CM408T documentation for DIY repair

[Amelnik]

Hello everyone!

I have 3 Euphonix S5-MC consoles with 14 CM408T modules. They really old, and from time to time need some repair. Problem is - i have no schemes and it is really hard to find the problem block. For example, one of CM408T modules didn't respond to any button push or knob turn or fader move, but it connects to MC normally, all light are on, and if i move fader in DAW mixer - fader on module respond. So basically, i think there is problem with chip that computes the input from controls and transmits it to MC. But where is this chip? I have some spare parts, so i could replace it, only if i knew where to look.

So, my question: is it possible to get from somewhere the documentation for CM408T with schemes?

From Russia with Love,
Andrey