Zoo Keeper - Horizontal Lines. Is this normal? Top of screen.

barakawins

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Zoo Keeper - Horizontal Lines. Is this normal? Top of screen.

I've brought back a Zoo Keeper and managed to repair a spare main board too.
This zoo keeper has an original 4900 monitor in it. Looks fantastic. However, I get these horizontal lines which appear mostly in attract mode on the main screen where "Zoo Keeper" comes up only on the screen with the rainbow edges. This also occurs during game play as well once in a while. They look like horizontal scan lines within the first 4 inches at the top fo the screen and then they go away. Is this normal or is there a fix for this? I've seen this problem mentioned before but no fix.
 
I think its normal because mine does it at the 'Zoo Keeper' screen as well. It doesn't happen during game play though.
 
Zoo Keeper

I normally get it at the Zoo Keeper attract screen. Sometimes It normally doesn't happen during game play but I do once in a while get a small horizontal line which then disappears. I wonder if there is a fix for this.
 
I normally get it at the Zoo Keeper attract screen. Sometimes It normally doesn't happen during game play but I do once in a while get a small horizontal line which then disappears. I wonder if there is a fix for this.

Yeah, I kinda was neurotic about it at the beginning as well. I got used to it though.
 
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