Electronics > Repair
Series defect on agilent 167xx boards?
MarkL:
Awesome sleuthing!
I can confirm it's 1GHz.
And you found a signal that does NOT appear on the bottom. So now I have to say "almost all signals appear on the bottom". I can understand why they didn't want any extra vias on that pair!
DogP:
Success! While I probably have other things I should be doing tonight, I don't have anything I'd rather be doing. ;) I swapped the SY89421V from my 16716A, booted it up, and it passes all self-tests, and the Timing Zoom signals show up correctly with the regular waveform. :)
As expected, it looks like the SY89421V is way obsolete. Any chance you have a "parts" board you'd be willing to sell one off of? Or, know where I could find one? Digikey/Mouser don't have them anymore, and I didn't see any for sale on ebay or aliexpress. I could probably hack together a replacement, but probably not worth the cost/effort of building a small carrier to do that.
Thanks for digging into those clock signals on the Zoom chips... I guess luckily for me I didn't need to trace them, but hopefully it'll help someone in the future. And overall, thanks for sticking with me while I worked my way through these boards! I'm really excited to start getting to use the machine. Though I'm also excited to mess around with the pattern generator a bit, as well as writing some code for the TDK.
Thanks,
DogP
DogP:
--- Quote from: MarkL on February 20, 2022, 04:16:58 am ---I can confirm it's 1GHz.
--- End quote ---
Haha... gotta rub it in with a screenshot from your awesome scope! ;)
DogP
MarkL:
Excellent!
It was fun following along and it gave me an excuse to do more tracing and post it. Thanks for sharing the details of what you were doing.
I took a quick look, and from I can tell they used the SY89421VZC on all the zoom-capable 167xx boards, including the higher end 16753A/54A/55A/56A. I have a bunch of dead boards and I can send you a PLL, no problem. Send me a PM and we can work out the details. Maybe you can email me a pre-paid USPS label and I can drop the chip (properly protected) in a flat rate envelope, or something like that.
MarkL:
--- Quote from: DogP on February 20, 2022, 04:33:35 am ---
--- Quote from: MarkL on February 20, 2022, 04:16:58 am ---I can confirm it's 1GHz.
--- End quote ---
Haha... gotta rub it in with a screenshot from your awesome scope! ;)
DogP
--- End quote ---
Of course I do. But it's my limit. I've resorted to the spectrum analyzer approach a few times too. It makes a nice tunable voltmeter.
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