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proof that a resistor is bad is when you replace it with another resistor and the equipment operates
satisfactorily.
Although you may observe problems that we have not covered specifically in this chapter, you
should have gained enough knowledge to localize and repair any problem that may occur.
Q43. What is the most important thing to remember when troubleshooting?
Q44. What is the main reason for grounding the return side of the transformer to the chassis?
Q45. What are two types of checks used in troubleshooting power supplies?
SUMMARY
In this chapter, we have presented you a basic description of the theory and operation of a basic
power supply and its components. The following summary should enhance your understanding of power
supplies.
POWER SUPPLIES are electronic circuits designed to convert ac to dc at any desired level. Almost
all power supplies are composed of four sections: transformer, rectifier, filter, and regulator.
The POWER TRANSFORMER is the input transformer for the power supply. In addition to the
high voltage, the power transformer also supplies filament voltage.
The RECTIFIER is the section of the power supply that contains the secondary windings of the
power transformer and the rectifier circuit. The rectifier uses the ability of a diode to conduct during one
half cycle of ac to convert ac to dc.
