Question about QSC ISA 300Ti Amplifier

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QSC ISA 280 Stereo Power Amp stopped working

My QSC ISA 280 Power amplifier stopped working. When I turn it on the Power LED turns on but the signal LED's don't react to the input and the Speakers let out a soft hum no matter the volume of the input (or if there's input at all). At first this would happen and the power amp would start up after some time, but now it just stays in this state.

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This is a very precise questions as QSC amp are pretty rare and high end electronics equipment. There is no way getting an answer other than getting the amp at a sound shop for repair, wich might go for a visit at QSC anyway. From a sound shop repairman...

Posted on Sep 08, 2009

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I am a Pro Audio/Video Installer... I certified by QSC and install their products regularly so I must disagree with the previous solution by saying MOST sound shops will not delve into this... Most shops or QSC themselves usually recommend replacement. My best advice is try to isolate the problem Input side vs. Output side. Start by unplugging everything from the amp both speakers and your inputs. Then plug in each channel for speakers individually to see if the problem is following a channel. If you do not find the "hum" at this point when each channel is tested individually and then together, your outputs should be ok but still more testing... Now plug in individual inputs... ALL to be exact 1/4" TRS, spade terminals and XLR's. Continue this to isolate the problem... if no single channel IN or OUT can be identified then the unit probably has much more problems internally and trust me the cost of Repair VS. Replacement would find you replacing much more cost effectively! I hope I helped!

Posted on Aug 10, 2011

  • Nick Bellos
    Nick Bellos Aug 10, 2011

    I am a Pro Audio/Video Installer... I certified by QSC and install their products regularly so I must disagree with the previous solution by saying MOST sound shops will not delve into this... Most shops or QSC themselves usually recommend replacement. My best advice is try to isolate the problem Input side vs. Output side. Start by unplugging everything from the amp both speakers and your inputs. Then plug in each channel for speakers individually to see if the problem is following a channel. If you do not find the "hum" at this point when each channel is tested individually and then together, your outputs should be ok but still more testing... Now plug in individual inputs... ALL to be exact 1/4" TRS, spade terminals and XLR's. Continue this to isolate the problem... if no single channel IN or OUT can be identified then the unit probably has much more problems internally and trust me the cost of Repair VS. Replacement would find you replacing much more cost effectively! I hope I helped!

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