Tek TDS3000B network issue... - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: September 18, 2020, 07:56:47 pm
content: I've got 2 TDS3000B that can't connect to the network... the switch port's green led is on, but I can't get the scope to connect...Either timeout with DHCP, or simply no comm with a fixed IP. Same cable works perfectly on any PC (incl. very old one...).I tried several routers/switches, same story. All scope diags show 'PASS'.Someone already faced NIC issues on a TDS3000B ?I guess I'd need a cross-cable (don't have any since quite a while !!) to connect the scope directly to a PC, to check with Wireshark if something is happening at all on the line.(switch with span port isn't available either...)

author: gslick
author_rank: Frequent Contributor
timestamp: September 19, 2020, 02:12:08 am
content: Quote from: darkstar49 on September 18, 2020, 07:56:47 pmApparently if the NVRAM battery dies and the Ethernet MAC address is lost that can cause problemshttps://www.eevblog.com/forum/testgear/tds3012b-ethernet-configure-failure/msg3088528/

author: darkstar49
author_rank: Frequent Contributor
timestamp: September 20, 2020, 04:30:56 pm
content: Quote from: gslick on September 19, 2020, 02:12:08 amNVRAM battery isn't dead as it still keeps up with the actual data & time (more or less), but apparently, many people reported issues with a weak battery (whatever 'weak' means...) and playing around with the network settings...Finding some 'good' DS1742 seems to be the biggest challenge !!

author: giosif
author_rank: Frequent Contributor
timestamp: September 20, 2020, 07:56:55 pm
content: Read my latest post in the thread quoted earlier, as I suspect you are experiencing what I was observing with my NVRAM (+RTC) and it was actually low battery.For replacement, I suggest you dig out the old battery and solder a button cell battery holder in place.After that, you will also need a good NVRAM backup (you can find one somewhere here on the forum).As with the other thread, depending on where you live, you could ship the NVRAM to me and I can do the above for you.

author: darkstar49
author_rank: Frequent Contributor
timestamp: October 04, 2020, 08:50:47 pm
content: I just flashed the .bin image from another thread on eevblog, that apparently came from a working TDS3014B (can't remember exactly which thread/message), mine looked pretty weird before that, but afterwards, although flashing went OK, still no help, scope is frozen after splash screen (delay led is on ?), and time is totally erroneous (80h and something ...), and at the place of the date, there's just the text 'BUG'...would someone have another NVRAM image from a TDS3000B I could try ??

author: giosif
author_rank: Frequent Contributor
timestamp: October 04, 2020, 11:34:26 pm
content: But did you replace the battery on that NVRAM?In my case, before replacing the battery, I could flash the NVRAM and it would even verify ok with the programmer but, then, some time later, it would start losing parts of the content.

author: giosif
author_rank: Frequent Contributor
timestamp: October 04, 2020, 11:37:10 pm
content: Also, I suspect you soldered an IC socket on the main board, so you don't desolder/resolder the NVRAM IC every time you need to do something with it.Make sure the socket is properly soldered (i.e. no bridged pins, etc.) and that you are seating the NVRAM IC in the socket properly as well.

author: darkstar49
author_rank: Frequent Contributor
timestamp: October 05, 2020, 07:30:10 am
content: Quote from: giosif on October 04, 2020, 11:37:10 pmThe battery of that NVRAM is OK, it keeps time accurately. And I didn't solder in an IC support so far, as I had none with thin enough pins (ordered, but not there yet).I just think the image I found somewhere on eevblog a while ago, is not OK. That's why I asked if someone had another one, just to try.But as stated, while date & time are now garbage on the screen, the symptoms have not changed, immediately after the splash screen, and BEFORE the version info is displayed, it hangs completely (data & time frozen as well). I do not believe this is NVRAM related.And btw, there's some sort of a reset button on the network/battery board, I did not find any reference to it in the service manual (but didn't spend a lot on time on that), do you know what it's good for ?

author: Jwalling
author_rank: Unknown
timestamp: October 05, 2020, 09:07:33 am
content: Quote from: darkstar49 on October 05, 2020, 07:30:10 amThat button, if pressed while powering on, allows you to do a factory calibration. Be careful if you don't have the equipment to do this...

author: darkstar49
author_rank: Frequent Contributor
timestamp: October 05, 2020, 10:13:10 am
content: Quote from: Jwalling on October 05, 2020, 09:07:33 amYep... I'm indeed missing the 1ns pulse generator...

author: Jwalling
author_rank: Unknown
timestamp: October 05, 2020, 03:12:51 pm
content: Quote from: darkstar49 on October 05, 2020, 10:13:10 amYeah, and you need to drive both of the inputs on a 2 channel scope at the same time. I got stuck here before on a 3052B. The scope switches to 50 Ohms during this test. I'm wondering if you have to drive all four inputs at the same time @ 50 Ohms with a 4 channel scope...