Donkey Kong - No sound and jittery image?

rydin4life

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A neighbor approached me yesterday and asked me if I'd be interested in looking at his sister's Donkey Kong game. He said she's had it for years and enjoys it, but it has no sound and the image is "jittery and unstable". I've never worked on a Donkey Kong before so I'm not familiar with them - I assume check the basics like power and likely the monitor needs a cap kit and a good reflow. Where do I start regarding the issue of no sound?
 
With jitters I'd check the hold pots on the monitor (particularly h hold) and the position pots on the game board. No sound is a little bit vauge. If you hear no buzzing from the speaker, I suspect the audio amp on the monitor if you hear buzzing it's anyone's guess. Caps fix a lot of problems on 20ez but caps aren't always the solution with the amp.
 
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