I do replace bridges more than on other brands. There is no documentation for them, they are replacement only, though you could probably identify bad parts on them and replace them without drawings. Now and then the little sm modules go bad. I have fixed my share of blown channels, they tend to be straightforward, shorted power xstrs and IRFZ44s.
The schematics and layout are there, plus a theory section and some good troubleshooting. MAke sure to ask for the complete model name, don't leave off the littel a at the end. What you need to do is get the service manual from QSC. Just my karma, nothing electronics about it. My experience with the larger QSCs is that in the twin board models, it is inevitably the one underneath that fails. I need to see if they have my updated address come to think of it. I don't see them as often as I used to, but I was an authorized QSC service center. Thanks in advance for any suggestions on this. cap failure, output relays bad, solder problems, or certain parts of these amps that commonly give a headache? They are certainly beginning to cause some big headaches around here! Has anyone out there that also services these amps seen any common problems with them.
I'm getting tired of sending these back and forth to either QSC or the local service center and would prefer to start repairing them myself to effect a faster turn around and less service trips to remove end then install a loaner amp and then re-install the customers repaired amp and so on. Most are about 10 years old and many of them use the built in QSC X-over card as most of the systems they're in are bi-amped. Some have had shorted bridge rectifiers and some just seem to drop a channel and the result is no output, but that channels circuit seems to be operating just fine. There are alot of these amps in use in movie theatres in my servicing area and we are starting to see many failures of them.
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