(Topic ID: 125699)

Gottlieb Pin-Up "WOW" issue


By Fish

4 years ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 4 years ago by DirtFlipper
  • No one calls this topic a favorite

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#1 4 years ago

Hoping someone can help. All of a sudden, my pin-up add-a-ball version of King Pin won't engage in "wow" mode. It's supposed to engage when you take down the 10 drop pins. The pins reset as they normally do, but not in "wow" mode. Any help would be appreciated.

#2 4 years ago

I would start with the switch that closes when all targets are down on the drop target unit. A trip arm inside the DT unit allows the switch to close which should send a pulse to the WOW control relay (check your schematic for exact name/details). Simulate all targets down with the play field up and see if that relay activates. If it does, then likely a switch on the relay itself is not making.

#3 4 years ago

I think I have a bad hold relay coil. It's way too hot. I'll check the ohms and go from there. Thanks for your help!

#4 4 years ago

The Hold relay is on continuously, and will be very hot. If it's the original coil, it's not a bad one to replace (they can get a loud hum over time), but it's not really involved with adding Wows.

#5 4 years ago

Okay, now the wow mode is working, but once in a while, when I hit a drop target, the playfield lights dim and then the playfield light fuse blows. I really appreciate the help. By the way, it was the switch that closes when all the targets are down that caused the wow mode malfunction. Thanks stashyboy!

#6 4 years ago
Quoted from Fish:

but once in a while, when I hit a drop target, the playfield lights dim and then the playfield light fuse blows.

So you'll be looking for a short in the lighting circuit. Common causes are bulb socket tabs (the part with the cloth-covered wire attached) bending into the socket, or twisting over and touching another piece of metal. Since it happens with a drop target hit, maybe start by looking carefully around the drop target area bulb sockets for anyplace where metal could be touching one of them.

These types of shorts can be very difficult to spot though, so it helps to go very methodically through each socket and connection to verify there's no stray metal touching.

Other techniques get more involved, and a lot more intrusive (by isolating the circuit segments).

A clue can sometimes be found by determining which light is being lit by the event prior to the fuse blowing (since the path to that bulb is being activated, and the short occurring). So when you hit a particular drop target (or after a series), if it's the same light that then comes on, check that one carefully.

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