Louisville, KY
Hey all,
Turned on my QoD today and the backbox GI was out. Checked all over for loose connections and no luck. The backbox lighting fuse was ok but was over-amped. It was a 15 and should be a 10. Any ideas? Thanks!
(Topic ID: 217344)
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Queen of Diamonds
Gottlieb, 1959
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Fuse holder is very tight and the bulbs are good. Jones plugs probably need cleaning! What is the best solution for cleaning them? 91% alcohol?
Quoted from bingopodcast:Fuse and plugs are most likely suspects. Post another photo a little higher up on the lamp side to be sure (need the whole circuit for the backbox lamps).
Hope this helps!
Quoted from bingopodcast:Check your tilt relay. In normal operation, the tilt has a NC switch that powers the lamps. In tilt, the lamps should go off and the tilt lamp should lite.
Gotcha, thanks. What would a tilt relay in an EM look like?
Quoted from bingopodcast:Just like that!
The switch in question is a SPDT switch - the NC side is when the relay is not tripped. The NO side is activated when the game is tilted.
There are other switches in there - the schematic will show you the wire colors - White with a red tracer to white with a black tracer for the normal game operation pair.
Terrific! I’ll check out the schematics! Thanks!
Quoted from bingopodcast:Either switch positions or dirt. Probably just a little dirt or slight adjustment needed on that one switch. Examine carefully.
Gotcha. Any chance this switch would cause the tilt light not to light up?
Quoted from bingopodcast:Yes - the same switch single pole double throw either illuminates the tilt light or the backbox lights.
Ohh ok. I really appreciate the help but I’ve been working on her for hours with no luck. I may call a repair tech who is better with EMs than I am haha. Thanks
Quoted from bingopodcast:Not a problem, sorry I didn't explain it well enough - with the game unplugged, you can examine that relay more easily. You can manually trip the relay (with a pencil or wooden dowel). Observe the switches in the tilt relay. Make sure the ones that were made break, and those that were broken, make. Lift the little brass platform with a finger and it will click in place.
Observe the switches again.
If everything looks good, clean the switch. You can use many different things to clean the switches. A piece of sandpaper cut into strips, the flextone files Steve Young sells, a regular file, or even a business card drawn between the switch leaves.
Check adjustment again. And make sure the switch stacks are screwed down nicely. If that doesn't fix it, look for broken wires on the back of the relay.
You'll have it fixed in no time.
I’ll definitely try that! I’ll keep you updated, thanks
1 month later
Still no luck! I’ve cleaned the switch and everything. Switch appears ok? Does anyone have a schematic of what the relay should look like?
Quoted from bingopodcast:Wouldn't hurt - otherwise you have a broken wire coming off of that SPDT switch or between the switch and the jones plug. You can test for continuity using a multimeter. Try wiggling the wires a bit as well - sometimes there are cold solder joints and the solder will pop off of the switch. If that is marginal, you would get similar behavior.
Gotcha, thanks. So the switch you are referring to would be any of the tilt switches?
Right right, the only strange thing is that the game plays perfectly normal. Considering this, could we still be looking at a tilt problem?
Quoted from bingopodcast:Yes - that relay has more than one switch. Only one controls the lamps.
Alright great! When I depress the switch, the tilt activates normally but still doesn’t light the backbox
Quoted from bingopodcast:Good point!
The backbox card lamps are in the same circuit as the playfield lamps. All run through the tilt switch. So, you're left with a broken/disconnected wire somewhere. I'm guessing that it is on the playfield. Black & White wire is common - see if you can find that wire (it's connected to one side of each socket) and use your meter's continuity beep option to see if you can tone from backbox to playfield socket. Then do the same for hot (the other side). Choose a socket like the title of the game and a socket on the playfield like the arch lights. GI.
Alright! Thanks, dudes! Getting closer 
Quoted from bingopodcast:Good point!
The backbox card lamps are in the same circuit as the playfield lamps. All run through the tilt switch. So, you're left with a broken/disconnected wire somewhere. I'm guessing that it is on the playfield. Black & White wire is common - see if you can find that wire (it's connected to one side of each socket) and use your meter's continuity beep option to see if you can tone from backbox to playfield socket. Then do the same for hot (the other side). Choose a socket like the title of the game and a socket on the playfield like the arch lights. GI.
I’ve exhausted everything! No broken wires anywhere
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