I am troubleshooting pop bumper fuse issues as well on my haunted house. Why are your pop bumpers blowing the fuse for the sound board? Is there more than one F8? Have you done the mods?

http://www.pinwiki.com/wiki/index.php?title=Gottlieb_System_80#Pop_bumper_problems

I keep blowing F4, but I'm sure I have a bad transistor on one of my pop boards.

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F4 is the fuse for all the solenoids, including the pops. The pops are locking on when I start a game and blowing F4, when I unplug the pbdbs, the game plays fine and the fuse doesn't blow. Also, I had to stop working on it tonight due to unfortunate circumstances.... Anyone have a spare playfield glass for a haunted house?

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System 80s are an adventure. Blownfuse would have been able to tell us. RIP brother.

I still haven't decided what grounding mods the game really needs. I am super thankful I only broke the playfield glass instead of the backglass, that would be a heartbreaker.

I wasn't looking for advice on my issue, I was just explaining why I had spent the day reading about system 80 pop bumpers and sharing the link.

We both are suffering from suspect pbpd boards.

Rottendog makes a replacement pop board, it might be worth the $25 to replace the bad one.

Try disconnecting the spoon switch and see if it still activates. It could be the leaf is too tight and activating the bumper. If it still activates with the spoon disconnected, then we know there is a short or diode issue.

If the coils are firing, then the transistor doesn't need replacing. The pop and the flipper shouldn't be connected unless there is a short or a ground wire that isn't connected quite right. If it is a diode, it will be on the flipper.

Could be. My issue turned out to be poor connections. My pop boards were already updated.