Donkey kong power supply issue please help!

noname707

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I recently picked up a Donkey Kong everything is original, and looks to be in pretty good shape. When I plugged in it and turned on the switch nothing came on except the marquee light. I took the boards out and tested them on my DK Jr and they worked fine. I put the boards back in and checked all the wire connections. and im still getting the se result. Is there something I'm overlooking? Or is my power supply done? Thanks for any help you can give me.
 
It could also be the monitor. Remember, that in Donkey Kong (and other Nintendo games), the audio amplifier is part of the monitor. If the monitor is dead, you won't get any sound or picture. Check to see if you're getting 5v on the game boards. Also, check the small 300ma fuse on the back of the monitor. If it's blown, then you've found your problem.

-Ian
 
It could also be the monitor. Remember, that in Donkey Kong (and other Nintendo games), the audio amplifier is part of the monitor. If the monitor is dead, you won't get any sound or picture. Check to see if you're getting 5v on the game boards. Also, check the small 300ma fuse on the back of the monitor. If it's blown, then you've found your problem.

-Ian
thanks I will check that. I totally forgot about the sound being part of the monitor.
I appreciate the help.
 
thanks I will check that. I totally forgot about the sound being part of the monitor.
I appreciate the help.

You're welcome. Another thing to remember is that you should get something on the screen, even if the power supply is dead - Nintendo monitors take inverted video. With no input signal, it should display a gray/white screen. Disconnect the video cable from the monitor and turn on the game, it should light up.

Also, Nintendo video cables are pretty long - you should be able to put both games next to each other and plug the working DKJr monitor into the Donkey Kong board and see if you can get a picture.

Check that fuse on the monitor chassis. If it's blown, then chances are you need a HOT and a flyback. Do caps while you're at it, obviously.

And, I'll say this again, as people forget, but DON'T plug the Nintendo monitor directly into the wall. I know it looks like a regular wall plug, but it wants 100v from the isolation transformer in the bottom of the game.

-Ian
 
And, I'll say this again, as people forget, but DON'T plug the Nintendo monitor directly into the wall. I know it looks like a regular wall plug, but it wants 100v from the isolation transformer in the bottom of the game.

This really can't be emphasised enough.
 
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