I have to troubleshooota few input modules for my Yamaha PM2000, but
I'm a little lost on where to start. I have the sevice manual, and I
went through the wiring, and everything seems fine, sooooooooooo I'm
guessing the problems are tiher related to caps or the opamp(s). I
was hoping someone out tehre might be able to point me in the right
direction on what to check and how.

One of the modules dies while I was using it. The input just stopped
woring. I can very faitly hear it, if I crank the gain all the way,
but it's really fuzzy and ditorted.

The other three will only respond to very percussive high-spl signals.
Like hitting the 57 with my finger. other than that, I'm not
getting anything out of it. Any help would be greatly appreciated.
Thanks!

-Chris