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  1. gerryt

    QSC Power Amp gets hot

    By each amplifier do you mean channel and channel two?
  2. gerryt

    QSC Power Amp gets hot

    Thank you for all of your input, I will do some more testing. I have also discovered that Q2 in the schematic also gets hot. Thinking I might need to replace Q1 and Q2 as a matched set. Or, wondering if there is a bias problem causing Q4 to do most of the work.
  3. gerryt

    QSC Power Amp gets hot

    What I tested was the two wires (blue and white see the attached photo) that go directly to the output transistor on the heat sink. I disconnected the wires from the output transistor and then turned the amp on and connected each wire to my multimeter on the auto DC voltage setting. Channel...
  4. gerryt

    QSC Power Amp gets hot

    A bit more information that may or may not be relevant. I tested the DC supply to both channel one and channel two output transistors. The reading going to channel one output transistor was 1.18 and reading to channel two output transistor was 2.77.
  5. gerryt

    QSC Power Amp gets hot

    Yes, both channels are working normally, channel two gets really hot, channel one does not
  6. gerryt

    QSC Power Amp gets hot

    I have a QSC Series One Model 1100 Power amp. It is working normally, however on channel two the output transistors and heat sink get very hot. Wondering if this is a problem with too much current getting to them or if the transistors are failing? Channel 1 runs cool.
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