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12. Troubleshooting
Review the information in the table below to troubleshoot operating problems.
PROBLEM
CAUSE
SOLUTION
I. Optical Section:
LED operates, but field of view remains
dark.
Power supply is unplugged.
Connect
Brightness is too low
Set brightness to a proper level
Batteries are uncharged
Fully charge the batteries
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, ob
-
jectives, eyepieces and slide)
Clean thoroughly
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
Batteries are uncharged
Fully charge the batteries
The brightness is not enough
The brightness adjustment is low
Adjust the brightness
The light blinks
The power cord is poorly connected
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 micro
-
scope observation.
Upon looking into eyepieces, try look
-
ing at overall field before concentrating
on specimen range. You may also find
it helpful to look up and into distance
for a moment before looking back into
microscope.
