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Voltmetru condensator auto


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Pe display nu apare nimic? nici 000?

Ca sa inlocuiesti microcontrolerul (daca il gasesti) trebuie reprogramat cu codul original.

 

Verifica totusi tensiunea pe pinii VCC si RESET de la microcontroler. Alimentezi cu 12V dintr-o sursa externa ca sa poti verifica in casa.

http://www.kontest.ru/datasheet/unkn0wn/em78p156elp.pdf

 

Daca nu ii dai de cap se poate face o placa asemanatoare cu un microcontroler de uz general, adica sa faci alt circuit cu totul.

 

Bafta!

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E putin probabil sa fie un microcontroler. Mai degraba este un circuit dedicat, cum era stravechiul C520 RDG-ist. Circuitul nu poate fi inlocuit, dupa indicativ este un circuit facut la comanda pentru producatorul voltmetrului, eventual un microcontroler OTP (programabil o singura data). Asemenea voltmetre, foarte ieftine, se gasesc usor.

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