Bally's PARTY ZONE PINBALL MACHINE ISSUE PLEASE HELP!

noname707

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Bally's PARTY ZONE PINBALL MACHINE ISSUE PLEASE HELP!

I recently picked up a Party Zone Pinball machine everything seems to work great except the the big led display that usually shows the score and game animations just shows random dots, and garbled dot patterns. What could be the problem?
I must add I am a complete newbie to working on pinball machines. I work on arcade machines mostly.
 
I recently picked up a Party Zone Pinball machine everything seems to work great except the the big led display that usually shows the score and game animations just shows random dots, and garbled dot patterns. What could be the problem?
I must add I am a complete newbie to working on pinball machines. I work on arcade machines mostly.

The most likely culprit is a loose connector. look in the backbox (with the power off) and make sure all the connectors are properly seated.

PZ is a great game, but the head in the middle is often not working. Does he move his jaw to talk or turn his head to follow the ball around the playfield?
 
The most likely culprit is a loose connector. look in the backbox (with the power off) and make sure all the connectors are properly seated.

PZ is a great game, but the head in the middle is often not working. Does he move his jaw to talk or turn his head to follow the ball around the playfield?

He turns his head around.
I tried reseated all the connections and it's still just garbled dots?
 
It could be a bad ribbon cable that runs from the MPU to the sound board to the DMD controller board, or it could be the skinny output ribbon cable that runs from the DMD controller to the DMD itself.

It could also be the RAM on the DMD controller board is bad. Check out the PinWiki for diagnostic steps.
 
Is the game working now that the display shows ramdom dots? Working, but you can't see anything but the dots on the display?

If the game is not working at all, you likely have a bad bridge rectifier at BR2, or capacitor at C5 on the driver board. If one or the other is bad, change them both.

-mike
 
Thank you guys for your help. On further inspection one of the cables was chewed so I replaced it and everything works perfect. This is an very fun pinball machine.
Thanks again everybody.
 
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