Tempest Cocktail - Distorted Picture

72Demon

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Hello,

I just got my Tempest Cocktail running with the help of KLOV. Now that it is powering on, it has a distorted picture. I tried doing the adjustments on the PCB but can not get the mazes correct. I could adjust certain test screen grids but not ones that correct this issue. It also causes the spot killer to come on and the screen shuts off. For some reason when you put credits and press player start it comes back up again and you can play Tempest with the distorted screen. After the game is over, the screen may shut off again. Sometimes you can get it into the test screen, other times it causes the spot killer, screen crash when you flip the test switch. It will also crash during the attract mode. I tried reseating all the monitor connections and PCB connections. I tried researching this issue, but did not find anything similar to my screens distorted grids.

It does not give any rom errors duing the test screen.

Has anyone seen this (distorted grids & random spot killer crash) or know what is causing it?
 

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  • Tempest Distorted.JPG
    Tempest Distorted.JPG
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  • Tempest Distorted 1.JPG
    Tempest Distorted 1.JPG
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  • Tempest Distorted 2.jpg
    Tempest Distorted 2.jpg
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  • Tempest Distorted 3.jpg
    Tempest Distorted 3.jpg
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  • Tempest Spot Killer.JPG
    Tempest Spot Killer.JPG
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Last edited:
Here is a few more picture of some test screens:
 

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  • Tempest Test Screen.JPG
    Tempest Test Screen.JPG
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  • Tempest Test Screen 1.jpg
    Tempest Test Screen 1.jpg
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Similar Problem

I think I am having the same problem and I am adding one additional test screen in case it helps someone diagnose this. It is supposed to be a grid of squares but it looks more like a pink floyd album cover.
 

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  • image.jpg
    image.jpg
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Last edited:
This was caused by the large PCB, Vector Generator PCB. I got another PCB set that would cause the spot killer to come on. I reflowed its interconnect cable pins, cleaned the edge connectors and found a X-pot that was putting out zero resistance, - I believe that was the main cause of this PCB set to go into spot killer. I also swapped out my original small PCB, Math Box onto the second Vector Generator PCB and now have a working Cocktail Tempest.
 
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