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» Film-Tech Forum ARCHIVE   » Operations   » Digital Cinema Forum   » USL CM-680 - no stage channels except when corssover is in Bypass

   
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      Profile for Ken Lackner   Email Ken Lackner   Send New Private Message       Edit/Delete Post 
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 I contacted QSC about repair of the monitor, but they informed me that the unit is obsolete and no longer supported.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? [Big Grin] Anyone have any suggestions on what to look for?

(Paging Harold!)

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Harold Hallikainen
Jedi Master Film Handler

Posts: 906
From: Denver, CO, USA
Registered: Aug 2009


 - posted 12-31-2019 04:11 PM      Profile for Harold Hallikainen   Author's Homepage   Email Harold Hallikainen   Send New Private Message       Edit/Delete Post 
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

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