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How to test a 4x3 keypad with 12 wires

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ahmad_abdulghany

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Assalamo alaykom ..
I got an old Keybad from Friday market here that sells every thing old but may be working .. the problem now the keybad has 4x3 buttons and 12 wires ... how can I test its operation .. please reply as soon as possible ... thank you very mcuh ..
 

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