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  1. gerryt

    Help Reading a Schematic

    I am working on the pre amp/power amp board connections for a Mackie SRM150 personal monitor. Is there someone who might be willing to help me read the schematic? I am still learning about how to do this better. I need to put a different pre amp into the power amp as replacement boards for...
  2. gerryt

    Electro Voice SXA Powered PA Cabinet - Baffling Loud Hiss/Static

    I have an Electro Voice SXA 100+ powered PA speaker with a peculiar problem. At times i get a loud fuzzy hiss/static through the tweeter. There is no hiss with the woofer speaker. I tested the tweeter horn driver by connecting it to another amplifier and it works fine. My research online...
  3. gerryt

    Preamp output very weak

    I am attempting to repair a Yorkville KW100 (schematic attached). When I plug a music source into the return input which goes directly to the power amplifer section of the unit I get a clear loud musical output from the speaker. However when I plug the same music source into input channel one...
  4. gerryt

    Input Hum - Yorkville Amplifier

    I have a Yorkville Power Wedge Kw100 amplifier with two input channels. As the volume in channel 1 is increased there is a hum that gets louder. It does not sound like a 60 cycle hum. The humming problem is the same whether or not an instrument is plugged into the 1/4" input or a microphone...
  5. gerryt

    Switching Power Supply Short

    Hi all, I am trying to find a short in a SMPS for a subwoofer. It keeps blowing fuses as soon as the 120 AC power is turned on. The NTC Thermistor was damaged when I took a look at the board. Any suggestions as to what the most likely cause of this is?
  6. gerryt

    Carvin LM15 Powered PA Cabinet Protect Circuit

    I have a Carvin LM15 powered PA cabinet where the protect circuit light stays on when the unit is powered up. I have tested the woofer and tweeter to be sure they are working and have continuity. I have not been able to find a schematic for this unit and have contacted Carvin to see if they can...
  7. gerryt

    Solid State Bass Amp hums

    Everyone helped me so much to solve the overheating problem I had with my QSC Amp, so I thought I would ask for help again with another amplifier problem. I have a small Ampeg BA - 108 (first generation) solid state bass amp that hums continually and also presents a very small amount of...
  8. 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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