Hot Flipper Coil

[RatBag]

This one has me just about beat.Party Zone prefliptronics RHS flipper coil gets hot and after 4 or 5 games either frys or blows the fuse
what I have done to try and fix it
measured the resistance on the coil...good
swapped the coils over .....RHS still gets to hot
swapped EOS switch........RHS still gets hot
swapped cabinet button switches over.....still gets hot
changed capacitor ....still hot
checked all wiring connectors 50 times...all good
even swapped out driver board and ran new wires to coil,cab switch and EOS switch

ANY IDEAS GREATLY APPRECIATED

[wonder]

dont let Morrie near it.






Only joking got no idea

[MartyJ]

What are voltages to the coil like?

[ajlaird]

Hmm, you may have swapped the EOS switch, but have you checked it is operating correctly on the RHS?

I am guessing you have but the symptoms sound an awful lot like EOS not triggering correctly.

[RatBag]

What are voltages to the coil like?

75v same as LHS and yes EOS is opening and has good conductivity through it when closed

[ajlaird]

You can almost hear the head-scratching on this one!

[ddstoys]

Could you have the coil wired up wrongly?   So its using the full strength winding to hold the flipper up?

[RatBag]

Good point I thought so too but I have the hot wire going to the lug with both coil winding ends attached

[Ballywannabe]

Coil or EOS has to be wired wrong

Was the game like this when you got it, or did the symptom start after you did something else to the machine???  I have had coils that get hot due to internal shorts, but you seem to have covered this by swapping the known good one from the other side.

cheers
Ian

[RatBag]

Coil fryed after 3 games of it getting to our shed,have checked wiring so many times its not funny,hot wire to outside lug with 2 coil winding ends to it,other outside lug to one end of EOS and also up to driver board,centre lug to other side of EOS

[pinmadd]

check voltages with flipper button pressed,should be 10 or so volts to hold  the flipper up,try another fliptronics board,sound like coil is getting hi voltage to hold flipper which will burn them out pretty quick 

[shansta]

check voltages with flipper button pressed,should be 10 or so volts to hold  the flipper up,try another fliptronics board,sound like coil is getting hi voltage to hold flipper which will burn them out pretty quick 

Think he said it's pre-fliptronics? (like mine s/n:845041)

I am looking at one now...

Looking at the playfield raised up against the backbox:

RH Flipper coil wiring:

Top lug: Dark Blue with yellow dot.

Middle lug: Aqua to EOS switch and loop wire to capacitor.

Bottom Lug: Dark Blue with Purple dot.
                 Aqua to EOS & solid wire of capacitor.

S.

[pinmadd]

i gota stop skim reading 

[RatBag]

After a bit of quiet time at the shed today its fixed, it was an extremely worn flipper pawl causing the problem,with the playfield in the upright position activating the flipper the EOS would open no worries and stay open but when the playfield was back in its rest position the weight of the flipper bat and pressure on the EOS would close it again causing the coil to heat up,in hindsight probably should of picked it up earlier

[Ballywannabe]

Well done Gibo, tricky one there.  I always check EOS operation by pushing the slug in rather than moving the flipper bat, but I am not sure this would have helped in your situation?

Have to ask, however, how you were frying coils rather than blowing fuses - didn't have a nail in there instead of a fuse did you

cheers
Ian