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Joe C

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About Joe C

  • Birthday 09/09/1962

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  • Gender
    Male
  • Location
    St. John IN
  • RealName
    Joe
  • Occupation
    Pipefitters Service Technician

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  1. MXR-130- I have an MXR-130 I’ve been trying to bring back operational and it looks like the last issue I’m having is when the FM is on and I press the asymmetrical noise reduction engage switch the, the FM goes extremely faint in the background and is totally distorted. The 4 hot resistors have been changed. I also noticed diodes D73-D76 are very hot. I’ve read about the hot resistors but don’t remember ever seeing anything about the diodes running hot. Any thoughts? Should I just replace the noise reduction board?

    FE7CE99B-5423-4106-BAF8-A69121514D85.jpeg

    1. Rob

      Rob

      What did you end up doing to get your bias voltages fixed?

    2. Joe C

      Joe C

      @Rob, it was a bad chip (IC-801) on the FEQ-508 board dragging down the +\-16vdc rails. I replaced the board but it had an issue with the switching chip IC802. I swapped out the 801’s and it’s off to the races.  
       

      On a roll, found the trouble with the noise reduction board as well. Shorted filter cap either C111 or C112 was draggy down the +/-12 feeding the board. I removed both of them and it fired up. Have new ones in order.

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