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13
6.
Troubleshooting Guide
Problem
Cause
Solution
Lamp does not
light when
switched on
No electrical power
Check power cord connection
LED or power unit dead
Replace LED light
Fuse blown out
Replace fuse
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 field iris diaphragm are not
opened enough
Open field diaphragm
The field diaphragm not in the center
Center the field iris diaphragm
Dirt or dust on the
view
Dirt or dust on the eyepiece,
condenser, objective, collector lens
or specimen
Clean the lens with a lens cleaning paper
Poor image
quality or not able
to get focused
image
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
(specimen at the bottom)
Turn slide over so the cover-glass faces
up
Diopter adjustment is not set
properly
Readjust the diopter settings
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
Aperture is closed or open too much
Open or close properly
Condenser top lens not in use
Flip up the top lens when using high
power objective
Condenser is not in the right position
Adjust the condenser
The field diaphragm not in the
center
Center the field iris diaphragm
