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13
6.
Troubleshooting Guide
GENERAL PROBLEMS
Problem
Cause
Solution
Lamp does not light
when switched on
No electrical power
Check power cord connection
LED or power unit dead
Contact seller for service
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
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
Condenser aperture is closed or open
too much
Open or close properly
Condenser is positioned too low
Position the condenser upward
Specimen rises from stage surface
Secure the specimen in the slide holder
Revolving nosepiece is not in the
click-stop position
Revolve the nosepiece to the click-stop
position
Lamp intensity is too high or low
Adjust the light intensity by rotating the
intensity control dial
