Optika Italy B-190 Serie Manuel D'utilisation page 19

14. Troubleshooting
Review the information in the table below to troubleshoot operating problems.
PROBLEM
I. Optical Section:
LED operates, but field of view remains
dark.
Dirt or dust is visible in the field of view. Dirt/dust on the specimen
Image looks double
Visibility is poor.
• Image is not good.
• Contrast is poor.
• Details are indistinct.
• Image glares
One side of the image is out of focus.
II. Mechanical Section:
The coarse focus knob is hard to turn.
The focus is unstable.
III. Electric section:
The LED doesn't turn on.
The brightness is not enough
The light blinks
IV. Observation tube:
Field of view of one eye does not match
that of the other.
V. Microphotography:
Image edge is unfocused
Bright spots appear on the image
CAUSE
Power supply is unplugged.
Brightness is too low
Dirt/dust on the eyepieces
Aperture diaphragm is stopped down
too far
Revolving nosepiece is in an incorrect
position
Aperture diaphragm is too closed or to
open
Dust or dirt on lenses (condenser, ob-
jectives, eyepieces and slide)
For transmitted light observation, the
coverglass thickness must not exceed
0.17mm
Focus is not even
The nosepiece is not in the center of
the light path
The specimen is out of place (tilted)
The optical performance of the sample
cover glass is poor
The tension adjustment collar is too
tight
The tension adjustment collar is too
loose
No power supply
The brightness adjustment is low
The power cord is poorly connected
Interpupillary distance is incorrect.
Incorrect diopter adjustment.
Your view is not accustomed to micro-
scope observation.
To a certain extent it is due to achro-
matic objectives features
Stray light entering in the microscope
through eyepieces or camera viewfind-
er.
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SOLUTION
Connect
Set brightness to a proper level
Clean the specimen
Clean the eyepieces
Open aperture diaphragm
Move the nosepiece to a click stop
Adjust aperture diaphragm
Clean thoroughly
Use a coverglass with thickness
0.17mm
Slide holder is not flat. Move the spec-
imen to a flat position
Turn the nosepiece to a click stop
Place the specimen flat on the stage.
Use a cover glass of better quality
Loosen the tension adjustment collar
Tighten the tension adjustment collar
Check the power cord connection
Adjust the brightness
Check the power cord
Adjust interpupillary distance.
Adjust diopter.
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.
To minimize the problem, set the aper-
ture diaphragm in a proper position
Cover eyepieces and viewfinder with a
dark cloth