Products > Test Equipment
TDS3012B ethernet configure failure
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Galen:
For the connecter scoket, I just try to plug the cable a few times to clean it if any dust/rusty. Not physically check it.  normally, it is very rare this thing has problems.
I checked the flexible connection between PSU and the main board, it's good.
YetAnotherTechie:

--- Quote from: Galen on June 23, 2020, 07:43:02 am ---For the NVRAM, yes, I replaced the battery, as the original battery dead.  I found the scope power on hour is a very big number.  So I think can be considered as 'changed the NVRAM'. Is this related to the network connection?

--- End quote ---

In my experience with a 3034b, network will fail if nvram is corrupted.
Mine was working, i removed the nvram to make a backup and replace the battery, and it became corrupted. After that no more network connection!
The mac address shown in the configuration page had changed.
i was able to find a dump somewhere here on the eevblog. There i could see the mac address, i found an entry on my router with the old mac of the scope, put it back in ram, and then it started working. I made tests, and having an invalid mac adress set in ram resulted in no connection, even if the scope with a corrupted mac in nvram, shows a valid mac in the configuration page!
james_s:
There's a button you hold down and power up, I think it's B-trig? That will reset the entire NVRAM to factory defaults, if you suspect it's corrupted that's the first thing I'd try.
Galen:
Hi YetAnotherTechie,  I guess your input will work.  Because the network working TDS3012B, I didn't do anything to it except changed the crystal oscillator. The other 2 TDS3000B, I de-soldered the NVRAM and replaced the battery. I found one of them the working hours is a very big nunber, So I think the content of it could be 'corrupted'.
So I will try to read out the MAC address from the good one, and write it into the bad one NVRAM using TL866, to test if it works. or I will find a TDS3012B NVRAM image file, in this blog, and write it into the NVRAM.  will report back later. thanks a lot for the experience sharing.
Galen:

--- Quote from: james_s on June 24, 2020, 01:50:58 am ---There's a button you hold down and power up, I think it's B-trig? That will reset the entire NVRAM to factory defaults, if you suspect it's corrupted that's the first thing I'd try.

--- End quote ---
Hi james, thank you very much for the suggestion. If it's Trigger B, i have tried it before when I try the network connection using DHCP and the scope dead there., have to power off and power on by pushing and holding the trigger B.  Otherwise, the scope will be dead after the splash screen. but tried network connection after this, still no joy. Will report any progress.
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