10
VII.Trouble shooting
Fault
Cause
Disposition
Electric system
No light shown in the field
of view using halogen
lamp
The power switch is not turned
on.
Turn on the power switch.
The halogen lamp is damaged. Replace the halogen lamp.
The fuse is damaged.
Replace the fuse.
The connector of the electric
chassis is in bad contact.
Check and have professional repair it.
The halogen lamp mounted is
nonconforming.
Use a conforming halogen lamp.
Optical system and imaging
There is a black shadow
on the edge of the field of
view
or
unevenly
illuminated, making it
impossible to observe the
whole field of view.
The nosepiece has not been
turned to the fixed position.
Turn the nosepiece to the fixed position.
The filament image deviates
from the center of the collector. Reposition the lighting bulb.
There is dirt or oil on the
surface of the objective,
eyepiece or condenser
Wipe the lens surface or replace the
lens.
Oil or dust is found in the
field of view.
There is oil or dust on the
eyepiece lens.
Wipe the eyepiece.
Defocusing
or
low
resolution
The objective is damaged.
Repair the objective (by a professional).
There is oil or dust on the
surface of the lens of the
objective or eyepiece.
Wipe the objective or the eyepiece.
The aperture of the aperture
diaphragm is too small.
Adjust the aperture of the aperture
diaphragm based on the objective
magnification (or numerical aperture)
used.
The objective deviates from
the light path.
Turn the nosepiece to the fixed position.
The focal plane of the
image is inclined (brighter
on one side and darker on
the other)
The lighting bulb is seriously
inclined.
Reposition the lighting bulb.
The specimen is not laid flatly. Lay the specimen flatly on the object
stage and hold it stably.
Mechanical system
The image cannot remain
clear during observation.
The focusing mechanism flows
(slides down) automatically.
Adjust the coarse adjusting hand wheel.
The fine focusing mechanism
fails
Check and have professional repair it.
The stage loosens or is
inclined.
Check and have professional repair it.
