Twilight Zone
Bally, 1993I looked through the topics on this and couldn't nail down quite the right issue, so here I am.
Problem: while playing, the flipper quit working its full stroke and just twitches. All others are working fine and the flipper parts are new as well as the coil and switch.
Any help would be appreciated
It's one of 2 things.. EOS switch (doubtful) or flipper opto board.
Move the flipper opto board to the left and the left one to the right and see if the problem moves. If it does it could be a dirty opto or just a bad board
Just check your coil solder as well. I doubt this is it but check the flow and make sure all your connections are solid.
I swapped the opto boards and no change. I seems as there is a 50% voltage drop (didnt check with MM yet). The coil and power wires/solder are in great shape.
fliptronics board is all there is left. You have a high and low voltage circuit (and fuses there). Cold solder / cracked solder joints could make it twitch (only when the button is pressed though). However, these boards are pretty tough. If this board has cracked solder joints, I would suspect every board in that backbox and have to reflow every connector. It's never just one.
Well it seems as I ruled out Optos, fliptronics board, EOS and flipper parts so far. The coil "looks" new and has 70 VDC going to it... and is definitely an aftermarket one, the left flipper coil is an original Williams one and functions perfectly. If I press the flipper button and nudge the plunger it pulls it slowly forward. Frustrating! Thanks for the help so far..
Not yet but that seems by best option at this point. might as well do that tonight ...LOL Thanks Mr. Obvious 
That was it... swapped one out of my TAF... Many thanks for all your help!
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