(Topic ID: 197270)

Black Hole (Gottlieb System 80) Repair Log

By wxforecaster

6 years ago


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#23 6 years ago

No need to replace the crystal if it measures ok.
Don’t fix it if ain’t broken

8 months later
#38 5 years ago
Quoted from wxforecaster:

OK down to the final last issue with this beast after taking a break. Finished up all of the ground mods, but no dice. (The pop-bumper issue above was a board and has been resolved).
The remaining odd behavior is an audio one.
Usually, if I boot the game cold and play a couple balls, it's fine. After that I see the following behavior...(see video below).
When the ball goes from the trough into the shooter lane, instead of a rather cool sound effect, it's replaced by the "Tilt...tilt...tilt...tilt...tilt...tillllllllt sound effect" (the game is not in tilt). You can proceed to play the ball normally, but there is no background music.

I'm not understanding what is causing the wrong audio to play here (and the background music drop out), as it does typically start up and play fine initially.
How can I resolve this?

I am not sure if this is relevant ...
I had similar problems with my Robowar , and it was a bad sound eprom .

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