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11. Troubleshooting
Review the information in the table below to troubleshoot operating problems.
PROBLEM
CAUSE
SOLUTION
I. Optical Section:
LED operates, but field of view re
-
mains dark.
Power supply is unplugged.
Connect
Brightness is too low
Set brightness to a proper level
Dirt or dust is visible in the field of
view.
Dirt/dust on the specimen
Clean the specimen
Dirt/dust on the eyepieces
Clean the eyepieces
Image looks double
Aperture diaphragm is stopped
down too far
Open aperture diaphragm
Visibility is poor.
•
Image is not good.
•
Contrast is poor.
•
Details are indistinct.
•
Image glares
Revolving nosepiece is in an
incorrect position
Move the nosepiece to a click stop
Aperture diaphragm is too closed
or to open
Adjust aperture diaphragm
Dust or dirt on lenses (condenser,
objectives, eyepieces and slide)
Clean thoroughly
For transmitted light observation,
the coverglass thickness must not
exceed 0.17mm
Use a coverglass with thickness 0.17mm
Focus is not even
Slide holder is not flat. Move the specimen
to a flat position
One side of the image is out of focus.
The nosepiece is not in the center
of the light path
Turn the nosepiece to a click stop
The specimen is out of place
(tilted)
Place the specimen flat on the stage.
The optical performance of the
sample cover glass is poor
Use a cover glass of better quality
II. Mechanical Section:
The coarse focus knob is hard to
turn.
The tension adjustment collar is
too tight
Loosen the tension adjustment collar
The focus is unstable.
The tension adjustment collar is
too loose
Tighten the tension adjustment collar
III. Electric section
The LED doesn’t turn on.
No power supply
Check the power cord connection
The brightness is not enough
The brightness adjustment is low
Adjust the brightness
The light blinks
The power cord is poorly con
-
nected
Check the power cord
IV. Observation tube
Field of view of one eye does not
match that of the other.
Interpupillary distance is incorrect. Adjust interpupillary distance.
Incorrect diopter adjustment
.
Adjust diopter
.
Your view is not accustomed to
microscope observation.
Upon looking into eyepieces, try looking at
overall field before concentrating on speci
-
men range. You may also find it helpful to
look up and into distance for a moment
before looking back into microscope
.
