(Topic ID: 238155)

Pop bumper light lights at wrong times


By n1teowl

1 year ago



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  • 24 posts
  • 6 Pinsiders participating
  • Latest reply 1 year ago by n1teowl
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Popbumper3 (resized).jpg
Popbumperconnection2 (resized).jpg
OlympicHockey (resized).PNG

#1 1 year ago

I have an Olympic Hockey that is not behaving properly. I took apart the lower left pop bumper to put a new platter on and now it's acting weird. When a game is started, only the lower left pop bumper light is lit. It's normally supposed to be dark and light along with the upper right pop bumper when a lane is activated (thereby increasing the score from 10 to 100 for these bumpers). When I activate the lane, the upper right light goes on and the lower left one goes out. Both pop bumpers score correctly (10 or 100 when the lane is activated). It's just that the lighting for the lower left bumper is reversed. I haven't had the game that long and don't remember if it was doing this before I took apart the pop bumper. I took it all apart again and put it back together and it's still acting the same way. Any ideas? The schematic snippet is below. Thanks in advance for any help.

OlympicHockey (resized).PNG
#2 1 year ago

Is it brighter when it should be off than the others when they're on?

#3 1 year ago
Quoted from zacaj:

Is it brighter when it should be off than the others when they're on?

I'd say it's the same brightness.

#4 1 year ago

What are the other two lights associated with that circuit doing? Do all the lights associated with the yellow relay operate properly?

#5 1 year ago
Quoted from EMsInKC:

What are the other two lights associated with that circuit doing? Do all the lights associated with the yellow relay operate properly?

Yes, all other lights associated with the relay operate properly (red relay). All lights associated with the other (yellow) relay work fine. It's just the one pop bumper light that is not working right.

#6 1 year ago

That's bizarre. that's a really simple circuit, and you'd think if it was malfunctioning, all of the lights in the circuit should be doing the same thing.

Without seeing it in person, I'm pretty much lost on this one. It almost sounds like the wrong wire is attached to the pop bumper lamp socket but that can't be it.

#7 1 year ago

I know! It's really strange. I don't know how it's possible. That particular lamp is the last one on the circuit before the wire runs back down the wire harness. That means there are two wires of the same color twisted together and connected to that bulb. If I disconnect it completely from the lamp but keep the ends twisted together, the light no longer works (of course) but the others on that circuit function as normal. And it's not just that it doesn't work at all, it works opposite to how it should. They should all either be on or off, right?

#8 1 year ago
Quoted from n1teowl:

I know! It's really strange. I don't know how it's possible. That particular lamp is the last one on the circuit before the wire runs back down the wire harness. That means there are two wires of the same color twisted together and connected to that bulb. If I disconnect it completely from the lamp but keep the ends twisted together, the light no longer works (of course) but the others on that circuit function as normal. And it's not just that it doesn't work at all, it works opposite to how it should. They should all either be on or off, right?

Humor me and try something. Disconnect that lead to the lamp socket and connect a jumper from the other bumper to this one. That should at least make the lamp work properly. Leave the other wires together. It's a hack, but hell, sometimes you have to hack when something this mystifying happens.

#9 1 year ago

I'm happy to try anything. I disconnected the wire from the pop bumper light and jumped from the other pop bumper. The same behavior happens. Light is lit a start and goes out when rollover is triggered.

#10 1 year ago

Take a pic of under the playfield of the pop bumper you put back together

#11 1 year ago

It's not pretty but here it is.

Popbumperconnection2 (resized).jpg
#12 1 year ago
Quoted from EMsInKC:

sometimes you have to hack when something this mystifying happens

With more respect than @emsinkc gives me, I strongly disagree.

Try swapping the other wire instead and/or in addition.

#13 1 year ago
Quoted from HowardR:

With more respect than @emsinkc gives me, I strongly disagree.
Try swapping the other wire instead and/or in addition.

I think I tried what you are asking. I disconnected the yellow wire and jumped the connection from the other pop bumper. The behavior was the same. Did I understand you correctly? Thanks.

#14 1 year ago

There must be a short causing it to get power from another source. Possibly some solder dropped on something causing a short?

#15 1 year ago
Quoted from n1teowl:

I think I tried what you are asking. I disconnected the yellow wire and jumped the connection from the other pop bumper. The behavior was the same. Did I understand you correctly? Thanks.

