[HN Gopher] Agilent 2000a / 3000a Oscilloscope NAND Recovery
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Agilent 2000a / 3000a Oscilloscope NAND Recovery
Author : sharpshadow
Score : 143 points
Date : 2024-06-19 13:20 UTC (9 hours ago)
(HTM) web link (salvagedcircuitry.com)
(TXT) w3m dump (salvagedcircuitry.com)
| pandemic_region wrote:
| This guy knows his oscilloscopes.
| aardvarkr wrote:
| I love seeing ridiculously technical investigations like this. It
| has zero relevance to me but it's just sooo satisfying to see
| someone solve a tough problem.
| a1o wrote:
| > the MSO adapter can accept low power signals up to 40v, but it
| offers no input protection when the host oscilloscope is off.
| Thus, if the DUT (Device Under Test) has a short of some kind
| near the area of probing, and the host oscilloscope is not
| powered, there's a good chance you've just damaged the Maxim
| MAX9201 comparators in the logic analyzer section of your scope!
| It's worth checking all 10 pins for voltages outside the MSO
| operational range.
|
| Whoa, it's been a long time since I haven't used these tools but
| I learned now I was very lucky when using because I didn't knew
| this and didn't check the voltages when using the logic analyzer
| in the scope I had at the time from Tektronix - which I guess had
| the same type of limitations.
| janice1999 wrote:
| If you like this kind of content, I highly recommend checking out
| the Youtube channel 'The Signal Path' [1]. It has some fantastic
| technical teardowns and repairs of instruments, including really
| high frequency equipment.
|
| [1] https://www.youtube.com/channel/UCKxRARSpahF1Mt-2vbPug-g
| hobs wrote:
| You probably already watch him, but Marco is also great when it
| comes to similar content (he loves his multimeters)
| https://www.youtube.com/@reps
| doormatt wrote:
| Gloves and PPMs!
| n_plus_1_acc wrote:
| I like bigclive. He takes apart cheap electronics from eBay.
| nativeit wrote:
| Curious Marc[1] works on a lot of old HP test equipment, and
| he's also a Silicon Valley native, frequent contributor to the
| Computer History Museum, and his channel features an HN
| regular, Ken Shirriff, who can reverse engineer everything from
| vintage Russian Soyuz components to uncapped IC packages.
|
| 1. https://youtube.com/@curiousmarc?si=pHOewmmWbDDmSSZb
| bloomingeek wrote:
| It's so good and satisfying to see a person ply a trade to
| success. When I find myself stressed out for some reason, I like
| to do something I'm well trained at to help my brain kind of
| reset, which often gives me a different way of looking at what
| stressed me in the first place.
| hristov wrote:
| This is very interesting. I just have one minor nitpick. Broadcom
| did not buy Avago, Avago bought Broadcom. They then changed their
| name to broadcom as it was more recognizable in the industry
| (while keeping their old stock ticker AVGO as that was more
| recognizable in the financial industry).
|
| This is entirely a tangent but the rise of Avago from a minor
| second rate spin off from a spinoff from HP to one of the biggest
| and most profitable companies of the world (and one that is many
| times the size of current HP), is one of the most unusual mostly
| untold stories of the modern business world. It is a story of
| success (by Avago and Broadcom engineers and management) and
| incredible incompetence (by hp management that let them go for a
| pittance).
| jjoonathan wrote:
| Oh wow, I was just transplanting some TC702 amplifiers to save
| the doubler in an old 50GHz HP signal generator... would that
| have been designed by these guys back when they were part of
| HP?
|
| https://www.keysight.com/us/en/assets/7018-04165/application...
|
| EDIT: that's registration-walled, but this HP Journal article
| isn't. https://archive.org/details/Hewlett-
| Packard_Journal_Vol._42_... The amplifiers in question are
| blue-colored in the background, and the doubler that uses them
| is the spiritual successor to the rear-most golden module.
|
| EDIT2: yep, the timeline lines up. The HP journals with these
| amplifiers were early 90s, and "This division became part of
| Agilent Technologies when HP spun off its test and measurement
| business in 1999. Later, in 2005, Agilent spun off its
| semiconductor products group, which became Avago Technologies.
| "
| cardiffspaceman wrote:
| // "You will need an oscilloscope, passive probes, ..."
|
| That's my stop.
|
| This engineer is determined! Built a test circuit to identify one
| part.
| prbs23 wrote:
| This is an awesome write up!
|
| I have one of these scopes, with exactly this issue after a long
| period in storage. When I was looking into it a few years ago the
| failure mode was known but I couldn't find a recovery procedure.
| I'll need to give this a try when I get a few hours. I have been
| putting off getting a new scope in hopes that I could repair this
| issue.
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