Quoted from spidey:Are the flippers always weak or do they get weak as the game goes on? Do the coils feel really hot when they’re weak? A common problem of weak flippers is the flipper opto boards. If they’re intermittent they cause they primary coil to fire when the flipper is up and the hold coil is supposed to be on. Primary coil gets hot and weak. The whole reason for having two coils is to not overheat the main coil.
Go into switch test and hold the flipper buttons in and see if you get flipper switches firing.
In test switch mode pressing the flipper buttons registers the full sequence for flipper. I didn't try touching the coils but I will the next time I've got the game on. The weakness appears on maybe a second or third shot, first one after a bit usually works well. Perhaps promising...
Just as an update - I checked and cleaned the flipper optos, and additionally replaced the remaining original one with a new one ( so now both flipper opto boards are gulf repros and there are 2 black diverters). This did not make a difference.
I refurbished just the top right flipper, as that's the one that was really hard to make it up the delta ramp. As you may know the flipper kits do not include the bushings, so those got ordered and I replaced that one and checked everything else was clean and good. No drastic improvement on performance. I went through and refurbished the bottom pair too including coil sleeve, EOS, pawl, bushing. Not much improvement there either.
I also replaced the trough board as the infra LEDs on there were looking tired and there was signs of previous repairs - this was a long shot because the original board was working appropriately. No change on flippers either.
Noticed the coils are FL11629 on right side flippers, FL-17636 on left. They all feel weak so I'm thinking the coil difference is probably not it.
Any other ideas?