22
Problem
Cause
Remedy
Page
2. Focus adjustment mechanism
a) The tension of coarse adjustment
knob it too high.
The coarse adjustment knob rotation
tension adjustment ring is set too tight.
Loosen the ring to adjust to proper
tension.
b) The stage lowers by its own weight
or focusing is lost due to slippage
of the knob.
The coarse adjustment knob rotation
tension adjustment ring is set too
loose.
Tighten the ring to adjust to proper
tension.
c) Coarse focus adjustment cannot
raise the stage high enough.
The pre-focusing knob limits the stage
at a low position.
Raise the limiting position of the pre-
focusing knob.
d) Coarse focus adjustment cannot
lower the stage low enough.
The condenser holder is too low.
Raise the condenser holder.
e) Objective hits the specimen before
accurate focusing is obtained.
The specimen is upside down.
Set the specimen correctly.
3. Binocular observation tube
a) Fields of view of two eyes do not
match.
The interpupillary distance is not ad-
justed properly.
Adjust it properly.
Diopter compensation for the two eyes
is not set.
Adjust it correctly.
The left and right eyepieces are dif-
ferent.
Do not stare at the image immediately
after placing your eyes on the eye-
pieces. First take a look at the entire
field of view. Removing your eyes once
from the eyepieces and placing them
again may also work.
4. Stage
a) Rotating the stage renders the
specimen invisible.
The rotary stage or centering adapter
for objective lens is not centered.
Center them.
5. Objective switching mechanism
a) Objective hits the specimen when
an objective is switched to a higher-
magnification objective.
The specimen is upside down.
Set the specimen correctly.
The cover glass is too thick.
Use a cover glass with thickness of
0.17 mm.
6. Electrical system
a) Lamp bulb does not light.
Lamp bulb is not mounted.
Attach a bulb.
Lamp bulb is blown.
Replace the bulb.
The power cord is unplugged.
Plug it securely.
b) Lamp bulb blows easily.
The specified bulb is not used.
Replace with a designated bulb
9
9
9
13
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9
9
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16/17
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12
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