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2.1 Control Knobs and Switches on Main Unit
2 - 2
2.1 Control Knobs and Switches on Main Unit
2.1.1 Main Unit
Figure 2.1-1 shows the appearance of the S-3400N main unit (Type II).
Fig. 2.1-1 External View of the Column (Type II)
NOTICE: Do not touch the Condenser Lens Adjustment Screws (8 places).
The position of the condenser lenses adjusted shift, and the first performance might
not be obtained.
Electron Gun
Column
Objective Lens Movable Aperture
S
p
ecimen Chambe
r
Specimen Stage
(Photo: Type II stage)
A
IR
S
wi
tc
h
EVA
C
S
wi
tc
h
Key Switch
(Power switch)
EVAC Panel
TrackBall
Type
II stage accessory
Condenser Lens Adjustment Screws (8 places)