General Maintenance 4
Troubleshooting and Maintenance Manual 73
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 RIS upper cover.
11 In the Instrument Control panel, select the MS Tune icon to display the 
GC-Q-TOF 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 selecting the check box.
13 Purge the calibration valve by selecting 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.