High Noise on GC 7890B

Dear Community

We faced problems with our GC 7890B which is connected to a Leco Pegasus BT. Since this week we have a really high noise, which comes regularly every 5seconds. We already cleaned FID many times, replaced Jet and built the FID out an in.

This is how it should look (orange line):

This is how it looks now:

When zoomed in, the noise looks like this:

Do you have any ideas from where this could come from? we are thinking about an electronic issue (?)

Thanks a lot in advance for your ideas!

KR GCarmen

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