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Prior to cleaning any lens surface, brush dust or dirt off lens surfaces using a camel hair brush. Or use air to blow dust
and lint off surfaces. Use of compressed air in a can, available at any computer supply store, is a good source of
clean air.
Do not remove eyepieces or objective lenses to clean. Clean only the outer lens surface. Breath on lens to dampen
surface, then wipe with lens paper or tissue or use a cotton swab moistened with distilled water. Wipe lenses with a
circular motion, applying as little pressure as possible. Avoid wiping dry lens surface as lenses are scratched easily. If
excessive dirt or grease gets on lens surfaces, a small amount of Windex can be used on a cotton swab or lens
tissue. To clean objective lenses, do not remove objectives from microscope. Clean front lens element only, following
same procedure.
NOTE: Fingerprints or other matter on the front lens element of the objective lens is the single most common reason
that you will have difficulty in focusing the microscope. Before having costly servicing done, or before returning to
National for "warranty repair", make certain to examine the front lens element with a magnifying glass or eye loupe for
the presence of such contaminants. If a microscope is returned to National for warranty repair, and it is determined
that such contaminants are the problem, this is not covered under warranty and National will submit a cost estimate for
cleaning.
2. MECHANICAL MAINTENANCE
a. The rack stop screw has been pre-adjusted at the factory and should not require re-adjustment. However, if you
do attempt re-adjustment, note the following procedure.
Using a 2mm "L" type hex key wrench, loosen rack stop hex socket set screw by rotating in a counterclockwise
direction. With fine focus adjustment at mid-range, focus on a standard slide until sharp image is obtained.
Rotate rack stop screw in clockwise direction until tight
b. Coarse focus tension adjustment prevents the stage from drifting down from its own weight and causing the image
to move out of focus. This has been adjusted at the factory, but over the course of time it may loosen and cause
the stage of the microscope to slip downward on the focusing block.
With stage facing you, the tension adjustment collar is located between arm and coarse focus knob on left side of
microscope. Turn collar counter-clockwise to tighten tension, clockwise to loosen tension.
NOTE: It is recommended that you leave the tension as loose as possible for ease of focusing, yet not so loose
that it permits the stage of microscope to drift downward from its own weight and cause the microscope to "drift"
out of focus.
c. Metal parts: Use a clean, damp cloth to remove dust or dirt from metal parts, followed by a dry cloth.
3. ELECTRICAL MAINTENANCE
The extent of electrical maintenance, by other than a qualified technician, should be LED replacement, battery
recharging and battery replacement. Before maintenance, be sure that recharger is not connected to microscope.
a. Recharging batteries:
Plug output cord from battery charger into DC recharging socket located on back of microscope base. Your
automatic switching recharger operates on 100 to 240 volts AC 50/60 Hz, plug recharger into your AC wall outlet.
The red LED indicator lamp located on recharger will be illuminated when batteries are receiving maximum
charge. After batteries are charged, the red LED indicator lamp will turn to green and charger automatically
switches to "trickle charge". The charger can be left plugged in, but for safety reasons it is a good idea to
disconnect the charger from the AC wall outlet and the output cord from recharging socket after 12 hours.
Batteries and charger may feel warm when charging, and unplugging the recharger is a safety precaution.
You may operate the microscope light even while it is being recharged. Simply flip light switch to "on" position and
continue using microscope while the recharger is fully engaged.
b. Replacing batteries:
6
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