Hey all! Can't believe it took over a year to make my first post here. I made this account just before putting the money down on what is now my studio's 6056 E, and just now I've got time to join the community
So, this 6000 came to us in rough shape, and the service manual is beat up and missing a fair number of pages (not to mention more than half the DL snakes missing, no card or board extenders, crimp tool etc). The previous owner and tech did a few really janky things to it that we've since undone. Most of the console has been taken care of now, but one problem in particular has been sticking around: The B bus won't pass signal, it's O/L light is always on, and it seems to be trying to output DC to the master bus. But of course, the manual is missing
every single schematic for the 688v with the exception of the 256 card (which is the original print... go figure).
I could get as far as isolating the fault to the 157b, before one of the quad op-amps, but without the schematics I'm stumped. I'd be eternally grateful if someone has those schems kicking around on their computer and could share them!