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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack

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Jwalling:

--- Quote from: Gandalf_Sr on February 23, 2018, 03:15:55 pm ---I just put a low offer in for an Agilent 54835A on eBay "parts or not working" status - screen shows nothing.  Maybe they'll accept, maybe not.  What should I be looking for?  Is the Agilent 54845A a whole lot better?

--- End quote ---

There's a pretty good chance that the failure on that one, is bulging caps on the FIC motherboard, BTW. But I wouln't pay more than $600 to $700 if I were interested.

Gandalf_Sr:
Thanks guys, what about the 500 MHz version, the 54815A?  Can the resistors be changed on the acquisition PCB to increase the bandwidth?

And what about this one as a risky purchase? https://www.ebay.com/itm/Agilent-54855A-54855-66413-DSO-Infinium-Oscilloscope-parts-or-repair-only/152916007613?hash=item239a811abd:g:~sUAAOSwATxajG-e

It's a 54855A chassis with no PC motherboard, drive, FDD, or cover.  If the acquisition PCB is good, it's 6 GHz with 20 Gsps on all 4 channels simultaneously!  If this were made good, it's asking price is $9,000 or more.

Can you guys tell from the photos whether the serious parts are there? What do you think would be involved to get it going?

[EDIT] the same seller has a 54855A power supply for sale, he wants $3,480 for it!  He doesn't realize that it's only worth $20!
https://www.ebay.com/itm/Agilent-HP-54855A-5110-PACC00-111-0950-4369-Power-Supply/152911922763?hash=item239a42c64b:g:KvEAAOSwn9VaiHG3

nctnico:

--- Quote from: Gandalf_Sr on February 24, 2018, 03:27:51 am ---And what about this one as a risky purchase? https://www.ebay.com/itm/Agilent-54855A-54855-66413-DSO-Infinium-Oscilloscope-parts-or-repair-only/152916007613?hash=item239a811abd:g:~sUAAOSwATxajG-e

--- End quote ---
Don't touch that. At least the acquisition interface board is missing. And you might need specific videocards as well.

Tony_G:

--- Quote from: nctnico on February 24, 2018, 08:47:27 am ---
--- Quote from: Gandalf_Sr on February 24, 2018, 03:27:51 am ---And what about this one as a risky purchase? https://www.ebay.com/itm/Agilent-54855A-54855-66413-DSO-Infinium-Oscilloscope-parts-or-repair-only/152916007613?hash=item239a811abd:g:~sUAAOSwATxajG-e

--- End quote ---
Don't touch that. At least the acquisition interface board is missing. And you might need specific videocards as well.

--- End quote ---

Holy crap! It's missing everything including the A/D hybrids - this is worth maybe $200-300 if that - run, don't walk, run from that $1500 price. I think they even stripped some other ICs off the board. $200 might have been too generous....

TonyG

Jwalling:

--- Quote from: Tony_G on February 24, 2018, 09:13:26 am ---
Holy crap! It's missing everything including the A/D hybrids - this is worth maybe $200-300 if that - run, don't walk, run from that $1500 price. I think they even stripped some other ICs off the board. $200 might have been too generous....

TonyG

--- End quote ---

I think the hybrids are there, but they're missing the heat sinks. But, you got to figure that they stole other parts because the ACQ board had problems...

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