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No EQ on Trace Elliott GP12 SMX

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  • No EQ on Trace Elliott GP12 SMX

    This is a weird one.
    When the EQ is engaged the signal does not get through U5, which has it's 15v supply on pins 13/14 and 10/8.

    Even with chip removed, somehow 15v supply voltage is getting to the EQ sliders and output pins 14 & 8.

    Swapped U5, chip(s) ok, something is leaking voltage in that circuit.
    No obvious physical signs of any board problems, just strange.

    Signal level indicators not working either since they get their signal from this stage.
    Attached Files

  • #2
    You haven't mention the most important thing; do you have -15V power supply? The equalizer is supplied with +15/-15V rails. If the -15V rail is missing, I would say that the voltages you have are exactly as expected.

    Mark

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    • #3
      Yes, both 15v supplies good, all the transistors for each EQ band diode test okay and have correct voltages on them.

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