(Topic ID: 185678)

Bop bumpers staying engaged (sort of)


By Spraynard

2 years ago



Topic Stats

  • 16 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by alexanr1
  • Topic is favorited by 2 Pinsiders

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#1 2 years ago

I have this peculiar problem on my big game. when the bop bumpers fire they stay on--however they don't seem to be locked on at full power. for example, I can bang my fist on the playfield or trigger another pop bumper to fire and the ring will return to normal position. Interestingly, i cannot manually push down the ring and get it to stick, so it seems that it is maybe electric.

I've loaded a video to youtube to illustrate.

Any ideas on trouble shooting?

#2 2 years ago

If you turn off the game while they're down do they come up? If not, it's a mechanical binding problem probably. Do they move freely? New sleeves?

Rarely it could be that the coil stop is magnetizing. Put a bit of thin cardboard or something at the bottom sandwiched between the stop and the coil.

#3 2 years ago
Quoted from zacaj:

If you turn off the game while they're down do they come up? If not, it's a mechanical binding problem probably. Do they move freely? New sleeves?
Rarely it could be that the coil stop is magnetizing. Put a bit of thin cardboard or something at the bottom sandwiched between the stop and the coil.

good call on turning off. I just did that and they stay down, suggesting it is not electrical. the weird thing is I cannot repeat the behaviour manually-- if I manually push them down they pop right back up.

The other peculiarity is that this occurs on all three pops.

Oh and yes, there is no obvious binding. in fact i just rebuilt all three pops. (new sleeves).

#4 2 years ago

Check the coil stop. It might be mushroomed and/or magnetized extending the stroke and grabbing the plunger.

#5 2 years ago
Quoted from Spraynard:

The other peculiarity is that this occurs on all three pops.

I had the magnetizing problem on all six bumpers of my Black Hole. Not sure what the cause is, maybe just a bad batch or something

#6 2 years ago
Quoted from zacaj:

I had the magnetizing problem on all six bumpers of my Black Hole. Not sure what the cause is, maybe just a bad batch or something

is there a way to demagnetize or do you have to just buy new ones?

#7 2 years ago
Quoted from Spraynard:

is there a way to demagnetize or do you have to just buy new ones?

Coil Stops should be replaced. I will leave it up to someone else to get you the proper part number from a manual. It might be a screw in stop or plate with mounted stop, but are usually not expensive at all and a easy swap. They are a regular maintenance part like brakes on a car and will last you a life time in home use.

#8 2 years ago

I have also seen really dirty coil sleeves, rusted bumper arms and springs that need replaced. All mechanical issues. I would recommend tearing them down and going through them checking all of this and possibly magnetic issues.

#9 2 years ago
Quoted from Taxman:

Coil Stops should be replaced.

Most of them aren't replacable though? Sterns might be the exception actually, depending on the year....

Quoted from Spraynard:

is there a way to demagnetize or do you have to just buy new ones?

No way that I know of. Try the cardboard to see if it fixes it

#10 2 years ago
Quoted from alexanr1:

I have also seen really dirty coil sleeves, rusted bumper arms and springs that need replaced. All mechanical issues. I would recommend tearing them down and going through them checking all of this and possibly magnetic issues.

Yes, they were just disassembled and cleaned. The only thing I didn't replace was the coil stops.

#11 2 years ago
Quoted from zacaj:

I had the magnetizing problem on all six bumpers of my Black Hole. Not sure what the cause is, maybe just a bad batch or something

when you realized your coil stops were magnetized, would the plungers stay down when you manually depressed them? the thing that has me most confused is that when i manually move the plungers, there is no binding or sticking or anything. they only sticks when the coils are energized.

#12 2 years ago
Quoted from Spraynard:

when you realized your coil stops were magnetized, would the plungers stay down when you manually depressed them? the thing that has me most confused is that when i manually move the plungers, there is no binding or sticking or anything. they only sticks when the coils are energized.

Nope, only when they fire. The coil would magnetize them just enough to hold the plunger down, and it'd fade eventually.

#13 2 years ago

Could you overcome the minor magnetic issue with a stronger spring? The coil energized is very strong and will compress a stronger spring. Just a thought...

#14 2 years ago

Did you ever resolve this?

#15 2 years ago

oops forgot to update! So here's what I did....

Took out the plunger and coil stop. ran the plunger through a demagnetizer a few times. Then dropped both onto concrete a few times from about waist height. Then I stretched out the springs a bit more to make them stronger.

After I put everything back together, everything seems to be okay. There is one pop bumper that sticks sometimes, but for the most part, all good. Since I shotgunned it I have no idea which of those things did anything meaningful, but all that matters is it worked.

#16 2 years ago

Glad you resolved it.

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