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4.1.1
4 - 5
(9) Check to see that the Wehnelt is securely fitted. After that, use a spray or blower to
completely remove any lint and other debris attached to the filament assembly.
Fig. 4.1-10 Cartridge Filament Assembly
(10) Attach the filament assembly to the electron gun. Fix it by turning the holding ring
clockwise.
Fig. 4.1-11 Installing the Cartridge Filament Assembly
(11) Set the gun onto the column.
Fig. 4.1-12 Installing the Electron Gun Unit
NOTICE: Unload the electron gun after O-ring returns to the groove when it has come off from
the groove.
CAUTION: When setting the gun, take care not to pinch the O-ring. The gun should be
lowered by both hands until it stops. If the gun is released halfway, your
fingers might be caught in it.