17
The image shift
during focusing
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
（
including condenser,
objective, eyepiece and collector
）
Clean it up
2. Mechanical system
TROUBLE 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 touch
the specimen when
changed from 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
The binocular image is
not coincident
The interpupillar distance is not correct
Adjust it
Eyes are too tired
No diopter adjustment
Adjust the diopter correctly
The brightness is not suitable
Adjust the voltage of the lamp
3. Electrical system
TROUBLE CAUSE
SOLUTION
The lamp can’t light
when the switch is
turned on
No power
Check the connection of the
power cord
The bulb is not inserted
Insert it correctly
The bulb burns out
Replace it
The lamp burns out
suddenly
Use a substandard lamp
The voltage is too high
Use the specified lamp to replace,
if the problem is not solved,
contact with the service department
The brightness is not
enough
Use a substandard lamp
The voltage is too low
Use the specified lamp
increase the voltage
