Troubles
Causes
Remedies
bl
Dust
or
dirt
is
visible in Dust or
dirt
on
the
glass
surface
at
the field
of
view. the light
exit
on
the
base.
Dust
on
condenser top
lens.
Remove dust or dirt.
Dirty
specimen.
Dust
on
eyepiece.
cl
Excessive
image contrast.
Condenser
is
lowered excessively. Raise the condenser.
Aperture iris diaphragm
is
stopped Open the diaphragm.
down excessively.
dl
Resolution problems:
Objective
is
not correctly position- Slightly
rotate the nosepiece until
ed
in the light path.
it
clicks into position.
·
I
mage
is
not sharp.
·
Insufficient contrast.
Dirt
on
objective
front
lens.
Clean the objective.
·
Image
details lack
de-
finition.
Immersion objective
is
used
with-
Apply
immersion oil.
out immersion oil.
Bubbles in the immersion oil.
Remove bubbles.
Olympus immersion oil
is
not
used.
Use
Olympus immersion oil.
Dirty
specimen.
Dust
on
eyepieces and condenser
Clean.
top
lens.
e)
Field of view
is
partially Objective
is
not correctly position-
Slightly
rotate the nosepiece until
out
of
focus.
ed
in the Iight path.
it
clicks into position.
Specimen
is
not correctly position- Place the specimen on the
stage
and
ed
on
the
stage.
secure
it
with the specimen holder
or
stage
clips.
f)
When objectives are
chang~
Mechanical tube
length
is
not cor-
Adjust
with
the
tube
length adjust-
ed
they are not parfocal.
rectly adjusted.
ment
rings
on
the observation tube.
g)
Light
intensity does
not
Condenser
is
lowered excessively.
Raise
the condenser.
increase although the volt-
Rheostat trimmer screw
is
not cor- Adjust
it
correctly.
age
is
raised.
rectlyadjusted.
2.
Electric System
a)
Illuminator
is
too
bright Voltage
selector switch
is
not
Set the switch
to match the mains
(or
too
dark). matched with the mains voltage voltage.
(for
CHA).
Mains voltage
is
too
high (or
too
Adjust
the mains voltage with
a
low).
variable voltage transformer.
Rheostat trimmer screw
is
not cor- Adjust
it
correctly.
rectly adjusted.
bl
Output
voltage
for
the
11-
Voltage
selector switch
is
not
Set the switch to match the mains
luminator cannot
be
reg-
matched with the mains voltage voltage.
ulated.
(for
CHAI.
Mains voltage
is
too
low
(or too Adjust the
mains voltage with a
high).
variable voltage transformer.
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