ST:TNG flipper bounce

[The Bagwan]

Hi all,

Not a major hassle, but I rebuilt my right flipper recently (new linkage, sleeve, plunger, end stop and replacing EOS), and now if the flipper is up and the ball comes down with a bit of force it will force the flipper down before it seems to activate again and pop back up. This all happens in a split second. I opened the playfield and had a good look and all looks OK. In switch test i activated the flipper then pushed it down with a bit of force, but couldn't replicate the problem. The underside looked fine with the EOS activating at the same time as the left flipper. Any ideas?

Thanks guys,

The Bagwan

[beaky]

EOS might not have enough gap when flipper is up.

[The Bagwan]

Thanks Beaky, but the ST:TNG has a closed EOS, and its definitely closed, and seems identical in activation to the left EOS.

[rads]

The hold winding of the coil may be broken

[beaky]

Thanks Beaky, but the ST:TNG has a closed EOS, and its definitely closed, and seems identical in activation to the left EOS.

silly me. I only just rebuilt 3 of them.

[Strangeways]

Did this start happening after the rebuild ?

Check that the wires to the coil have not come loose. Could be the coil - an easy check would be to swap the LHS coil with the RHS coil and see if the fault follows the coil.

[Lloyd Olson]

Assuming the new parts don't have play in them, then clean your flipper button optos.
LTG :)

[bossninja17]

Check the little resister that is between one of the coil terminals. If the connection is broken, the flipper still works but you get flipper bounce.

[Skyntara]

I'm having this exact same problem with all three flippers on my STTNG.

If I hold the flipper button and then apply force by hand I can get to the point where it's kicking.

It's bad enough that if a ball rolls down and hits a flipper hard enough it can go all the way back up the playfield.

I've done a flipper rebuild on my two bottom flippers but nothing on the top.

Not sure about this resistor between the terminals, I don't seem to have one. Any more info on that?

Cheers

Clancy

[ajlaird]

I think it is a diode, not a resistor.

[Skyntara]

Well diodes I *do* have.

I guess I'll check em.

[swinks]

Check the gap between the flipper bush and linkage arm bracket under the playfield making sure there is a little bit of play. Also check this thread for coil and diode info.

http://aussiepinball.com/index.php?topic=6780.0

[Skyntara]

Actually rocking the FL-17636 proto coils which are stronger than the mighty FL-11629s.

Just very weird that all three flippers do it. I didn't rebuild the top one and it would be kind of weird for them all to fail in the exact same way right?

[Skyntara]

I tried wiring up a spare FL-11630 and it does the same thing, albeit a lot weaker. it's amazing how much physically smaller the 11630 is vs the 17636.

So if it's not the coil, what else could be causing it. When the ball kicks off the 17363 there's an audible click as it gets shot off.

[pinmadd]

Try cleaning flipper opto boards, or try another flipper pcb in backbox