Hitachi TM3000 Instruction Manual page 237

NOTE : When handling the components inside the electron gun (the cap, the Wehnelt, the
anode and the cartridge filament), use clean gloves to keep them free of particles
and smudges.
CAUTION : The electron gun weighs 2.5 kg. When opening the electron gun, do not
release your hand until the electron gun comes to a halt. Releasing your
hand mid-way can potentially cause pinched fingers or injury.
5. Pull out the liner tube straight up.
Liner Tube
6. Remove the liner tube; replace the condenser lens aperture.
7. Grasping the top holder, remove the pipe by turning it counterclockwise. A condenser
lens aperture and a holder are built between the pipe and the top holder, and between the
pipe holder and the pipe. Replace them with new condenser lens aperture. As the condenser
lens aperture and the holder are small parts, when removing them use caution so that they
are not accidentally dropped.
Figure 5.3-3 Removing the Liner Tube
Figure 5.3-4 External View of the Liner Tube
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