Problems tuning after installing new electron multiplier on Agilent 5975C

My lab recently changed the filaments and installed a new electron multiplier on our Agilent 5975C. When I try to tune the peaks all seem like noise and then if gives me an error for the tune reading " Tune action Stopped: gain and offest=0 and peaks are too narrow!". An example of the noise I get during the auto tune is pictured in the attachment below. Any suggestions as to what the issue could be and how to fix it?

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