Detection of a faulty chip of the KR580 series. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Detection of a faulty chip of the KR580 series. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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When we encountered a malfunction of a device assembled on the basis of KR580 series microcircuits, it was necessary to identify the faulty microcircuit from the set without unsoldering them from the board. The way out was found quite simple.

Let's assume that the microprocessor KR580IK80A was the first to be "under suspicion". We cut the printed conductors on the board, corresponding to its +5 V, +12 V and Common supply terminals, near the solder points.

We soldered a piece of hard insulated wire 40 ... 50 mm long to the outputs of a known-good specimen, similarly to a microprocessor, and, having tinned the free ends, soldered them to the same-named outputs of the "suspicious" microprocessor, except for the indicated power outputs. Power was supplied to a working microcircuit by soldering the remaining three leads to the printed conductors of the board from the outside of their cut points.

By this, we have transferred the "suspicious" microprocessor to the third - high-impedance - state, and its functions will now be performed by a serviceable one. It remains to turn on the device and test it with a special program. If the test result is positive, then the "suspicious" microprocessor can be considered faulty. After replacing a faulty chip, do not forget to repair the cut conductors of the board.

Note that the described method cannot be used to check microcircuits that do not have a third state, such as, for example, KR580VI53, KR580GF24.

Authors: A. Paslavsky, I. Ermolaev, Ust-Kamenogorsk, Kazakhstan

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