Hi,
did you also check the LEDs deeper? From the BSMS? They are almost on the g=
round (also on the back side).
Philipp
Von: main_at_ammrl.groups.io <main_at_ammrl.groups.io> Im Auftrag von Igor Moudra=
kovski
Gesendet: Dienstag, 27. Januar 2026 10:52
An: main_at_ammrl.groups.io
Betreff: Re: [AMMRL] Bruker Avance III : No communication between the SGUs =
and Amplifiers
Hi,
I am not sure which fuse would be in question? Here is a photo of the AQS/3=
back. The fuses in the upper right corner are good.
Regards,
Igor
On 26/01/2026 17:39, Philipp Hegemann via groups.io wrote:
Hallo,
Is it possible that a fuse is broken? Check on the back side if there is a
LED not on. They are easily overseen…
Greetings
Philipp
Am 26.01.2026 um 17:09 schrieb Igor Moudrakovski:
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 - 07:19:56 MST