| Electronics > Repair |
| HP/Agilent Infinium 548xx scope - Power Supply Schematic ! |
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| bostonman:
Someone on here suggested I use a wire brush to trace connections. It worked quite well and got me to the general location which I then used a probe to get the exact location. It wasn't easy, but I managed to trace a few circuits in question. |
| asis:
--- Quote from: Conventional Wisdom on January 12, 2024, 03:21:14 am ---If you're one of them, I have good news: I'm an engineer, I'm retired, I'm stubborn and I don't like secrets. --- End quote --- Hi, Exactly 20 years ago I did the same thing, letting the bird out of the cage. Since then, I have reverse engineered dozens of complex circuits for various equipment. Unfortunately, altruism and selflessness did not make me richer. The only thing that brought me satisfaction was the experience gained and understanding of how everything works. You are very close to me. Thank you. - I am grateful to this forum and its creators for the opportunity to communicate with all of you. |
| bostonman:
--- Quote ---I am grateful to this forum and its creators for the opportunity to communicate with all of you. --- End quote --- Not to deviate, but I fully agree on being grateful for this site. I owe some complicated repairs to this site that otherwise would have been too complicated to solve without input from others; one of them being my Agilent 54831M scope. I am also grateful for the general knowledge I've gained. It amazes me that I post a question, and within a short time see not only many users viewed the message, but almost always provide a response in a short time. Sometimes I sense people butt heads a bit, but it's impressive how users from around the world all come together to help others who they never met. |
| Conventional Wisdom:
Hello asis, Great job on the Delta power supply schematic. The package reference diagrams are a nice detail. "The only thing that brought me satisfaction was the experience gained and understanding of how everything works." Absolutely true. [old-fart-mode] Formal education is a fine thing, but I think it's also important to learn by example. I've been reverse-engineering electronics since I was a pre-teenager, sometimes for a practical purpose such as repair or improvement, but more often out of simple curiosity. I was fortunate to grow up in an area and at a time when there were nearby shops overflowing with aerospace and military surplus at dirt-cheap prices. I'd buy interesting items to take home and learn everything I could about how they were designed -- everything from PCBs bristling with TO-39 transistors, silvered-mica capacitors and pulse transformers to a suitcase-sized digital voltmeter with a 3-digit Nixie readout, all-relay logic and a stepper switch sequencer -- and then I'd use the parts to build something else. Obviously, I didn't earn any money doing it, but I can say with confidence that all that "play time" gave me the perspective and knowledge to be a far better and more valuable "out-of-the-box" thinker later on. I'm sure there are many here who share these sort of experiences, and in an age where writing a little Arduino code constitutes invention, it is gratifying to me to see so many young people here down in the trenches with the soldering irons. [/old-fart-mode] The TOP200 on your schematic caught my eye, so I had to look it up. See what I mean about curiosity? :D |
| Conventional Wisdom:
Just a quick update to close the loop: This rev-2 schematic corrects some minor goofs (e.g., missing SHUTDOWN_N signal at 9/D2) and renames the output voltages to match the values in the service manual (+12.2V instead of +12V, etc.). |
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