Hitachi TM3030 Plus Instruction Manual page 264

NOTE : Since the liner pipe is thin and easily bent, when pulling it out, pull it straight up.
6. Remove the objective aperture unit and replace the objective aperture.
Grasp the center of the liner pipe, and using a slotted screwdriver, turn the stopper at the
tip counterclockwise to take out the objective aperture unit. Clean the tip of the slotted
screwdriver in advance with alcohol. In the next step, disassemble the objective aperture
unit, and install a new objective aperture. Because it is thin and easily deformed, use
adequate care for installation. Also, since the open hole on the objective aperture is
extremely small, scratches and the adhesion of particles can reduce image quality.
When handling the objective aperture unit, exercise adequate care not to let dust and
particles on it.
Figure 5.4-5 Removing the
Objective Aperture Unit
7. Install the objective aperture unit into the liner pipe.
When finishing replacement of the objective aperture, use a slotted screwdriver to attach
the objective aperture unit to the tip of the liner pipe by performing the reverse procedure
of Step 6. above. Finally, apply a small amount of the supplied vacuum grease onto the
o-ring on the liner pipe.
Figure 5.4-4 Pulling the Liner Pipe Out (2)
Stopper
Figure 5.4-6 Disassembling the Objective
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Liner pipe
Spacer
Objective aperture
Aperture holder
Aperture Unit