Topcon TRC-NW400 - Cleaning the Objective Lens

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MAINTENANCE
When the monitor screen is stained by fingerprints or the like
Wipe the screen lightly with the dry monitor cleaner, which is an accessory.
If the fingerprints are not removed well, moisten the monitor cleaner with a little water and then wipe
the screen with it.
Cleaning the objective lens
x To check if the objective lens is stained, darken the room and illuminate the objective lens with a
flashlight, etc. Examine the objective lens diagonally from the front. The lens condition can be seen
clearly.
How to wipe the dustproof coated objective lens
The wiping method is different from the conventional coated lens.
The resistance against wiping is very low and the lens is smooth.
x Dust and dirt adhered to the surface
Blow them off using a blower.
Be careful to prevent the blower end from touching the objective lens.
x When the stain is simple such as dust, tears or saliva:
1 Breathe toward the objective lens and wipe it carefully with a piece of lens cleaning paper.
2 If your lens cleaning paper is dirty, replace it with a clean one and repeat step 1.
3 Repeat steps 1 and 2 until no stain is seen on the lens.
x When the stain is persistent:
1 Moisten a lens cleaning paper with reagent ethanol properly. Wipe the objective lens with the
lens cleaning paper by rubbing lightly.
2 If your lens cleaning paper is dirty, replace it with a clean one and repeat step 1.
3 Repeat steps 1 and 2 until no stain is seen on the lens.
4 Finally, wipe the objective lens with a dry piece of lens cleaning paper (which is not moistened
with solvent) until it is clean. It is O.K. to wipe the lens after breathing toward it.
NOTES
•Don't use the following methods because the lens may be damaged.
•Wiping the lens by grasping with fingernails
•Using a lens cleaning paper wound around a hard tool (for example, a
metallic tool).
•Use a soft lens cleaning paper without fiber.
•For example, BEMCOT (Asahikasei)
•Don't let any strong-alkaline liquid adhere to the objective lens.
If such a liquid adheres to the lens, immediately wipe it off.
•If it is difficult to remove a stain from the objective lens, contact your dealer or
TOPCON (see the back cover).