Shimadzu IonFocus Instruction Manual page 86

5 Maintenance
9
Attach the corona needle to the DUIS focus unit ASSY.
10
Mount the DUIS focus unit ASSY.
11
Mount the ground plate.
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IonFocus Unit
Attach it in such a way that the tip of the corona needle enters the notch of
the focus electrode 1.
"3.2.1 Mounting the DUIS Focus Unit ASSY" P.24
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