Agilent DSO8064A self test failed in vertical test group

[schenkmi72]

Dear friends,

yesterday I picked up a Agilent DSO8064 after a longer train ride. The seller says "self test passed" but sadly when I did the test it did not pass  .

The the failure of the self test
Test: Vertical Test Group -- FAILED

Did anyone of you have a hint what's going wrong or is their a more detailed error log somewhere on this unit ?

Many thanks and best regards
Michael

[Jwalling]

Look in c:\scope\selftest
The text log will be there. Open in Wordpad so it formats correctly.

[schenkmi72]

I've attached the self test results getting from c:\scope\selftest

ScopeTestGood.txt is the same scope from 2012 which has passed the self test
ScopeTestBad.txt is the actual run which fails.

[schenkmi72]

When I do a diff of the two files I don't see a big difference nor can I sport the test which cause to fail 
diff -Naur ScopeTestGood.txt ScopeTestBad.txt > ScopeTestDiff.txt

[schenkmi72]

Yesterday I have calibrate the scope but the self test still fails

[Jwalling]

Oddly enough, I've seen that exact failure before. It turned out that the flex cable between the ACQ board and the probe board was cocked a bit.

[dzseki]

Assuming a honest seller, it indeed could be a mere contact problem with either hybrid or connection.

[analogRF]

I've attached the self test results getting from c:\scope\selftest

ScopeTestGood.txt is the same scope from 2012 which has passed the self test
ScopeTestBad.txt is the actual run which fails.

does the scope show signals correctly on all or some of the channels ?
are there more detailed individual tests that can be run in that drop down menu?
I am not familiar with 8064/8164 but I have repaired several 54845/46 and I suppose these must be similar in a lot of ways. In those infiniums you can run more detailed tests than just "vertical group".

My suggestion would be (1) check all the connectors and coming out of the acquisition board
(2) post a picture of the acquisition board so we can get a better idea of how it is configured (3) if it is anything similar to 548xx series, careful cleaning of the ASICs will most probably fix it. That is well documented in eevblog and youtube. but I don't know how the acquisition board in 8064 is designed.

[schenkmi72]

Hi all,
thanks for the fruitfully inputs and hints. In the mean time I've managed to reset the admin account, update to the latest and greatest 5.71 software and with help of some other threads here I have now a lot of options too

[schenkmi72]

Dear friends,
now a little bit of DSO8064A acquisition board porn . I've a lot more picture which I can upload if someone is interesting in.
Cheers
Michael

[schenkmi72]

Hi,
even it looks not totally nice but with some hot glue it's quite easy to install a SATA SSD without taking apart half of the 8064A to replace the harddrive.
Cheers
Michael

[schenkmi72]

I've attached the self test results getting from c:\scope\selftest

ScopeTestGood.txt is the same scope from 2012 which has passed the self test
ScopeTestBad.txt is the actual run which fails.

does the scope show signals correctly on all or some of the channels ?
are there more detailed individual tests that can be run in that drop down menu?
I am not familiar with 8064/8164 but I have repaired several 54845/46 and I suppose these must be similar in a lot of ways. In those infiniums you can run more detailed tests than just "vertical group".

My suggestion would be (1) check all the connectors and coming out of the acquisition board
(2) post a picture of the acquisition board so we can get a better idea of how it is configured (3) if it is anything similar to 548xx series, careful cleaning of the ASICs will most probably fix it. That is well documented in eevblog and youtube. but I don't know how the acquisition board in 8064 is designed.

Many thanks for the fruitful input. Beyond the up-hacking fun I've checked all cables from and to the acquisition board carefully. I found a not well seated flex and reseat it. In this kind of scope the ASIC's are soldered and can't be reseated. But after the reseat of the flex cable the scope pass it's vertical test group . So I'm very happy. Many thanks for all the good hints.
Cheers
Michael