I recently picked up a Juke Box (my first machine so far) that was mostly non-functional when I got it home; the score relay runs forever on startup, but manually activating the reset relay allows a ball to kick out and the game to be played.
However, the flippers are exceedingly weak; I can barely hit a ball up to the middle of the opposite slingshot, let alone up the playfield. When I hold either flipper, it doesn't make it to EOS and just wobbles in the middle of the stroke (I don't hold it for long, for I don't want to burn out the coils.) If I manually move the flipper up to EOS and then press the button, it will sometimes stay there, but sometimes not (as if the hold coil isn't strong enough to overcome the spring.)
When I picked up the game, the flipper coils were disconnected. I have since attached the appropriate wires where they belong, and I am seeing a solid 30V AC at the power lugs. I also completely disassembled the EOS switches and cleaned them, so the contacts are now shiny and bright. While I had the coils out, I noticed that custom brass coil sleeves were in place, so I replaced those with nylon, and now the plungers move smoothly through the coil when hand-activated.
Does anyone have any insight into why the flippers would be so weak? I have searched around, but so far nothing seems to be helping.
Thanks in advance.