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C. To clean eyepiece lenses, do not remove from eyepiece tube. 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.
2.
MECHANICAL MAINTENANCE
The only mechanical adjustment the microscope might require is the tension of the focusing mechanism. This has been adjusted
at the factory, but over the course of time it may loosen and cause the head of the microscope to slip downward on the focusing
block. The tension adjustment collar (chrome ring with 8 holes) is located between arm and focus knob on left and right sides of
microscope. With the supplied 0.90 "L" hex key wrench, locate and loosen the hex socket set screw located in one of the 8 holes
of the tension adjustment collar. . Your microscope was supplied with a pin spanner wrench having one prong. Insert pin of the
wrench into one of the holes located in adjustment collar, turn collar clockwise to tighten tension, counter-clockwise to loosen
tension. After adjusting tension tighten the small hex socket set screw to lock collar in place.
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
head of microscope to drift downward from its own weight and cause the microscope to "drift" out of focus.
3.
ELECTRICAL MAINTENANCE
To replace the extra long life LED transmitted (bottom) illuminator bulb.
A.
Using a 3mm "L" hex key wrench, remove the 6 hex head cap screws securing black plastic illuminator base to the
microscope pole -base.
B.
Carefully unplug the LED top light connector (attached to socket marked LED) from circuit board.
C. Carefully unplug the LED bottom light connector (attached to socket marked LED) from circuit board.
D. Using a 5.5mm hex nut driver remove two nuts from the 3mm screws securing light bracket to black base tray.
E.
Using a Phillips screw driver remove three each 3mm Phillips head screws securing light housing to lamp bracket.
F.
Using a Phillips screw driver remove two 3mm Phillips head screws securing LED bulb assembly to lamp bracket
G. Remove LED bulb and replace assembly with #800-425 LED bulb.
H. Replace lamp mounting screws (2 ea), light housing screws (3ea), lamp bracket mounting screws and nuts (2ea)
I.
Carefully plug the LED top light connector into socket marked LED on circuit board.
J.
Carefully plug the LED bottom light connector into socket marked LED on circuit board.
The extra long life LED incidental (top) illuminator bulb must be replaced at the factory. Remove the incidental top illuminator
assembly from the microscope focusing block by loosening the two black knurled knobs located on each side of illuminator and
unplug the power cord from the vertical post. Return the illuminator to National for replacement of the LED bulb.
TROUBLESHOOTING
PROBLEM
A light fails to operate.
Image does not remain in focus
Poor resolution
(image not sharp)
Spots in field of view.
***Spots in field of view can also result from dirt on inside of eyepiece. It is recommended that you have service
technician clean inside of lens.
.
REASON FOR PROBLEM
Items not properly connected
Switches not in proper position.
Transmitted LED bulb burned out.
Incidental LED bulb burned out.
Head of microscope drops from its
own weight.
Objective lenses dirty.
Eyepiece lens dirty.
Eyepiece lens dirty.
Check all electrical connections from
AC wall outlet to microscope input.
Check
controls.
Replace LED bulb
Send lamp assembly to National for
bulb replacement.
Adjust tension control.
Clean objective lenses.
Clean eyepiece lenses.
Clean eyepiece lenses. ***
7
SOLUTION
switches
and
intensity
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