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OPTICAL PROBLEMS
Problem
Cause
Solution
Darkness at the
periphery or
uneven brightness
in the field of view
Revolving nosepiece not in click
stop position
Revolve the nosepiece to click-stop
position by swinging the objective
correctly into the optical path
The bulb of light source is not at
the center
Adjust the position of the bulb if
possible
Dirt or dust on the
view
Dirt or dust on the eyepiece,
condenser, objective, collector
lens or specimen
Clean the lens with a camera
cleaning kit
No slide cover attached to the
slide
Attach a 0.17mm slide cover
Slide cover is too thick or thin
Use a slide cover of the appropriate
thickness (0.17mm)
Slide may be upside down
Turn slide over so the cover-glass
faces up
Poor image quality Immersion oil is on a dry
objective (especially the 40x)
Check the objectives, clean if
necessary
No immersion oil used with 100x
objective
Use immersion oil
Air bubbles in immersion oil
Remove bubbles
Condenser aperture is closed or
open too much
Open or close properly
Condenser is positioned too low Position the condenser upward
ELECTRICAL PROBLEMS
Problem
Cause
Solution
Lamp does not
light when
switched on
No electrical power
Check power cord connection
Lamp bulb burnt out
Replace bulb
Fuse blown out
Replace fuse
