Space Invaders - Working yesterday Not today

norbert

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Hi all,

Powered up my SI (Midway/Bally) today and was greeted by this screen, that's all it does (garbled writing at top and bottom of screen) Everything was working fine yesterday. Anyone got any ideas!!! Thanks.
 

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is it locked at this or can you still coin it up and play?

i would lend you my test rom but its currently bieng borrowed by another klover.
 
Start with the basics - check your voltages on the power supply. Usually thats the first thing to change "out of the blue" and cause issues.

One of our own KLOVERs has a great page on this game:
http://www.brentradio.com/SpaceInvaders.htm

And a link to test the power supply:
http://www.elektronforge.com/TestMdwPS.htm

On top of this, the boards are apparently prone to dirty connections on the edge connectors. I'd unplug the two boards and clean both sides of the edge connectors with one of those wedge shaped pink pencil erasers you can get from a stationary store.
 
Have checked all the voltages on the PSU and at the edge connector. They are all fine. Have cleaned the edge connector as well.

Anyone know where i can get a test ROM from in the UK?
 
Also with space invaders cleaning and reseating the large interboard connector that holds the two boards together helps.
 
Have just removed RAM H and the screen now looks like this. See attched Photo. Also looks the same when all RAM removed.
 

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Have just removed RAM H and the screen now looks like this. See attched Photo. Also looks the same when all RAM removed.

Are you talking RAM?....or ROM? There's a shit load of RAM to desolder on one of those boards.

Edward
 
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