HM203-4 analog CRT oszilloscope repair
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- Опубликовано: 4 дек 2024
- In this Video we repair my old Hameg HM203-4 oszilloscpe from the eighties which can't show a properly focussed trace anymore. And i also forget to lock the white balance on the camera to make cuts look extra bad :P
I've been given this a long time ago by my physics teacher. Playing around with it is what got me started with proper electronics projects. So it has quite the high sentimental value for me :D
Service manual for the scope can be downloaded here, incase you want to have a look:
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I worked on many of these scopes during the early years of my career. The one other advantage is for these old analog scopes is that they are very repairable. Unless the crt begins to weaken they can be serviced and can last forever. The sad thing is that one of these scopes in 1982 would set you back $500 or more Canadian dollars. What you can get today for that money is really amazing. Thanks for the trip back down memory lane.
As i figured out, there are 2 revision of XY boards in this model osciloscope. One is in Your repair movie with traditional capacitors(easier to replace in my opinion) and another with axis capacitors. little harder to replace. By the way, these oscilloscopes are very good and very repairable, made of good components. Beautiful things. Maybe in the next episode You try to calibrate this oscilloscope, obviously it's necessesary after all these years, of course after all these creepy old electrolytic capacitors replaced.
Sehr gutes video! mach weiter so und du wirst sehr erfolgreich damit! du hast mindestens 200k abos verdient. meins hast du :)
week 20 in 1982, that's like my birthday :)
It is SOOOOOOO easy to forget such a "minor" thing as turning the equipment on. Being distracted by anything, such as explaining your troubleshooting method, is not a good thing in most cases. But great vid! I'm pretty much a self taught person, and I definitely like to see how others employ their troubleshooting skills.
Glad you liked the Vid :)
But yeah the distraction was actually something that put me off doing this sort of video for the other, more complicated, repairs I did in the past. Trying to explain what you're doing at the same time as actually doing it and thinking about wether what you are doing is actually the right thing or not takes up a huge part of mental capacity (at least for me :P)
@@TMaxElectronics For sure! Thanks again!
Sir i have the same OSC but channel 1 not working any advice
I don't think you mentioned it, but the 5V regulator isn't actually screwed to the heatsink. That might be contributing to the issue?
I was surprised by that too, but if you look at the board layout in the service manual (page 31) you'll see that all of the other regulators are designed to be attached to the heatsink, but the 5V one is only on the board itself. No idea why they wouldn't just mount it anyway since the hole is there though.
Shouldn't that 5v regulator be making contact with the chassis as a heat sink!
My ex pushed my Telinstruments 25mhz off the bench, resulting in a similar fault to your scope.i am a sort of newbie to electronics but is there any possible way a heavy knock or hit could cause a charged electrolytic cap to shit itself suddenly , especially if it was on its way out anyway?..sounds like a strange question but Einstein may have had an answer.
PeaceFromOz