Shimadzu IonFocus Instruction Manual page 36

3 Preparation
2
Mount the focus unit ASSY.
3
Mount the ground plate.
14
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IonFocus Unit
Align the pin of the focus unit ASSY with the notch, and insert the ASSY as far
as it will go.
Visually check that the tip of the capillary is aligned with the center of the
electrodes of the focus unit ASSY.
"3.1.1 Mounting the Ground Plate" P.9