Mark Darts 5000 repair help.

trissa

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Have a series 5000 mark darts that I am hoping someone can give me some direction on.

Problems.

Sometimes is fires up and works and .........

sometimes I get scrambled digits like in the jpgs

also as you can see in the picture that one of the caps only has the negative leads hooked up.

The game cost me a case of beer and junking it would cost another case to drowned the guilt. LOL.

Thanks to any responses.
 

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Mark Darts 5000 repair help

Oops sorry I see pictures are upside down.
 
I believe the big blue cap that only has ground hooked up is used as a filter cap to remove A/C ripple from the DC Current exiting the power supply and entering the logic board. A/C ripple on a D/C circuit can cause all kinds of things to act wonky.

I would first verify that you have a solid +5V exiting the power supply and the same going into the logic board, And do the same for the +12V, If either is alot lower or higher I would then track down what components on the power supply have failed and replace those.

Providing that you have a solid +5, and +12 exiting the power supply and entering the logic board, I would replace the big blue cap and hook it back up like it is supposed to be and see if that cures your problems.
 
I believe the big blue cap that only has ground hooked up is used as a filter cap to remove A/C ripple from the DC Current exiting the power supply and entering the logic board. A/C ripple on a D/C circuit can cause all kinds of things to act wonky.

I would first verify that you have a solid +5V exiting the power supply and the same going into the logic board, And do the same for the +12V, If either is alot lower or higher I would then track down what components on the power supply have failed and replace those.

Providing that you have a solid +5, and +12 exiting the power supply and entering the logic board, I would replace the big blue cap and hook it back up like it is supposed to be and see if that cures your problems.

Thanks for the reply Cnyncrvr

I looks like my 12v is running at 16-17v. Doesn't look like much up stream, other than bridge rectifier. PS has what looks to be 4 diodes but I do not see them on the schematics. will test bridge rectifier
 
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