(Topic ID: 265361)

Gottlieb 300 Power on problem


By SevenHorses

3 months ago



Topic Stats

  • 7 posts
  • 3 Pinsiders participating
  • Latest reply 3 months ago by DaMoib
  • Topic is favorited by 1 Pinsider

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#1 3 months ago

Still working on this old Gottlieb 300.

I'm pretty sure that the (Q) game over and (U) first ball relays should engage as soon as the power is applied to the game.
They do not.

I checked the fuses and all look good.

I am getting lights in the backbox.

One other thing I noticed is that the Tilt light is lit . (none of the tilt switches are closed).

Give me some hints on what this could be or how I could diagnose this problem
I have the schematic and have some small skills in reading it.

thanks

#2 3 months ago

This switch on the Hold relay (R) is connected directly to the Game Over relay (Q) coil and should activate it as soon as power is applied
pasted_image (resized).png

This switch on the Tilt Hold relay is connected directly to the First Ball relay (U) coil and should activate it as soon as power is applied
pasted_image (resized).png

Quoted from SevenHorses:

One other thing I noticed is that the Tilt light is lit

This is normal

#3 3 months ago

Thanks HowardR. This is helpful.

1 week later
#4 3 months ago

howardr

I connected a jumper from the playfield fuse lug to the white wire on R and I can get the First ball (U) and Game Over (Q) relays to pull in and the motor starts.

However it won't do this without the jumper.

Could you give me further hints to help me diagnose?

Also I noticed this jones outlet near the transformer which is missing a label. (see pic). Can you tell me what it does? Should it have a plug that connects it?

thanks HowardR!

unlabeled_jones (resized).jpg
#5 3 months ago
Quoted from SevenHorses:

I connected a jumper from the playfield fuse lug to the white wire on R and I can get the First ball (U) and Game Over (Q) relays to pull in and the motor starts.

However it won't do this without the jumper.

Sounds like the Make/Break switch on R with the white wire is out of adjustment.

For a switch to work 3 things are necessary:
1) When open, there should be a small space between the contact points (duh)
2) When closing, the long blade's contact point should push the short blade's contact point enough to move the short blade
3) The contact points should be clean, which they usually will be if #2 is happening

Quoted from SevenHorses:

this jones outlet near the transformer which is missing a label.

It might be listed in the manual.

#6 3 months ago

Asked the question about the female jones connector on Facebook. The answer is this is the receptacle for the A-15597 circuit delay module.
It delays counting the bonus . Apparently the game will work without it. Providing the info here in case someone asks a similar question.

howardr

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#7 3 months ago

So, without the delay unit, you consistently get a single bonus when you drop the ball in the yellow hole? No mystery single/double/triple bonus?

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