 W/m-K. Aluminum is 235 W/m-K. Therefore, a heat sink made of copper dissipates more significantly more heat than a heat sink made from aluminum.

Volumetric efficiency is a technical term that may be used to compare various heat-sink technologies is, or VE. VE is the product of thermal resistance and heat-sink volume, where thermal resistance equals temperature increase per watt (degree) C/W). Heat-sink volume equals footprint area times height.

The lower the thermal resistance, the more effective a heat sink is, and the smaller the heat sink's volume (but larger surface area) the more efficient it will be. Consequently, a low volumetric efficiency number means a more efficient heat sink.

Detailed specifications are available for closer inspection for the 628-65ABT3 heat sink .

Getting Hard to Find Motorola Parts

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