SE300 Series
Troubleshooting
18
Common Issues (Optical)
Symptom
Cause
Solution
OPTICAL ISSUES
Obstructions are
observed in the field
of view
Stains, dust, or dirt has accumulated on the speci-
men
Clean the slide or use a new specimen if sample is
destroyed
Stains, dust, or dirt have accumulated on the
lenses
Clean the objective and eyepiece lenses
Unclear Image
Stain or dust has accumulated on the lens in the
inlet of the head
Clean the lens with lens cleaner or a nonabrasive
lint free cloth, as well as spray with compressed air
The microscope head is not in the right position
to be focused
Adjust the height of the microscope with the focus-
ing knob on the focusing rack until image appears
in focus.
Note:
Higher magnification will require
the head to move closer, while lower will require
more distance between the sample and the lens.
One side of the field
of view is dark or the
image moves while
focusing
The specimen is not fixed
Secure the slide to the stage with clips or another
manner so that the sample does not move
The field of view is not
bright enough
The light source is not present
A light source must be used with this model micro-
scope to view a sample (ring light, built in illumina-
tor, or gooseneck illuminator)
The light source is too dim
The light source used is not bright enough, or is set
to too low of an intensity setting. Adjust setting to a
higher or change light sources
Stains, dust, or dirt has accumulated on the con-
denser, objective, eyepieces, or base lens
Thoroughly clean tall lenses with lens cleaner or
a lint free nonabrasive cloth
