Macintosh 512k Boot Issue

Discussion in 'Apple Collectors' started by pl1984, Apr 24, 2019.

  1. pl1984, Apr 24, 2019
    Last edited: Apr 26, 2019
  2. MacTech68 macrumors 68020

    MacTech68

    Joined:
    Mar 16, 2008
    Location:
    Australia, Perth
    #2
    Try "zip"-ing the sound file first. Then the forum should accept it for upload.

    As for what's going on, it does seem that the particular analog board MAY be damaging logic boards. A picture(s) of that board may assist.
     
  3. pl1984, Apr 25, 2019
    Last edited: Apr 26, 2019

    pl1984 thread starter macrumors 68020

    Joined:
    Oct 31, 2017
  4. MacTech68 macrumors 68020

    MacTech68

    Joined:
    Mar 16, 2008
    Location:
    Australia, Perth
    #4
    That's a Mac that needs coffee ! o_O:rolleyes:;):)

    Standby whilst I consult notes - might be a little while - real life is getting in the way. :rolleyes::mad:

    Check the +5v rail at least
     
  5. pl1984, Apr 25, 2019
    Last edited: Apr 26, 2019

    pl1984 thread starter macrumors 68020

    Joined:
    Oct 31, 2017
  6. MacTech68 macrumors 68020

    MacTech68

    Joined:
    Mar 16, 2008
    Location:
    Australia, Perth
    #6
    One of two ways (using the chassis as ground) -

    1. Via the floppy drive port - may need to use a straightened paper clip if multimeter probes are too big:

    Floppy Port Voltages.png

    or

    2. via the Blue wire on the power/video cable that connects to the motherboard.

    Blue Wire 5 Volt crop.jpg
     
  7. pl1984, Apr 25, 2019
    Last edited: Apr 26, 2019

    pl1984 thread starter macrumors 68020

    Joined:
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6 April 24, 2019