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Consumer Electronics by S. P. Bali

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SERVICING ELECTRONIC CALCULATORS

Small electronic calculators require more sophisticated troubleshooting techniques than those employed in servicing many other kinds of electronic equipment. In addition to the basic procedures used in discrete transistor circuits, calculator servicing requires some understanding of integrated circuitry and logic.

To service a defective calculator you will need a pencil-type soldering iron (30 to 40 watts at about 700°F), small screwdrivers, solder remover, sharp knife, diagonal cutters, and needle-nose pliers. A vom and oscilloscope are the only necessary pieces of test equipment, but a frequency counter can come in handy at times. Some problems can be solved with no test equipment at all or possibly a vom alone. ...

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