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5. Troubleshooting
5.1 Optical Parts
PROBLEM
REASON FOR PROBLEM
SOLUTION
Light is on but the field of view
is dark.
The aperture or field iris diaphragm is
closed.
Open the aperture and field iris diaphragms.
Light path selector control of trinocular tube
is positioned incorrectly.
Fully pull out the light path selector control.
Mirror selector lever is in an intermediate
position.
Set the control correctly.
Field of view is obscured or not
evenly illuminated.
Light path selector knob of trinocular tube is
in positioned incorrectly.
Set the light path selector control to a ‘click’ position.
Mirror selector lever is in an intermediate
position.
Set the control correctly.
Revolving nosepiece is not in a ‘click’
position.
Set it into the ‘click’ position.
Field iris diaphragm is not centred.
Centre the field iris diaphragm correctly and make sure it is
sufficiently open.
ND filter is not in a click position.
Set it into the ‘click’ position.
Bulb is not installed correctly.
Make sure the halogen bulb is in the correct position and
touching both terminals.
Analyser and/or polariser not installed
correctly.
Engage analyser and polariser in light path.
Dirt or dust is visible in the field
of view.
Dirt/dust on eyepiece.
Clean thoroughly with a lens cloth or lint free cloth.
Dirt/dust on specimen.
The image is out of focus /
low-resolution
Revolving nosepiece is not in a ‘click’
position.
Set it into the ‘click’ position.
The objective lens has been contaminated.
Clean thoroughly.
Dirt/dust on specimen.
One side of image is blurred.
Objective is not correctly engaged in light
path.
Make sure that revolving nosepiece clicks into place
correctly.
