Electronics > Beginners
Cheap oscilloscope for basic measurements
bauto601:
--- Quote from: Old Printer on December 23, 2018, 02:58:55 pm ---Most if not all of the transistors in that scope, and there are quite a few of them, plug into sockets, like many scopes of that era. At three legs per that is a lot of potential bad connections to cause the type of problem you describe. Usually removing and reinserting the socketed components, with maybe a wipe of Deoxit, is a first step in rehabbing an old scope like that, which in itself would be a great learning experience.
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Just read the story that they plug in sockets so they can be swapped easily because not every transistor met the specifications that were needed for this scope. I will take a look at it some day, i unfortunately don't have the time for it right now.
tggzzz:
--- Quote from: bauto601 on December 23, 2018, 12:53:25 pm ---
--- Quote from: tggzzz on December 22, 2018, 08:45:09 pm ---Don't automatically assume the 465's problems are a bad solder joint: there are other failure mechanisms.
There are may internal connectors, one of those may have oxide coatings or be a little dirty. Easy to fix.
Many of the controls have strange (by modern standards!) switches consisting of exposed gold contacts that are pressed against the PCB. These can get dirty, and can be easily cleaned - or damaged :)
The vertical attenuators can become flaky. If it is just the external contact then that can be fixed, but internal contacts are more troublesome.
Or, of course, there could be a problem with the electrolytic capacitors.
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And there you go, it maybe this, or this, or even that. ;)
The problem is that it doesn't react to any input or even any button. It just displays a flat line above the horizontal center line until you hit it on the top. Switching channels also doesn't do anything. After that, everything works fine. Except for the calibration and the other issues.
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At least you have a non-intermittent problem. I once had a scope with a semi-crap capacitor that, when turned on, failed for 60s twice a day. Turning it on more often made the problem disappear.
Think of it as a more interesting and profitable pastime than crosswords or soduku :)
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