90 Troubleshooting and Maintenance Manual
4 General Maintenance
9 Turn the collar clockwise to tighten it.
The collar should be snug but not overly tight. Do not use a tool to tighten
the collar. It does not require that much force.
10 Reinstall the analyzer window cover.
11 In Instrument Control panel, select the MS Tune icon to display the GC-QQQ
Tune dialog box. Select the Manual Tune tab then select the Ion Source tab to
display the ion source parameters.
12 Turn off the Emission by clicking in the check box.
13 Purge the calibration valve by clicking in the EI Cal Valve check box to open
the calibration valve. Close the EI Cal Valve after 30 seconds.
After removing a calibrant vial, you must purge the calibration valve. Failure to do so
will result in damage to the filaments and the electron multiplier.
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