if you don't know what normal operation is you're not really troubleshooting, you're no different than a pig rooting for an acorn.  They often find the acorn but they also spend a lot of time rooting and find nothing. 🙂
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My earlier post was not intended as a "put-down" to anyone.  My point is that to troubleshoot anything, electronics or otherwise,  you need to know what "normal" operation is in order to identify a fault.  Almost anyone can troubleshoot anything if they know what "normal" is.  Even for a flat tire, "normal" is no leaks in the tube and the valve stem is not leaking.  Troubleshooting requires checking each to find the problem.  Troubleshooting an engine or computer gets a bit more involved but you still need to know and understand "normal operation".  In my many Xerox training classes the course manual began each chapter on each system in a machine with "Theory of Operation" that was read and tested on before anyone went to the lab to troubleshoot equipment.  Nothing wrong with rooting as long as you don't do any damage.  I've fixed a lot of things that way but I wasn't really troubleshooting.  🙂

I started my career with Xerox working on their very first model, the 914, now in the Smithsonian museum , and ended on this one. https://xeroxnostalgia.com/2019/07/23/xerox-5090/.  The crypto equipment I worked on is also in the Smithsonian museum and my military uniforms in the museum in my home town.  I'll be in the museum soon myself.

Larry Flesner
P.S. The P.A. is set up at Mt.Vernon for the Gathering and details for the Saturday evening event with the restaurant confirmed.  Don't forget to leave a note for the family so they know where you're at when you come up missing in two weeks.

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