10
Use a unsuitable oil
Change
to
the
specified one
The size of the aperture
diaphragm is too big
Minify it
There are stains on the incident
lens of the binocular tube
Clean it up
The size of the aperture
diaphragm is too small
Open it up
The position of the condenser is
too low
Adjust the position
One side of the image
is dark
The condenser is not in the
center of the field of view\the
condenser inclines
Install the condenser
again and adjust the
center carefully by the
centering bolt
The nosepiece is not in the right
position
Turning it until it reach
the “clicked” position
The specimen is floating Fix
it
The image shifts
during focusing
The specimen slips on the stage
Fix it
The nosepiece is not in the right
position
Turn it to the
“ clicked ”position
The image is a little
yellow
Not use the blue color filter
Use the blue filter
The brightness is not
enough
The size of the aperture
diaphragm is too small
Adjust again
The position of the condenser is
too low
Adjust the position
There are stains on the lens
（
include condenser, objective,
eyepiece and collector
）
Clean it up
2
、
Mechanical Part
Problem
Cause
Solution
The image can not
focus when using
high magnification
objective
The specimen is placed
inversely
The coverslip is too thick
Turn inversely
Use the standard coverslip
（
0.17 mm
）
The objective and the
specimen touch
when change the low
magnification to the
higher magnification
The specimen is placed
inversely
The coverslip is too thick
Turn inversely
Use the standard coverslip
（
0.17 mm
）
The specimen is
not easy to move
The specimen holder is not
fixed
Fix it
