Hi,
Yes, we have tried to swap the Ethernet switch without any positive outcome.
Regards,
Igor
On 26/01/2026 19:13, Spin-Doc wrote:
> Hi,
>
> Have you already tried to swap out the console ethernet switch?
>
> Cheers
> Bert
>
> -> Sent via mobile <-
>
> Spin-Doc
> Magnetic resonance equipment, service, training & more
> Dr. rer. nat. Bert Heise
> Owner, applications scientist
> Kiefernweg 13
> 58239 Schwerte
> Germany
> Web: http://www.spin-doc.net
> Mail: bert.heise_at_spin-doc.net
> Phone: +49-171-5135315
>
> Representing MestreLab software, Stelar relaxometers & Barthel HF
> amplifiers
>
>
>
>> Am 26.01.2026 um 11:39 schrieb Michael Groves via groups.io:
>>
>> Hi Igor,
>>
>> Most frequently when we see this error it's just because something
>> didn't get powered on in the right order so the amplifier just needs
>> to get a new IP address assigned so that they can communicate again.
>> Normally you can resolve this by simply power cycling the amplifiers,
>> waiting for them to boot up, and running cf again. This might not be
>> the cause of your errors. There are a couple of other things that
>> you can check.
>>
>> When you open up ha and see the amplifiers listed, can you open the
>> service webpage? And do these amplifiers have input routers or do
>> they just have one input? You might check the ethernet switch in the
>> console just to see if you've got a couple of bad ports or some other
>> communication failure. You might try a different input to the
>> amplifier--we have seen cases where one or more of the router inputs
>> fails so when the SGU pulses during that part of cf, no pulse gets to
>> the amplifier and you get the "no connection detected" message. I
>> assume there's not a router in the AQS rack that routes the SGU
>> signals to different amplifiers. If there was one of these I might
>> try bypassing that as well. How do the cables look between the SGUs
>> and amplifiers? Normally those don't fail but it might be worth
>> disconnecting them at both ends and seeing if they're in good shape,
>> and installed correctly. (note--I would expect that to be the case
>> but it doesn't hurt to be thorough.) Since you don't have a valid
>> configuration you can't pulse on the amplifiers but if you were to
>> use nmr_restore you might be able to get back a valid configuration
>> and just try pulsing on the amps and see what inputs and outputs are
>> present. If you've got an oscilloscope you can have a look at the
>> input and output pulses as well as the blanking signal.
>>
>> Good luck,
>> Mike
>>
>>
>>
>> On Monday, January 26, 2026 at 09:08:52 AM MST, Igor Moudrakovski wrote:
>>
>>
>> Hello Everyone,
>>
>> I have a Bruker Avance III 400 MHz solid-state system circa 2010
>> (Cento5.11, Topspin 3.6.2), which developed over time a communication
>> problem between the SGUs and the amplifiers. The CF proceeds seemingly
>> without any problem, only to end up with an error message
>> ‘No connection between SGUs and amplifiers found! Acquisition will not
>> be possible. The wiring may be incorrect, or the emergency stop
>> signal may be active. Please check the hardware and do ‘cf’ again.’
>>
>> No visible problems with the hardware; all LEDs in front and back are
>> green, no warning/flashing lights, and no connections have changed since
>> the instrument was functioning. The ‘ha’ reveals no obvious problems
>> either.
>>
>> Last year, Bruker responded to the problem by replacing all the fans and
>> filters in AQS/3, as well as the amplifiers. That resulted in about two
>> months of stable work, but apparently didn’t solve the root problem. Now
>> the instrument is back to the state of ‘No connection between SGUs and
>> amplifiers…’ Numerous reboots didn’t move the problem.
>>
>> I would be very grateful to hear all your suggestions for resolving the issue.
>> Thank you and best regards,
>>
>> Igor
>> --
>> Igor Moudrakovski, PhD
>> Max-Planck Institute for Solid State Research
>> Heisenbergstr. 1, 70569 Stuttgart, Germany
>> Office 711-689-1963
>> 400 NMR 711-689-1410
>> 600 NMR 711-689-1054
>>
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Received on Tue Jan 27 2026 - 03:35:27 MST