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Tektronix DPO70804 Oscilloscope and Acquisition Error Code 321

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bracecomputerlab:
First time poster here on eevblog.com forum.
I recently purchased Tektronix DPO70804 8 GHz bandwidth oscilloscope.
Unfortunately, the seller did not disclose that the unit suffered from acquisition error code 321 (PaDma) when I run the oscilloscope's diagnostics test.
I specifically asked about this specific potential issue prior to the purchase since another seller of a similar model (a broken Tektronix DSA72004B that the seller disclosed the acquisition error code 321 issue and selling it as-is / no return for about $12K) had such an issue.
It appears that this is a fairly common failure mode of Tektronix DPO70000 / DSA70000 family.
The seller did not really respond to the question, and commented on its cosmetic condition, etc.
Unfortunately, I did not know any better, and discovered the issue when I ran the diagnostics myself.
I spoke with an oscilloscope repair shop nearby that has experience fixing Tektronix DPO70000 / DSA70000 family, and they told me that I will likely pay something like several times of the not so significant purchase I paid for.
This person I spoke with suggested that this is a known issue, and I should return to the seller due to its high repair cost.
Someone on this forum talked about reviving his / her Tektronix DPO70604 a year ago suggested a heat related BGA package issue might be the reason why a Tektronix DPO70000 / DSA70000 fails over time.
At this point, I plan to return the unit for a full refund (maybe minus the shipping cost), but how much does it cost to resolder affected BGA packages on that huge analog acquisition board that contains exotic IBM SiGe amplifiers?
I appreciate any advice or suggestions.

coromonadalix:
return it  period

reballing bga   if not equipped ...  you will need  to heat the board,  kapton tape to protect surrounding parts,   have hot air equipment(s),   bga stencils,  solder paste for reballing   etc .... anti static garnments

bracecomputerlab:

--- Quote from: coromonadalix on November 17, 2024, 02:02:47 am ---return it  period

reballing bga   if not equipped ...  you will need  to heat the board,  kapton tape to protect surrounding parts,   have hot air equipment(s),   bga stencils,  solder paste for reballing   etc .... anti static garnments

--- End quote ---

You are the third person so far that thinks I should return the item, and it is really 3 / 3.
Thank you for the advice.

calibrationfixture:
Hi bracecomputerlab,

Found this on the internet, maybe your Unit:

" Tektronix DPO 70804 Digital Phosphor Oscilloscope, 8GHz, 25GS/s , 100-240V, 50/60Hz, w/ opt STU JA3; 4ea TCA-292MM adapters. Serial no. B020586. (fails SPC and diag 321, scope fails BWE at 8GHz all channels) "

I don't know the amounts involved. Even without a good Acquisition Board, when such a Scope Powers Up etc. it has some considerable value.

The Acquisition Boards of these Scopes are very thick, making a succesfull Rework difficult and if successfull for how long it will sustain. A perfect fit with the Board is Key in getting rid of the heat on the Die. Heatsinked or not. Read recently some AMD Comments on CPLD Reworks.

Calibrationfixture 

bracecomputerlab:

--- Quote from: calibrationfixture on November 17, 2024, 08:01:43 am ---Hi bracecomputerlab,

Found this on the internet, maybe your Unit:

" Tektronix DPO 70804 Digital Phosphor Oscilloscope, 8GHz, 25GS/s , 100-240V, 50/60Hz, w/ opt STU JA3; 4ea TCA-292MM adapters. Serial no. B020586. (fails SPC and diag 321, scope fails BWE at 8GHz all channels) "

I don't know the amounts involved. Even without a good Acquisition Board, when such a Scope Powers Up etc. it has some considerable value.

The Acquisition Boards of these Scopes are very thick, making a succesfull Rework difficult and if successfull for how long it will sustain. A perfect fit with the Board is Key in getting rid of the heat on the Die. Heatsinked or not. Read recently some AMD Comments on CPLD Reworks.

Calibrationfixture

--- End quote ---

Hi Calibrationfixture,

No, the S/N of the unit I have is, B031XXX.
Because I still have not contacted the seller, so I do not think I should disclose the full S/N.
Speaking of the S/N, by any chance, can Tektronix ever sell more than a few thousand of DPO / DSA70000 in its lifetime?
Because each unit costs over $100K in Year 2007 / 2008 dollars, I will assume that there are only a low thousands of DPO / DSA70000 in circulation around the world.
    When I purchased it, I was not fully aware of the need for a 5-15P to IEC C15 power cord to power the oscilloscope.
The seller did note the IEC C15's "notch" thing, but I did not hear about the IEC C15 plug specifically.
The unit is rated for 1,100 VA (basically a midrange microwave oven), and I did not have a power IEC C15 type handy, so I had to go buy one on eBay.
I purchased a what seems like a new old stock (unused, but was produced 15+ years ago type of an item) Tripp Lite right angle C15 to 5-15P, 125 V 15 A, 8 ft (Model: P019-008-C15RA), but purchasing it slowed me down by 5 or so days.
The power cable is 14 AWG, and I will never want to use anything less than that with DPO70804.
Almost all PC desktop power supplies connect to an IEC C13 power cord, but C15 power cord has part of the bottom portion removed.
This is apparently how Tektronix prevents 18 AWG IEC C13 from hooking up to the unit, and risk causing a fire incident.
I still have more than a week to arrange a return and I plan to contact the seller tomorrow (Monday).

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