M&M MP175 Mixing deck

[Turnip]

Hi folks,

Have one of these old '70s mixers in to try mend. Problem is that one of the twelve channels doesn't work.  Spent a while comparing the eleven identical boards but found nothing obvious.

Wonder if anyone has a shematic - gather M&M expired some while ago. Thanks - Chris.

Later - Noticed 2 x CA741CG Op Amps on every panel. Chap on Fleabay said TL061CN were much the same, so fitted some and found chip voltages dubious, and panel didn't work. Moved a pair of CA741CG from another panel to the faulty one - well OK. Gone now for some LM741 for another try as originals are Hen's teeth. LM741 Chips fitted - OK - Job done.

Out of interest, one of the duff panel's 9 controls had a leak to chassis, sorted after dissembly and clean.