Intermittent weak flippers on STTNG, could it be LM339

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

I really doubt it's a LM339. Do the basics, clean flipper button opto
boards. Check plungers for a sharp edge or wear dragging inside the coil.
Then any connectors involved from the transformer to boards to coils, make
sure you don't have a loose connector. LTG

"heckheck" <jsurf@heckheck.com> wrote in message
news:1122675241.530417.272870@g47g2000cwa.googlegroups.com...
> OK, so I'm going to try to diagnose this this weekend. I've read the
> Marvin site, and don't think it's run of the mill sticky parts. The
> weakness started some time back in the right flipper. Recently it
> spread to the left flipper. The upper right flipper has seemed fine
> straight along. Now what's strange is that this seems intermittent.
> First thing I will try is cleaning the optos, but does this sound like
> failing LM339's on the Fliptronics board?
>
> I went to play this morning, and all flippers seemed to have decent
> power. After half an hour of play the left flipper coil seemed warm
> (warmer than the right), but not hot.
>
> I guess I will start with a rebuild to rule out mechanical issues, but
> is there any good way to be sure it's the LM339's or not? I was going
> to swap optics boards, to rule bad opto out, but I currently don't have
> the problem happening.
>
> h_h
>