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3. ELECTRICAL MAINTENANCE
WARNING: For your safety, turn switch off and remove plug from power source before
replacing bulb. Make sure that illuminator housing and lamp are cool before servicing.
A. Remove illuminator field lens housing by rotating in a counter-clockwise direction.
B. Note that the lamp does not screw out. Remove by depressing lamp slightly and rotating in a
counter-clockwise direction until it pops up slightly.
C. This model requires National #800-102 115v 20 watt bulb with D.C. (double contact) medium
bayonet base. This is a bulb specific to microscopes, and should be available from the dealer
from which you purchased the microscope.
D. Insert new bulb, gently depress into socket and rotate clockwise. Carefully wipe new bulb to
insure that it is clean and free of all fingerprints. Any dirt or oil on lamp surface will affect light
efficiency and bulb life.
E. Replace illuminator field lens housing assembly.
TROUBLESHOOTING PROCEDURES
PROBLEM
Light fails to operate.
Image does not focus
Image does not remain in focus
Poor resolution
(image not sharp)
Spots in field of view.
REASON FOR PROBLEM
Outlet inoperative.
AC power cord not connected.
Lamp burned out.
Disc diaphragm has not "clicked"
into proper position and is
blocking light source beneath
stage
Cover slip on specimen slide too
thick.
Rack stop not set at proper
position.
Slide upside down.
Stage of microscope drops from
its own weight.
Objective lenses dirty.
Eyepiece lens dirty.
Too much light.
Eyepiece lens dirty.
Specimen slide dirty.
6
SOLUTION
Have qualified service technician
repair outlet.
Plug into outlet.
Replace lamp.
Turn disc diaphragm until it
"clicks" into position.
Use 0.17mm thick cover slip.
(No. 1 cover slip)
Adjust rack stop.
Place slide on stage with cover
slip facing up.
Adjust tension control.
Clean objective lenses.
Clean eyepiece lenses.
Adjust disc diaphragm
Clean eyepiece lenses.
Clean slide.
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