Fan speed a8n-sli premium goes wild

Discussion in 'Asus' started by dick, Sep 24, 2006.

  1. dick

    dick Guest

    I replaced the CoolerMater case fan with a papst 8412 N2/GLE, but the
    indicated fanspeed is now not stable anymore (values between 300-16000).
    Could it be that the MB (bios) has problems with low speeds, or is it
    the tacho signal! The fan seems to run OK.
    Anyone experience with this...

    dick, Sep 24, 2006
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  2. dick

    Paul Guest

    Probably the fan tacho signal is not being reliably detected.
    The RPM measurement is done by measuring the period between pulses,
    and the crazy values could be due to the fan signal not triggering
    the RPM circuit properly. You'd need to look at the signal
    with an oscilloscope to validate the theory.

    Paul, Sep 25, 2006
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