Troubleshooting - Unitron MEC4 Manual

TROUBLESHOOTING

Under certain conditions, performance of this unit may be adversely affected by factors other than defects. If a
problem occurs, please review the following list and take remedial action as needed. If you cannot solve the
problem after checking the entire list, please contact your local dealer for assistance.
OPTICAL
PROBLEM
The illumination is on, but the
field of view is dark.
The edge of the field of view is
obscured or not evenly
illuminated.
Dirt or dust is visible in the field
of view
The image glares
Visibility is poor

Image is not sharp

Contrast is poor

Details are indistinct
One side of the image is
blurred
MECHANICAL PART
PROBLEM
The coarse adjustment knob is
too difficult to rotate
The image goes out of focus
during observation
UNITRON
MEC4 INVERTED METALLURGICAL MICROSCOPE
CAUSE
The bulb is burnt out.
The brightness is set too low
Too many filters are in the optical path
The nosepiece is not in the located position
the color filter is not inserted fully
Dirt/dust on the specimen
Dirt/dust on the eyepiece
The iris diaphragm is closed too much
The objective is not correctly engaged in the
light path
the aperture diaphragm is opened or stopped
down too far in brightfield observation
The lens (condenser, objective, eyepieces)
are dirty
The objective is not in the center of the light
path
The specimen is not correctly mounted on the
stage.
CAUSE
The tension adjustment ring is tightened too
much
The tension adjustment collar is too loose
SOLUTION
Replace it with a new one
Set it to the appropriate position
Reduce them to the minimum required
number
Turn the nosepiece into the position where
you can hear it engaged
Push it in all the way
Replace with a clean specimen
Clean the eyepieces
Open up the iris diaphragm
Turn the nosepiece into the engaged position
adjust the aperture diaphragm properly
Clean it thoroughly
Insure the nosepiece is in the "clicked"
position
Place the specimen on the stage correctly.
SOLUTION
Loosen it appropriately (p. 12, Fig. 10)
Tighten it appropriately (p. 12, Fig. 10)
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