bally goldball

[studley67]

need help please finding the type p/n of goldball gi triac mounted in lower cab,regards damien

[studley67]

  and while we are on the subject,how does it work?looks like 2/3 diodes in one package.seems to be intergrated in a flasher circuit.any esplanation welcome,damien

[Douggie]

Very simplified...a triac is like a SCR, but for AC (not dc), they conduct and control current flow in both directions of an AC Cycle and have similar connections to a scr (anode, cathode, gate)

Probably the most common application for a Triac would be wall mounted household lamp dimmers, drill speed controllers etc...

I have no idea what function (other than the above) they would have in a pinball

[studley67]

 ^&^they are intergrated into the backbox gi lighting,thinking they help the two aux boards pulse/flash the globes,for effect lighting.that will be cool.

[beaky]

they are probably used instead of relays to switch the lights on and off.
I haven't checked so i could be wrong

[studley67]

found out what they do http://www.tpub.com/neets/book7/26e.htm
but still need a part number,please help

[beaky]

found out what they do http://www.tpub.com/neets/book7/26e.htm
but still need a part number,please help

how many pins does it have 3 or 6?
i am looking at the schematic and i have found 2 different types

[studley67]

2 wires going to 1 pin and 1 wire going to the other pin + ground i guess from the body to the mounting plate.i looked at the schematic and got part no. E565-67,means jacks..t to me.regards damien

[beaky]

I am searching for you as hard as i can.
is there a number on the triac it self?
can you take a photo of it for me?

[studley67]

best i can do is a photo

[studley67]

that came out bad,try again

[beaky]

thats going to be tricky, I can give you a number of another type of Triac but it has a different package, I will go over the scematics and see if it should work.

[studley67]

thanks.i could manage without that feature,but would like the machine 100%

[beaky]

thanks.i could manage without that feature,but would like the machine 100%

so is it dead or staying on permanently?
is there also one for the back box g.i's that u can swap it with to make sure its the triac not the triac driver?
have you checked the lamp that is connected to the scr is blown?

this is what marvin says about it (it mentions ms pacman but it should be the same)
"I am working on a Mr/Mrs Pacman, and I notice the GI (general illumination) lamps flash on and off at certain times during attract mode, but does not come on during game play."
To make the GI lamps flash on and off, Bally used a Triac bolted to the power supply board in the cabinet. The triac is cycled by the GI lamp flasher board mounted under the playfield. This flasher board is similar to a solenoid expander board. The output of a lamp SCR driver is used to drive a MOC3011 opto coupler that drives the Triac. As with the solenoid expander board, a dummy 555 lamp is connected to the SCR output on the flasher board to insure there is enough current draw to drive the MOC3011. Most likely this 555 bulb is burned out, and causing your problem. Also check the flasher board for bad (cracked or cold) solder connections. Check all the cable connections to the triac too. Lastly you can replace the MOC3011 chip.

[studley67]

thanks i`ll try