The nosepiece is not in the right position
Turning it until it reach
the “clicked” position
The specimen is floating
Fix it
The image shift
during focusing
The specimen slips on the stage
Fix it
The nosepiece is not in the right position
Turn it to the “ clicked
”position
The image is a little
yellow
Not use the blue color filter
Use the blue filter
The brightness is
not enough
The size of the aperture diaphragm is too
small
Adjust again
The position of the condenser is too low
Adjust the position
There are stains on the lens
（
including
condenser, objective, eyepiece and
collector
）
Clean it up
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BIOLOGICAL MICROSCOPE