Multisim and Ultiboard

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Please help - hex decoder problem

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Hi,

I am having trouble with an assignment for a Hexidecimal decoder 7 segment display. Everthing works except when I enter binary 0010 which should display the number 2 on the 7 segment display I am getting a light on segment f. I have checked all my Karnaugh maps and gates on the multisim circuit, but cant find the error. I have attached the file if anyone has the time to take a look. Thanks for any assistance or hints you can give me.

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Solution
Accepted by topic author fishtails

Input to AND gate U42 is BA'. You want CA'. See attached.

 

Digital Guy

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