Asteroids problem...Rocks get big and screen zooms in.

learpilot2

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Asteroids problem...Rocks get big and screen zooms in.

I just bought a asteroids machine, and it works normally except that after 10 minutes of play, the asteroids get bigger by about a 1/4 inch. The screen seems to zoom in. The ship, rocks and score counter are also larger. Is this an easy fix, or monitor adjustment.
 
Sounds like a simple case of the monitor "blooming". If this is the case, your HV (High Voltage/stick) Diode is bad. They are easy to replace (no soldering) and several vendors including Bob Roberts carries them....

There are a few other things it could be but this is by far the most common cause...
 
Mongo, what other things. I put a new HV diode in my battlezone (same monitor) for the same reson. It doesnt bloom as fast, but it still blooms after being on a half hour or so. It grows so much the radar is completely off the top of the screen. Not trying to hijack, Ive just been busy with other things before I decided to put a post up.
 
I had a bad 74LS161 chip on an old Asteroids board that caused this same thing... or at least a similar thing...

If you can, check your board with an O-Scope while it is blooming to make sure your board is not the culpruit..
 
I had a similar problem. My screen would begin to bloom and the screen would "breath" when the letters would flash. I recapped the monitor and replaced Big Blue then my problem went away.not sure if it would work for you but it worked for me.
 
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