There are 2 wires to the light bulb. Temporarily swap the other one instead.

#16 1 year ago

I'll look into your suggestions tonight. I'm beginning to think I shorted something somewhere as you suggested Cdemuro.

#17 1 year ago
Quoted from HowardR:

There are 2 wires to the light bulb. Temporarily swap the other one instead.

Swap what wire? They're tied together at the lead to the bumper coil socket.

If you disconnect the wires to the bumper that is lighting incorrectly and jumped from the correctly performing lamp, it should work correctly. Try the same thing from the other two lamps in the circuit and let me know.

#18 1 year ago

OK, so I disconnected the pop bumper lights from the one lighting incorrectly and jumped them to one working correctly. The result was that they both worked correctly. The same goes for the other two lamps in the circuit. To take the pop bumper out of the loop, I jumped from one side of the bad pop bumper to the other, using a single bare bulb in the middle. The bulb responded in the same way as the bad pop bumper did. That is to say it started out lit and then is went out when the rollover was triggered.

#19 1 year ago
Quoted from n1teowl:

OK, so I disconnected the pop bumper lights from the one lighting incorrectly and jumped them to one working correctly. The result was that they both worked correctly. The same goes for the other two lamps in the circuit. To take the pop bumper out of the loop, I jumped from one side of the bad pop bumper to the other, using a single bare bulb in the middle. The bulb responded in the same way as the bad pop bumper did. That is to say it started out lit and then is went out when the rollover was triggered.

Well, I'm certainly no expert on electrical issues, but it suggests to me that the bulb is getting ground when it shouldn't. I assume it was working properly when you took it apart, right? I'd inspect around that area and see if you've got a solder splash or something in there that is causing current to flow when it shouldn't. The only thing about that is, if it was shorting it should blow the fuse.

When you say you disconnected the lights, are you saying you disconnected both the hot and ground leads from the bad bumper and then jumpered both the ground and the hot to the good bumper? I was suggesting just disconnecting the hot and leaving the ground braid soldered to the other lead of the bad bumper socket. If you connect the hot wire back and jumper the ground to the ground of the other bumper, what happens? You don't need to resolder. Just jumper the ground and see if the light comes on improperly. If it doesn't, then activate the rollover and then just touch the hot wire to the bumper socket lead.

This is really weird. You'd expect all of them to act up because all of the current is coming via one wire/switch. Something you did when you resoldered that socket has to be causing this, but I'm damned if I know what.

#20 1 year ago

n1teowl , if you'd like to try a phone call, send me your cell # in a private message

#21 1 year ago
Quoted from EMsInKC:

I was suggesting just disconnecting the hot and leaving the ground braid soldered to the other lead of the bad bumper socket. If you connect the hot wire back and jumper the ground to the ground of the other bumper, what happens? You don't need to resolder. Just jumper the ground and see if the light comes on improperly. .

So if I keep hot on the bad bumper and remove the ground, then I take the ground and jump it to the good bumper, it works like it is supposed to. I also noticed a ground wire near the bad pop bumper that appears to be broken. I'm not sure how this is related as there is no obvious place that it should be connected.

Popbumper3 (resized).jpg
#22 1 year ago
Quoted from HowardR:

n1teowl , if you'd like to try a phone call, send me your cell # in a private message

Thank you HowardR for the kind offer. I might take you up on it if things continue to stay broken, but I feel like I have a few more things left to try so I'm not wasting your time.

#23 1 year ago

I figured it out! That broken wire was the ground, the other similar wire was hot. So someone had wired the yellow/orange hot wire to one side and the hot braid to the other. I'm sure that I didn't mess it up as someone had soldered a short wire to the hot braid to make it reach the pop bumper and I just reconnected it. Anyway - thanks everyone for the help. I'll have to solder in some new wire to fix this, but should be done in no time.

#24 1 year ago

In thinking about this more, what happened makes sense. With the relay not activated, power is flowing backward through the hot wire that was mistaken for a ground, and back through the yellow/orange wire to ground. When the relay is activated, now power is flowing forward through the yellow/orange wire and is coming up against the power coming in from the other side. The result is lit when relay not activated and off when relay activated.

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