Blitz 99 Graphic Issue in Med Res only

RenegadeFred

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I bought this a while ago, and was in working well. Recent I brought this out to swap out of one of my cabs so I can use the standard res monitor for something else. Well I did test this with the standard res monitor and everything worked as it should. No graphical errors, or anything.

As soon as I plugged it into a med res monitor (flipped the switch also on pcb) issues occur. Everything in the power on test mode checks out, no issues there. It's when it's in attract mode (at the very start) that I notice the issue.

It's fine until it hit's the Midway image, starts for two seconds and then click from the hard drive and all the sudden the alphabet is on the screen over and over.

A vast majority of the graphics are fine. The Blitz logo on the field is faded out and some of the lettering is blocks (near the top of the screen). I'm not sure what could be causing this?

I am trying to upload pictures now, and they will be available shortly.

Should I triple check the power supplies? I'm using 2 different one's so it may be varied (thinking of that just now). Not sure what else to check other then that? I don't know why a simple switch would cause such a problem thou.

Any insight / help would be appreciated.
 
Cancel the above.. It was my power supply. the +5v had dropped the last time I checked and was well below what the game needs. Adjusted that and everything is fine now. I'll still try to update with pictures later on (if I have some from yesterday on my phone). For future reference, just in case this happens to anyone else.

For now I'll adjust my monitor and clean it up and be happy everything is in working condition. Sorry I jumped ahead of myself and made the post.. I didn't think every possible solution out before asking and that was my own fault.
 
At the very beginning of this portion of the attract mode is when the problem arrived (picture imaged is of the scene but without the graphic error)

0516121727.jpg


Here's what actually shown up once the error occurred.

0515121600.jpg


Shortly after it would continue attract mode and you can clearly see the blocking of the letters. Very strange, but i'm glad it's back to normal.

0515121600b.jpg


0515121600a.jpg


Back to normal once the power was properly adjusted.

0516121725.jpg
 
you know how I always suggest cleaning the JAMMA edge with an eraser..?

trust me, it helps. ;)
 
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