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Author Topic: USL CM-680 - no stage channels except when corssover is in Bypass Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 12-31-2019 01:45 PM                     I've got a CM-680 that does not pass any stage channels except when the crossover card is flipped to Bypass mode. Because of this, I initially suspected the crossover was at fault, but if I install this crossover into another monitor, it works just fine, and another crossover or a crossover bypass card in this monitor produces the same fault. I contacted QSC about repair of the monitor, but they informed me that the unit is obsolete and no longer supported. So I figure I could crack it open and see if there's anything I can do to try to repair it myself. What's the worst that could happen, I break it even further? Anyone have any suggestions on what to look for? (Paging Harold!)  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 12-31-2019 04:11 PM                        The CM-680 was designed before I joined USL. I;m working on finding a schematic. If all channels died, I'd suspect something in common to all the channels, like the power supply. I'll see if I can find a schematic! Harold  |  IP: Logged

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