NAD C541 Cd player Negative rectify ?

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  • Sevenqi
    Badcaps Veteran
    • Jul 2011
    • 292
    #1

    NAD C541 Cd player Negative rectify ?

    Anyone know how this negative rectify works ? This schematic is from NAD C541 CD player, the input is around ~ 15v to 17v AC, output should be -22V, but I only got around -11v. I checked the capacitor diode, or resistor they all looks OK.
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    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31010
      • Albion
      #2
      Re: NAD C541 Cd player Negative rectify ?

      d510 acts as a voltage regulator.
      what voltage goes into the transistor?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: NAD C541 Cd player Negative rectify ?

          It's a charge pump voltage doubler. Check the diodes and capacitors. A failed diode or capacitor will disable the doubling function.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

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