Specifications

80 5975 Series MSD Troubleshooting and Maintenance Manual
3 CI Troubleshooting
Cannot complete Autotune
Wrong or corrupted tune file
Check the tune parameters.
The m/z 28/27 ion ratio (for methane) is incorrect. The correct ratio should be
between 1.5 and 5.0.
If the ion ratio is incorrect, adjust it. See the Operation Manual.
The CI ion source is dirty.
Clean the ion source. See “To Clean the CI Ion Source” on page 164 for more
information.
Too much air or water in the system
See “Air Leaks” on page 60. After eliminating these problems, clean the ion
source.