Olympus CHA-P Buku Petunjuk - Halaman 17
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Troubles
Causes
Remedies
Dirty specimen.
Dust on condenser lens.
Clean.
The field of view is par-
tially out of focus.
The
objective
is not correctly
po-
sitioned in the light path.
Slightly
rotate
the nosepiece
until
it clicks into position.
The specimen is not correctly posi-
tioned on the stage.
Place the specimen on the stage and
secure it with the specimen clips.
The
image
goes
out
of
focus eccentrically.
The
objective is not correctly posi-
tioned in the light path.
Slightly
rotate
the nosepiece
until
it clicks into position.
When
objectives
are
changed,
they
are
not
parfocal.
The
mechanical
tube
length
is not
correctly adjusted.
Adjust with the tube length adjust-
ment rings on the observation tube.
Light
intensity
does
not
increase
although
the
voltage is raised.
The
condenser
is lowered
exces-
sively.
Raise the condenser.
The
condenser does not
come
to the correct posi-
tion for optimum extinc-
tion.
The observation tube and condens-
er are not correctly mounted.
Re-mount them correctly.
No conoscopic image can
be seen.
The condenser top lens is not in
the light path.
Swing it in.
The
crossed
filter posi-
tion is not attained.
The
analyzer
is
out
of
the
light
path.
Push it in.
2. Electric System
(a) The
illuminator
is too
bright (or too dark).
The rheostat trimmer screw is not
matched to the mains voltage.
Adjust the trimmer screw to match
the mains voltage.
The
mains
voltage
is too high
(or
too low).
Adjust
the mains voltage with a
variable voltage transformer.
The rheostat trimmer screw is not
correctly adjusted.
Adjust it correctly.
(b) Output voltage for the il-
luminator
cannot be reg-
ulated.
The voltage selector switch is not
matched
to the mains voltage.
Adjust
the
mains voltage selector
switch to the mains voltage.
The mains voltage is too low or too
high.
Adjust
the
mains
voltage
with
a
variable voltage transformer.
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