The four larger #63 lights have never come on during game play. They have tested good with a meter.

I have looked at At the manual/schematics for awhile trying to cypher it but I am not really great at that yet. If you could point me to the circuit and places to check with a meter I would appreciate it.

But before that.....when should they come on? Maybe all is well and I have not achieved game conditions that would trigger them to light.

Thanks for all of the help.

Yes those are the bulbs I am referring to.

I am not in front of the game at the moment but I am almost positive there are no diodes installed currently on theses lamps in my game. I remember that because I thought it odd that there where none. The circuit did not seem complete on visual inspection.

Anyone have photos of a backbox on how this is wired, and/or schematics?

Correct diodes to purchase?

Thanks for the help

Thanks for the reply grumpy.

Right now I do not have working displays (missing -100v. I am trying to trouble shoot as many problems as I can as far as I can so I can make fewer orders.... Try to keep the shipping costs down)..so testing from diagnostics is out.

I jumped the metal tab on Q59 to ground and nothing happened.

Here is a photo of the area and some of the schematic for the flash lamp connections.

Appreciate any thoughts

image.jpg

image-608.jpg

34vdc at red tested to braid. Ground tested good as well......34vdc red to black.

.1-.2ohms (very close to zero) brown/blue to tab on Q59

Both longer resistors tested about 5 ohms but both 330ohm resistors tested out at 166 ohms. It would appear that these are likely the problem. Is it common that they would both ohm out at a similar value?

They did light briefly but one of the bulbs in the pair blew when jumping brown/blue to black.

Thoughts?

I dont hAve four of these bulbs currently

Do u think they would sell. This or an acceptable bulb at an auto parts store? Any other big box or electronic store that may sell a bulb that would work?

Looks like auto parts stores and maybe walmart should carry them. A run there should get me by until i can place an order.
I will report back with my findings.

Hmm. Even though the bulbs I originally had tested good using continuity test,I must have had a cracked filament that was NOT good. The reason I say this is because the replacement bulbs all lit when brown/blue was shorted to black. BUT when Q59 was shorted to ground they lit again. This did NOT happen at my initial test.

Grumpy you said this indicates a MPU problem that I would like help trouble shooting ..but I don not fully understand this circuit and I would like to understand it as much as fix it.

could you also give me a few sentences what is happening electrically in this photo? The power comes in at red and travels to two lights. The other two lights seem to get power from brown-blu?, function of brown-blu wire?, grounds do not seem to daisy chain around? Functions of the two sets of resistors? Total newb questions but whatever got to start somewhere. Hopefully I will learn enough to help someone in the future

image.jpg

While we are at it recommendations on a logic probe? Looks like I will need one

So after all that it looks like it was bad bulbs. I have played a few games. They work now....No doubt.

Wow. I tested the original lamps with a meter and all had continuity. I would have had to have TWO flaky filaments to test good but really not be. Possible, but I don't know...I would not have suspected it.

If grumpy or someone could take a few minutes and Answer the questions regarding the cicuit that i posted above I would appreciate it.

Thanks

Just continuity. Obviously this is wrong. What should they ohm out for future reference?

I got it it. Thanks for the walk through.

Well this turned out to be largely an academic exercise but I appreciate the help. We will mark this resolved.