7 General Maintenance
To Clean an EI XTR, SS, or Inert Source
5977B Series MSD Operating Manual 205
3 Collect the following parts to be cleaned for an EI XTR source: (See Figure 66
on page 206.)
• Repeller
• Repeller block insert
• Source body
• Extractor lens
• Ion focus lens
• Entrance lens
These are the parts that contact the sample or ion beam. The other parts
normally should not require cleaning.
If insulators are dirty, clean them with a cotton swab dampened with
reagent-grade methanol. If that does not clean the insulators, replace them. Do
not abrasively or ultrasonically clean the insulators.
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