Date: Tue, 27 Jan 2026 10:52:01 +0100
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
>
>
>
> Dr. Philipp Hegemann
> Department fuer Chemie
> der Universitaet zu Koeln
> NMR-Abteilung
> Greinstr.4 <x-apple-data-detectors://3>
> D-50939 Koeln <x-apple-data-detectors://3> (Germany)
> (+49) (0)221 470 3874 <tel:(+49)%20221%20470%203874> (office – OC 117)
>
> http://www.nmr.chemie.uni-koeln.de/nmr.html
>
>
>> 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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(image/jpeg attachment: AQS3_back.jpeg)