Troubles
Causes
Remedies
c)
Light fl ickers
and
the in· Mains voltage
is
unstable.
Use
a voltage stabilizer.
tensity
is
unstable.
Filament
of
the
bulb
is
likely
to
Replace the bulb.
burn out.
Loose
electrical connection. Secure the connection.
dl
Fuse
burns
out
too
often.
Fuse
is
not a standard fuse.
Use
a standard fuse.
Voltage
selector switch
is
not
Set the switch to match the mains
matched with the mains voltage. voltage.
e)
Bulb does
not
light. Bulb
is
burned out. Replace the bulb.
Loose
electrical connection. Secure the connection.
f)
Reduced bulb life.
Voltage selector
switch
is
not
Set the selector switch to match
matched with the mains \loltage. the mains voltage.
Bulb
is
not a standard one.
Use
a standard bulb.
Bulb
was
over vol ted too long. Reduce
bulb
voltage.
3. Focusing
a)
Coarse
adjustment
is
too
Tension adjustment
ring
is
tighten- Loosen the tension adjustment ring
tight.
ed
too much. slightly.
User
is
trying to
raise
the
stage,
pas-
Unlock the pre-focusing lever.
sing
over the upper focusing limit
imposed by the
engaged
pre-focus-
ing
lever.
b)
Stage drops and the speci- Tension adjustment ring
is
too
Tighten the ring slightly.
men
goes
out
of
focus.
loose.
c)
Stage cannot
be
raised
to
Pre-focusing lever
is
engaged
in
Unlock the pre·focusing lever.
the upper limit.
lower than focusing position.
dl
Stage
cannot be lowered
Substage
is
lowered
to
much.
Raise
the
substage.
to the lower limit
of
the
working
range.
el
Objective front
lens
touch-
Specimen
is
mounted on the
stage
Reverse the specimen.
es
the specimen. upside down.
4.
Binocular Observation Tube
al
Incomplete binocular
vi-
Interpupillary distance
is
not cor-
Correct the interpupillary distance.
sion.
rectlyadjusted.
Diopter adjustment
is
incomplete. Complete the diopter adjustment.
Right and
left
eyepieces
are
not
Use
a pair
of
matched eyepieces.
matched.
User
is
unaccustomed to binocular Prior to looking at the image of the
vision.
specimen,
try
to look at the entire
field
of
view, or look at a far away
object before resuming microscopic
observation.
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