HCA-2205 Overload Light on Amp #3

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  • jpg
    Junior Member
    • Mar 2007
    • 1
    #1

    HCA-2205 Overload Light on Amp #3

    Had a strange thing happen last night to my HCA-2205. I was adjusting the H.F. horn attenuator on an Altec Valencia crossover and a spark zapped between my arm and the horn. Now the 3rd amp channel doesn't work - dead silent output, and the overload LED is lit. Measured the speaker, it's at 4.5 ohms on the amp input side, and when you adjust the L-pad to the bottom for the horn, it jumps to zero. I think that's what took out ch# 3. Pulled the cover and both fuses on the board (rear middle of the amp) are good. Any easy solutions to this, or did I take something out? Does anybody have a copy of the schematics?

    Thanks!! Jim
    Tags: None
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    • Peter Nielsen
      Super Senior Member
      • Sep 2004
      • 1188
      #2
      Sounds like you zapped one of the mosfets. One of them is probably short to the + or - rail. The resulting DC output triggers the overload light.

      Peter
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