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9
5.
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
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
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
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
Slippage of focus
when using the
coarse focusing
knob Fine focus
is ineffective
Tension adjustment is set too low
Increase the tension on the focusing
knobs
Tension adjustment is set too high
Loosen the tension on the focusing
knobs
