Swift SW200DL User Manual page 6

Issue
Visual field is uneven, or
image is dark at the edges
Visual field is blurry or dirty
Poor image quality
Image moves while
adjusting focus
Light is too dim
Possible cause
Nosepiece is not locked in
place to center the
objective lens
Slide is not centered over
the bulb, leaving part of the
specimen unilluminated
Dirty objective or eyepiece
lens
Disc diaphragm hole
selection is too small
Dirty objective or eyepiece
lens
The slide is dirty
Eyepiece or objective lens
not fully screwed into place
No cover slip on the
specimen
Slide is too thick or too thin
Slide is placed upside
down on the stage
Dirty objective lens
Disc diaphragm hole
selection is too small
Slide is shifting on the
stage
Disc diaphragm hole
selection is too small
Solution
Turn nosepiece until you
hear a click to center the
objective lens
Center the slide over the
bulb
Clean with compressed air
or soft brush
Rotate the disc diaphragm
to a larger hole
Clean with compressed air
or soft brush
Clean the slide with glass
cleaner or lens cloth
Tighten eyepiece or
objective lenses
Place glass cover slip over
the specimen
Use a lab-quality slide
Flip the slide over so that
the cover slip is facing up
Wipe the lens off with soft
cloth and glass cleaner
Rotate the disc diaphragm
to a larger hole
Reposition slide more
securely in the clips
Rotate the disc diaphragm
to a larger hole
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