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Troubles
( f ) Reduced bulb life.
Causes
The voltage selector switch is not
matched to the mains voltage.
The bulb is not a standard bulb.
Mains voltage is too high.
Remedies
.
Match the selector switch to the
mains voltage.
Use a standard bulb.
Use the tungsten bulb under 6V as
well as possible, or use a high
intensity bulb, such as a halogen
bulb.
3. Focusing
(a) Coarse adjustment is too
tight.
(b)The stage drops and the
specimen goes out of focus.
(c) The stage cannot be raised
t o the upper limit.
(d)The stage cannot be lower-
ed to the lower limit of
the working range.
(e)The objective front lens
hits against the specimen,
Tension adjustment ring is tighten-
ed too much.
The user is trying to raise the stage
passing over the upper focusing
limit imposed by the engaged pre-
focusing lever.
The tension adjustment ring is too
loose.
Automatic pre-focusing lever is en-
gaged in lower than focusing posi-
tion.
The condenser mount is lowered
too much.
The specimen is mounted on the
stage upside down.
Loosen the tension adjustment ring
properly.
Unlock the pre-focusing lever.
Tighten the ring properly.
Unlock the pre-focusing lever.
Raise the condenser mount.
Reverse the specimen.
4. Observation Tube
Correct the interpupillary distance
Complete the diopter adjustment.
Use a pair of matched eyepieces.
Prior to looking at the image of the
specimen, try to look the entire
field of view, or look at a far away
object before resuming microscopic
observation.
(a) l ncomplete binocular vi-
sion.
lnterpupillary distance is not cor-
rectly adjusted.
Diopter adjustment is incomplete.
Right and left eyepieces are not
matched.
The user is unaccustomed with a
binocular vision.
5. Stage
Clamp the stage securely.
Adjust the specimen position.
( a ) The image easily goes out
of focus when you touch
-B
the stage.
(b)The specimen stops mid-
way on the east-west trav-
erse.
The stage is not correctly clamped.
The specimen is not correctly posi-
tioned on the stage.