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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