(Topic ID: 61777)

Gottlieb Sys3 no GI backbox

By robm

10 years ago



Topic Stats

  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 10 years ago by viperrwk
  • No one calls this topic a favorite

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#1 10 years ago

Fixing a Freddy Gottlieb Sys 3 which i know very little about. I have no GI for the backbox (pf is fine)

Have checked fuse F8 out of circuit, and it tests good.

The 'A' relay opens and closes, and there is continuity when it closes on the buzzer on the multimeter, but i cannot get any 6v AC reading on any of the light sockets in the backbox.

The 'T' relay (which i understand turns pf GI on and off) does not move, but pf GI is on permanently

There is a GI bulb on the coin chute and it works fine

Have reseated a few connectors going to the backbox with no sucess.

Any tips on where to keep looking, i'm starting to think there may be a wiring problem, but not sure where to start looking/testing as the pair of AC wires that runs backbox GI are not marked where i can see in the manual.

#2 10 years ago

The coin chute lights are fused on the same circuit as the playboard so if playfield GI is working the coin chute lights should as well.

I would test the relays in solenoid test. They are 20v relays and if you have working flashers in the game you would have power for the relays. If the "T" relay is locked on I would check Q31 on the driver board to see if it failed.

The GI circuit is very simple - transformer -> fuse -> relay -> lights -> ground. If you don't have power at the light sockets, check if you have power at the fuse. If you do, and the relay is pulling in, I'd check and clean the points on the relay - they can get dirty enough to cause a problem.

If the coil is bad, Steve Young sells replacements but I'm not sure he has replacement points.

viperrwk

#3 10 years ago
Quoted from viperrwk:

If you don't have power at the light sockets, check if you have power at the fuse.
viperrwk

Thanks for the info - i gave the points a good clean. One thing i am not certain of is how to test for power at the fuse - being AC, is there a common return wire for all the AC circuits, or does each have its own return wire - if so, does anyone know what colour it is?

#4 10 years ago

Black wires on the transformer panel are the AC common. There are multiple common wires that are all tied together.

viperrwk

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