Question about notation used in a schematic for ADM-3A

Discussion in 'The Projects Forum' started by stragulus, Dec 17, 2017.

  1. stragulus

    Thread Starter New Member

    Feb 9, 2016
    10
    1
    Hi, I've been debugging an ADM-3A serial terminal for a while. When studying the schematics, I found some notations that I do not know what they represent. As an example, please see this image here that I cropped from the maintenance manual:

    adm-3a schematics sample.png

    What does the 280 here represent? It doesn't seem like a standard notation. Nor can't I figure out from the context what it means. Maybe it's just something internal to the manufacturer, but maybe it's a hint that I'm missing. Anyone knows?
     
  2. nsaspook

    Expert

    Aug 27, 2009
    5,948
    6,724
    This:
    Screenshot_20171217_131024.png
     
  3. stragulus

    Thread Starter New Member

    Feb 9, 2016
    10
    1
    Ah, that explains that. Thanks!
     
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