Author Topic: GTB Sys 1 Playfield feature lights not working  (Read 915 times)

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Offline Retropin

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Re: GTB Sys 1 Playfield feature lights not working
« on: October 03, 2015, 06:47:52 PM »
Ahhh I get it now, i had it arse about so I am not looking at connectors in the backbox, I need to go to the bottom board and look at the bridge rectifier and the wires there. Can a faulty bridge rectifier create this kind of fault without blowing a fuse?

Thanks guys for explaining it to me. :)

It's a magical mystery tour but getting closer I believe.

Cheers: Brettski... :)

Got nothing to do with bridge rectifiers.. don't go poking around there as these are to make the 240V AC into DC. The lamps work off 6VAC which comes direct from the transformer via a connector as Boots said. First thing you need to do is make sure the braided wire that runs through the pf actually has 6V on it where the lamps are not working. With CPU controlled lamps, they have 6VAC on both sides of the lamp at all times. When the CPU wants to trigger a lamp one side is run to ground via a transistor or similar.
Your CPU may well be working fine but if you don't have the 6V then there is nothing to run to ground. That's why I suggested to take a wire from an earth source and touch the signal side of the lamp with it... if the 6V is present then it will light up. If this happens then you have a CPU fault.
If nothing happens then you more likely have broken line in the braided wire. Once this is determined, follow the braid to each lamp until you hit a working one and right there is where you will find the broken link