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Idle current set

Discussion in 'Audio' started by heALer, Oct 4, 2018.

  1. heALer

    heALer

    3
    0
    Oct 1, 2018
    Maybe a stupid question. But my first time trying to adjust the idle current. The schematic says it should be 13mV on mp 701/702 and mp 1701/1702.
    Should I put the positive lead from multimeter on mp701 than the negative? If I ground the negative from multimeter I got 20v, so I think I'm doing it very wrong. :)
    Image from schematic:

    20181004_115029.jpg
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,690
    Jan 21, 2010
    Place the positive multimeter lead on MP701, and the negative on MP702.
     
  3. Audioguru

    Audioguru

    2,555
    576
    Sep 24, 2016
    Positive on MP701 and negative on MP702 with no signal and the multimeter set to measure DC volts.
    13mV on two series 0.47 ohm resistors is a current of 13.8mA.

    Is the amplifier rated at 20 real Watts into 8 ohms per channel? It might say 40W to 60W max or peak.
     
  4. heALer

    heALer

    3
    0
    Oct 1, 2018
    Thanks that worked.
    according to service manual:
    nominal output power 2x20w
    music performance 2x30w
    2 speakers 4-16 ohm

    Its really old, I use it for the turntable
     
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