Dear All,

I am far from being a GC MS specialist and I would appreciate some help.

We have an ITQ 700 ThermoFisher GC MS.

Since few weeks I can't see heavier m/z.

The source was completely cleaned and the problem is still the same.

In Tune: Diagnostic shows that everything is fine.
The Automatic Tune EI fails for Res. ejection amp and Injection RF since it cannot find the 613 ions.

If I do a lens tune on 414 I'm losing all the ions ! I can't see anything... I have to reload the tune file with the previous data.

If any specialist has an idea or if anyone would like to run a Teamviewer - I would be very glad.

Cheers,

KL