20
6. TROUBLESHOOTING TABLE
As you use your microscope, you may occasionally experience a technical question.
The troubleshooting table below contains the majority of frequently encountered problems and the
possible causes.
1. Optical
Problem Possible
Cause
Vignetting or uneven brightness in the field of
view or field of view only partially visible
Lamp not installed properly or lamp dirty
Frost glass is not placed in properly
Use error specimen ( low reflection)
Aperture diaphragm is too small
Polarizing inset not on the orientation position
Nosepiece is not on the orientation position
Light path is not in position on the levers of switch
orientation
Field of view dirty
Dust on specimen surface
Dust on objective, filter, condenser or eyepiece
Poor image quality ( low resolution, poor
contrast)
Lower brightness or incorrect illumination
Aperture diaphragm is not match with objective
aperature
Use the cover glass specimen
Dust or scratch on objective lens surface
Grease on eyepiece
Image tilting
Stage surface tilting
Specimen holder did not orientate correctly on
stage
Slide did not orientated in correct position
Image tinged yellow
Low voltage of bulb
Check use of blue filter
Insufficient parfocality of objectives
Check adjustment of the eyepiece diopter
No cohesion of binocular image
Left right eyepiece magnification or the field of view
spec is different
Check interpupillary distance is correctly adjusted
Check adjustment of the eyepiece diopter