5
MAINTENANCE
WARNING: For your own safety, turn switch off and remove plug from power source before
maintaining your microscope. If the power cord is worn, cut or damaged in any way, have it replaced
immediately to avoid shock or fire hazard.
1. OPTICAL MAINTENANCE
A. Do not attempt to disassemble any lens components. Consult a microscope service technician when
any repairs not covered by instructions are needed.
B. Prior to cleaning any lens surface, brush dust or lint off lens surface using a camel hair brush. You can
also use an ear syringe or canned compressed air, such as that sold by most computer stores.
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. ELECTRICAL MAINTENANCE
To replace the extra long life LED transmitted (bottom) illuminator bulb.
A. First remove the glass/plastic stage plate from the top of the base stand.
B. Inside you will notice the 3-Watt LED bulb.
C. Using a Phillips screw driver remove two each 3mm Phillips head screws securing the LED to heatsink
plate.
D. Using a Philips screw driver, remove the 4 rubber feet screws securing black plastic illuminator base to
the microscope pole -base.
E. Carefully unplug the LED bottom light connector (attached to socket marked LED) from circuit board.
F. Remove LED bulb through the heatsink plate and replace assembly with #800-425 LED bulb.
G. Replace lamp mounting screws (2 ea), light housing screws (3ea), lamp bracket mounting screws and
nuts (2ea)
H. 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
microscope focusing block by loosening the black knurled knobs located on the back side of the post and
unplug the power cord from the vertical post. Return the focus block to National for replacement of the
LED bulb.
