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8.0 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 Plug no connect
Put the plug to the microscope
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
Dust or dirt on lenses (objectives,
eyepieces)
Clean thoroughly
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 specimen is out of place (tilted)
Place the specimen flat on the stage.
II. Mechanical Section:
The 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. 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.
