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Soundcraft DCP 100 PSU schematic

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  • Soundcraft DCP 100 PSU schematic

    Hello,
    I have a Soundcraft DCP100 PSU which is creating a hum. R5 is burnt out and unreadable, it is connected in parallel with a cap between chassis ground and 0v. Has anyone got schematic or have a look inside one or give me an idea of a value from experience of this part of a PSU.
    Any help greatly appreciated
    thanks
    bce

  • #2
    It may be a 100 ohm resistor between circuit ground and chassis ground.

    That resistor being open should not 'create' a hum.

    Check each supply voltage for excess Vac ripple.

    If they are steady then the PSU is more than likely not the problem.

    (Sounds like you had a ground loop issue that took out the resistor)

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    • #3
      Thanks,
      because of its age I have already replaced all electrolytics in the psu with new ones, it ran quiet for a few hours, then when hum started I noticed R5 burnt out. I rechecked board for shorts etc and all is ok. I ran the desk with a known good PSU (not a DCP100) and all was quiet. The only bands on R5 that I can see are a red at one end and gold at the other, then all is burnt black in the middle.

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