i rebuilt a flipper on police force now it makes a weird buzzing sound

exactly what the title says. It's my first time rebuilding a flipper and everything went pretty smoothly except for two things. The one that worries me is that it buzzes when i hold it. My guts telling me bc its getting too much electricity but i dunno where. the other thing i can live with is the flipper doesn't feel new. i've played with a newly rebuilt system 11 flipper and it's always really crisp. mine feels weak like it's worn out already despite me changing everything but the base out on it. I even changed the coil is that whats getting me?

anyway i made a short video showing exactly whats happening. if anyone has any advice it'd be much appreciated. I really miss this pin. it's playable but i'm scared of causing more damage to something.

#2 4 years ago

BAD

BC_Gambit

PinMod Industries

Unknown

11y 70,550 3,532

Probably a coil stop or other part mis aligned and the plunger is not solidly contacting the coil stop. Make sure your Eos switchnis gapped properly and opening or closing as appropriate. Look at the other flipper and compare.

Also make sure there is some vertical up and down play for the flipper shaft. If there is no play you may be losing energy to binding. Start there and look at the dozens of flipper rebuild info stories that must be documented on the web.

#3 4 years ago

TYM

illpoet

Inactive member

ok thank you i will look at that and search for more flipper rebuilds.

#4 4 years ago

DEC

GRUMPY

Pinside member

10y 95,050 8,699

OP
Quoted from illpoet:
The one that worries me is that it buzzes when i hold it.

Is the coil loose? Is the coil stop at 90 degrees?

#5 4 years ago

???

pinmike

Inactive member

Bossier City, LA

13y 56,600 5,368

You may have to adjust the EOS switch

#6 4 years ago

TYM

illpoet

Inactive member

Quoted from GRUMPY:
Is the coil loose? Is the coil stop at 90 degrees?

Coils not loose and the stop is at 90 degrees. I've got some time off tommorrow I'm going to go over everything again.

#7 4 years ago

TYM

illpoet

Inactive member

Quoted from pinmike:
You may have to adjust the EOS switch

That's what I'm gonna look at first. When I went over the rebuild the eos was the one thing I was a little iffy on. It is closed at rest and open at full but maybe not open enough.

#8 4 years ago

DOZ

dozer1

Pinside+ Addict

This is probably not it, but something to check non the less. There are like 3 different coil stops used in system 11's. If you have the wrong one, your plunger might not be bottoming out on it. You might just be fully compressing the conical spring and there is a gap between the plunger and coil stop. That might cause such a hum.

#9 4 years ago

DOZ

dozer1

Pinside+ Addict

The plunger link should look like the first pic if you use conical springs, (like you did). That could also be all that is wrong. The later style link like in pic 2 might not be allowing enough room for the conical spring. If you convert to much better extension springs, either link will work.

medium (resized).jpg

medium (1) (resized).jpg

#10 4 years ago

TYM

illpoet

Inactive member

Heres a picture of the plunger and the old one. They look the same to me on the coil. Arg I blew my last fuse

20200106_200538 (resized).jpg

20200106_200603 (resized).jpg

#11 4 years ago

TYM

illpoet

Inactive member

Does blowing a fuse mean I have it wired wrong? I know I wired it wrong the first time, because it blew a fuse right away and never worked. They worked for a while this time heh.

#12 4 years ago

TYM

illpoet

Inactive member

Plus I'll look into converting to extension springs.

#13 4 years ago

DOZ

dozer1

Pinside+ Addict

When you have the play field up and are working the mech manually, does it bottom out on the spring or does the plunger smack the coil stop nicely? Here is a pic of a police force playfield underside. Not sure if it is any help on the wiring question.

c125398f188a6bb18e41c335f740c3d8ce62b5ab (resized).jpeg

#14 4 years ago

DEC

GRUMPY

Pinside member

10y 95,050 8,699

OP
Quoted from illpoet:
Does blowing a fuse mean I have it wired wrong?

If the plunger link binds on the return spring, the flipper bat didn't rotate as far as it should have, the EOS switch didn't open up completely drawing to much current and burning the fuse.

#15 4 years ago

TYM

illpoet

Inactive member

i readjusted the eos today, hopefully my replacement fuses will show up tommorrow. hopefully that fixes it.

#16 4 years ago

DOZ

dozer1

Pinside+ Addict