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Chapter 3 Preparation and inspection before observation
3 Check that there is no dirt or water on the objective lens and the
electrodes of the insertion tube distal end. If dust or water is
present, wipe them clean with a soft piece of gauze, a cotton swab,
or a sweep them off with a brush, grasping at hard part of distal
end. The best results may be obtained using the lens cleaning fluid
provided in the lens cleaning kit.
CAUTION
• Using the objective lens or the electrodes of the insertion tube distal end while dirt or water is
present may cause damage to the optical adapter or the insertion tube distal end.
4 Use the brush provided in the cleaning kit to wipe off any dirt found
in the positioning groove, the positioning cut surface or screws on
the insertion tube’s distal end. Note that insufficient cleaning can
result in a loss of waterproofing between the optical adapter and
the insertion tube’s distal end.
5 Check that the distal end of the insertion tube is not deformed,
loose or 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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