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Chapter 3 Preparation and inspection before observation
3 Check that there is no dirt or water on the objective lens of the
insertion tube's distal end. If dust or water is present, wipe them
clean with a soft piece of gauze, a cotton swab, or sweep them off
with a brush, grasping the hard part of the distal end. The best
results may be obtained using a commercially available absolute
ethanol or isopropyl alcohol.
CAUTION
• Using the objective lens of the insertion tube's distal end while dirt or water is present may
cause damage to the optical adapter or the insertion tube's distal end.
4 Check that the distal end of the insertion tube is not deformed,
loose, or that there is not unusual wear on the connecting screw.
CAUTION
• Never use the distal end of the insertion tube if any part is loose. Otherwise, the loose part
may fall into the inspection object.
• The angulation section is composed of precision parts. Do not pull the distal end of the
insertion tube, do not grasp/bend with a strong force. Otherwise, the parts in the angulation
section may be damaged.
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