15
6
．
Troubleshooting Guide
BM-300
1.
Optical System
TROUBLE
CAUSE
SOLUTION
The nosepiece is not in the located position
(objective and light path not coaxial)
Locate the nosepiece properly
where it clicks
The surface of the lamp becomes black
Change a new lamp bulb
1.The edge of the field of
view is dark or the brightness
is not uniform
A lens (the objective, condenser, eyepiece or
collector) is dirty.
Clean it thoroughly
Dirt/dust on the specimen
Replace with a clean specimen
2. Dirt or dust is visible in
the field of view
Dirt/dust on the eyepieces
Clean them
Specimen is not covered
Add cover glass on it
The thickness of the cover glass is not
suitable
Use standard cover glass with
thickness of 0.17mm
Specimen is placed reversely
Turn it over
Dry objective has oil on it. (especially for
40X objectives)
Wipe the oil
A lens (the objective, condenser, eyepiece or
collector) is dirty.
Clean it
Immersion oil is not used with the 100x
objective
Use specified oil
Air bubbles existed in the immersion oil
Eliminate the bubble
The aperture iris diaphragm is stopped down
too far
Adjust the aperture iris
diaphragm properly
3.Visibility is poor
Image is not sharp;
Contrast is poor;
Details are indistinct
Dirt or dust on the eyepiece
Clean it
Condenser is not properly centered
Center the condenser with the
centering screw
The nosepiece is not properly engaged
Engage the nosepiece properly
4.One side of image is
blurred
The specimen is not clamped
Clamp it with stage clips
5.The image is yellowish
The blue filter is not used
Use the blue filter
The aperture iris diaphragm is too small
Adjust it properly
The condenser is too low
Adjust it properly
6.The brightness is not
enough
A lens (the objective, condenser, eyepiece or
collector) is dirty.
Clean it
