TDS7054 TDS7104 Signal Path Compensation Fix

[jkohout]

I have two TDS7000 series scopes that fail Signal Path Compensation.   Everything else works fine, but it cannot pass cal because of the the failure.

I have read all the info about the NVRAM, but it does not look like the issue.  It power up and gets the correct serial number and option codes.

I also looked at the data acquisition board, and nothing looks bad or damaged.

Anyone have any tips on how to fix besides a whole new data acquisition board?

Would a bad NVRAM battery possibly cause the SPC failure? 

Both work working good and passed cal last year.  Only been sitting in the lab and being used, so no physical or storage damage is suspected.

Thanks in advance.

[plazma]

Did you get it fixed?

I have a TDS7104 which usually fails SPC. But after many repeats it passes.
Is it possible to see which channel fails? Maybe components could be swapped between channels to see what is faulty.

[jkohout]

No, not really.  I reset the NVRAM, and it seemed to help.  Sometimes it passes SPC and sometimes it fails.  If you run it two three times, it eventually passes.  Would be good to figure out, but maybe time to upgrade.

[Johnny10]

I had this problem on a Tek 784D Scope... after changing the acquisition board the error went away.

Reading on this topic I found a Tek Forum customer that found problem in input channel attenuator hybrid.