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Schematic For Marshall MG 250?

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  • Schematic For Marshall MG 250?

    I've got a Marshall MG 250 on my bench. Anyone got a schematic.

    The repair tag says "Replace R107". R 107 is gone, two leads stick up out of
    the circuit board.

    Any help is very appreciated.

  • #2
    R107 - 5w 0.1 ohm. if that is burnt up, then the power module associated wth it is probably as well.

    The schematic is posted at www.ampix.org in the Enzo gallery.
    Education is what you're left with after you have forgotten what you have learned.

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    • #3
      Enzo,

      Once again, thanks for the schematic. Do you recommend just replacing the TDA7293 in that module or should I checking other things as well.

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      • #4
        I recommend finding out what is wrong. That resistor would have to have a reason to fail, and since it is in the return leg of the speaker, I can think of nothing that would cause such a failure other than DC on the output - which in this case means bad 7293. I mean, disconnect the speaker and see if there is DC there. Replace the resistor first.
        Education is what you're left with after you have forgotten what you have learned.

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