Troubleshooting
11
Fein
TROUBLE
POSSIBLE CAUSE
SOLUTION
Field of view is dark
even when light is on
The field diaphragm is not large enough.
Enlarge the field diaphragm
Condenser is too low.
Adjust the position of condenser.
The edge of the field
of view is dark or not
even.
The nosepiece is not in the right position.
Turn the nosepiece into the right
position.
Stain or dust has accumulated on the lens such
as condenser, objective, or eyepiece.
Clean the lens.
Stain or dust is
observed in the field
of view.
Stains have accumulated on the specimen.
Clean the specimen.
Stains have accumulated on the lens.
Clean the lens.
Glare or hot spot on
observed image.
Condenser is set too low.
Raise condenser.
Aperture iris diaphragm is closed too much.
Open aperture iris diaphragm.
Unclear image
There’s no cover glass on the specimen.
Add the cover glass.
The cover glass is not standard.
Use a standard cover glass with
thickness of 0.17mm.
The slide is upside down.
Adjust the slide.
The immersion oil has accumulated on the dry
objective.
Clean the objective thoroughly.
The immersion oil is not being used for oil
objective.
Use immersion oil.
Air bubble is in the immersion.
Get rid of the air bubbles.
The aperture diaphragm is not opened
correctly.
Adjust the aperture diaphragm.
Stain or dust has accumulated on the eyepiece
lens.
Clean the lens.
The condenser is too low.
Adjust the condenser.
One side of the field
of view is dark or the
image moves while in
focus.
The specimen is not fixed.
Fix the specimen.
The nosepiece is not in the right position.
Turn the nosepiece into the right
position.
Condenser centered incorrectly.
Center the condenser.
The eyes feel tired
easily. The right
field of view doesn’t
superpose with the
left.
Interpupillary distance is wrong.
Adjust the interpupillary
distance.
Eyepieces for the left eye and right eye are
different.
Use the same eyepiece.
