Chicago Cubs 'Triple Play'
Gottlieb, 1985You're currently viewing posts by Pinsider sparky672.
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Quoted from GJH:Tested the power to the light sockets, they all tested good.
There is power to the sockets? Are you testing voltage across both leads of the socket? Then the bulbs should light. Otherwise, you have bad sockets or bad bulbs, there is literally nothing else.
Quoted from GJH:... all bulbs tested good, or were replaced.
Then there is a problem with how you're testing things or the way you're describing the issue.
Quoted from ChrisHibler:There is an old style relay in the bottom, right side of the cabinet, that might be labeled T..
General illumination power is switched by that relay.
Examine those switches. Manually open/close the relay./
How can he have power at the sockets and yet bulbs won't light?
Quoted from GJH:... I'm testing from above playfield, red down into socket, and black touching metal outside cabinet. Guessing this isn't correct for testing. I tried touching black to under playfield ground wire that connects all sockets, and I do not get any power at all to the sockets.
That makes a bit more sense (how it was tested explains the contradictory explanation before). Maybe the ground (common) side of the sockets are switched by the relay. I don't have the schematics for your game, so maybe ChrisHibler can confirm?
EDIT: As pointed out in subsequent comments, I think your playfield GI is 6 VAC, not DC. In that case, the "common" side of the sockets are the "AC Return". Please refer to your schematics... you cannot be effective in your troubleshooting without a set of schematics for your game.
Quoted from KenH:Isn't the GI is around 6VAC on Sys80's? There would be no 'ground' if the GI is AC.
If you are testing for a DC voltage on an AC circuit, then the readings are not valid.
Good catch!
Yes, the playfield GI is 6.3 volts AC... the bare wire side that's wired to the shell of the socket is the "AC return"...
Quoted from GJH:... I'm testing from above playfield, red down into socket, and black touching metal outside cabinet. Guessing this isn't correct for testing.
No, you cannot measure these AC voltages to an arbitrary metal ground. The other side goes through the T relay.
Switch your meter to AC to check for proper socket voltage by measuring across the two socket terminals. Also verify the normally closed switch contacts on the T relay are clean, touching closed, and read zero resistance when the T relay is not energized.
Below is for my System 80 Gen 2 game. Refer to your own schematics to be certain your System 80B is the same.
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Manhattan, IL