TECH: Bally Flipper coils, wiring and diode orientation

[Guest]

Archived from groups: rec.games.pinball (More info?)

I am trying to solve a wierd coil problem, a flipper coil that will not
fire. Does the orientation of the diodes and low/high resistance coil
wires matter? That is, should the anode side of the diodes be lined up
with the 'low' lug or 'high' lug?

Thanks!!

 

[Guest]

Archived from groups: rec.games.pinball (More info?)

>I am trying to solve a wierd coil problem, a flipper coil that will not
> fire. Does the orientation of the diodes and low/high resistance coil
> wires matter? That is, should the anode side of the diodes be lined up
> with the 'low' lug or 'high' lug?

Which game? Series or parallel wound coil?

Look in your manual, there should be a wiring diagram for the flippers.

--
Mike S.
Kalamazoo, MI

Gameroom: http://tinyurl.com/4hfev
W C S Owner's List: http://tinyurl.com/39cjo
M B Scoop Repair: http://tinyurl.com/9lfu
--------------------------------------------

 

[Guest]

Archived from groups: rec.games.pinball (More info?)

Flash Gordon, this is the upper flipper, which has been giving me fits.
It works, it doesn't work, it works, it doesn't work. Now, it's
completely dead. Won't fire in test or when grounded. Everything is
new except the coil, and maybe that is where the problem really lies.

 

[Guest]

Archived from groups: rec.games.pinball (More info?)

Here's how the diode and coil windings are oriented

LUG #1 - THICK wire from coil winding, non-banded end of diode 1 (
diode between lugs 1 to 2),

CENTER LUG #2 - BOTH thick and thin wires from coil windings, banded
end of diode #1, NON banded end of diode #2 (diode from lug 2 to lug
3), and one wire from EOS switch.

LUG #3 - THIN wire from coil winding, banded end of diode #2, another
wire going to EOS,

Bob Stemmler

 

[Guest]

Archived from groups: rec.games.pinball (More info?)

> Flash Gordon, this is the upper flipper, which has been giving me fits.
> It works, it doesn't work, it works, it doesn't work. Now, it's
> completely dead. Won't fire in test or when grounded. Everything is
> new except the coil, and maybe that is where the problem really lies.

Well from my experience coils, in and of themselves, either work or they
don't. Measure the resistance of the coils. Open coil will measure
infinity ohms, shorted coils will measure 0 ohms and good coils will show
some resistance value.

Could definately be the coil, but also sounds like a connection problem
either at the lugs on a connector to the board or a bad flipper switch. I
don't think this games used transistors to drive the coils, so it rules that
out as a possible suspect.

Swap left and right coils and see if the problem moves. Did you have this
same problem before you rebuilt everything? If so, then I'd be checking
elsewhere on items you didn't work on.

--
Mike S.
Kalamazoo, MI

Gameroom: http://tinyurl.com/4hfev
W C S Owner's List: http://tinyurl.com/39cjo
M B Scoop Repair: http://tinyurl.com/9lfu
--------------------------------------------

 

[Guest]

Archived from groups: rec.games.pinball (More info?)

Thanks - it's wired properly. Guess it IS time to change out the coil.

Cheers!!
Bob