universal slot machine error code 12

mohawk640

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Donor 4 years: 2015, 2017-2019
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I have a issue with a slot machine it will not boot up . Keep saying​ error code 12 . No sound . What could it be ? I have flip the z80 cpu . Change edge connecter . Still the same
 
i think 12 is a ram error. there is a fat little push button on the bottom of the board. there is a little cover on the board holder. take it off and press the button. should reset. may need a memory battery too. the button can be hard to find, doesnt always line up with the hole, but its there.
 
I have done the reset button and the battery has been changed about a year ago still having the same issue
 
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