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12vMM..what does it mean?

Discussion in 'Datasheets, Manuals and Component Identification' started by jpx72, Nov 12, 2015.

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  1. jpx72

    jpx72

    4
    0
    Nov 12, 2015
    Hello guys
    I am in need of figuring out what this writing means on a fruitmachine schematic:
    12vMM 100Hz REF

    I am uploading two pages of the schematics manual where this "input" is mentioned.

    Can anybody help me?
     

    Attached Files:

  2. Minder

    Minder

    3,003
    638
    Apr 24, 2015
    12mm appears to be reference to an off board connection which supplies 100Hz at a 12v level.
    It monitors the health of the power supply and if the 100Hz is not present resets the watchdog timer.
    That is the way it seems with a brief scan.
    M.
     
    Last edited by a moderator: Nov 12, 2015
  3. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Please post the power supply page with the 12vMM signal.
    BTW,
    It looks like a truly terrible design...:(
     
  4. jpx72

    jpx72

    4
    0
    Nov 12, 2015
    That's the problem, the power supply schematic doesn't show this pin at all(pin12 on the power connector). Uploading the whole thing...later
     
  5. jpx72

    jpx72

    4
    0
    Nov 12, 2015
    Sorry I have been away so long, I had to cut out the needed pages from the manual out, because the whole file was too large. I am uploading the pages regarding the power supply. I am still stuck on this problem. Thanks for any answer!
     

    Attached Files:

  6. Alec_t

    Alec_t

    2,882
    770
    Jul 7, 2015
    12VMM is shown top right of the schematic, but there is no connection shown to Plug 2. It is a crude full-wave rectified, unsmoothed mains-waveform. Perhaps 'MM' denotes 'mains'? I agree with Minder, post #2.
     
  7. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    It is clear to me now.
    The MM means Mains Monitor, that simple.:rolleyes:
    The signal is the "pulsating" full rectifier output(before filtering).
    For a 50Hz Mains it is 100Hz.

    Used as a HW WD to constantly discharge C8 (with the SW WD).
    See PIC

    12VMM.jpg
     
  8. jpx72

    jpx72

    4
    0
    Nov 12, 2015
    Thank you guys for your answers, especially the last one!
    I hope I will be able to get this from my power supply, will write more when I'm done. ​
     
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