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Floppy Emu Hardware Failure Analysis Results

61 points · 10 comments · zdw

  1. sdcfgy · · focus · HN ↗
    Crystal failures are always a problem. We used to chuck a bag of them in a tumbler for an hour then on a tray on a vibration table for an hour. About 20% would fail on test from being entirely open circuit to being way off frequency.
    1. snvzz · · focus · HN ↗
      Did they ever fail short?
      1. sdcfgy · · focus · HN ↗
        Nope.
        1. snvzz · · focus · HN ↗
          How about drawing significant power while not producing a clock? (output is flat high)

          And if you touch the board, applying pressure just right around the area, it actually does produce a clock.

          (the output is not even connected, only my oscilloscope at the other end of the trace)

          I will probably try and re-solder the oscillator next.

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