Chapter 2 Troubleshooting
26
Troubleshooting
1
Optical System and Operation
1.1
General
Problem Cause Measure
Dirt or dust rotates when the eyepiece is turned.
The eyepiece is dirty.
Clean the eyepiece.
(→See Chapter 3, “2.1 Cleaning Lenses” in the
“Assembly/Maintenance”.)
Dirt or dust does not rotate when eyepiece is
turned
(1) to (5)
(1) The specimen is dirty if dirt or dust moves
when the specimen is moved on stage.
(1) Clean the specimen.
(2) The tip of the condenser lens is dirty if dirt
or dust goes in and out of view when the
condenser is moved up and down while
using a low magnification objective.
(2) Clean the condenser.
(→See Chapter 3, “2.1 Cleaning Lenses” in the
“Assembly/Maintenance”.)
(3) The objective is dirty if dirt or dust
disappears when the objective is switched.
(3) Clean the objective.
(→See Chapter 3, “2.1 Cleaning Lenses” in the
“Assembly/Maintenance”.)
(4) The field diaphragm image is not focused
on the specimen surface. (Condenser
adjustment is incorrect)
(4) Make sure the condenser is focused and
centered.
(See Chapter 3, “5 Focusing and Centering the Condenser”
in the “Operation”.)
Dirty or dusty field of view
when looking into eyepiece.
(5) An aperture diaphragm is stopped down
too far.
(5) Open it to proper size.
(→See Chapter 3, “6 Adjusting the Aperture Diaphragm” in
the “Operation”.)
Dirt or dust on the monitor moves when the
camera is turned
Lens or specimen is dirty or dusty. Check and clean it in accordance with the “Dirt or dust
does not rotate when eyepiece is turned” of “Dirty or
dusty field of view when looking into eyepiece”.
Dirt or dust on the monitor does not move when
the camera is turned
Dirt or dust appears on the
monitor.
The camera is dirty. Remove the camera and clean it in accordance with
the camera's instruction manual.
No cover glass is attached.
The thickness of the cover glass is inadequate.
Attach a cover glass of the specified thickness (0.17
mm). (However, no cover glass is required for an
NCG objective.)
A high magnification objective appropriate for
hemocytometer cover glass thickness (0.4 mm,
0.7 mm) is not used.
Use the high magnification objective (e.g. CFI LWD
40xC) appropriate for observation using thick cover
glass.
The objective correction ring does not match the
thickness of the cover glass. (for the objective
with a correction ring)
Correct the ring as appropriate.
Image quality is poor.
Contrast is poor. Resolution
is poor.
The lens and specimen are dirty or dusty.
Check and clean them in accordance with “Dirt or
dust does not rotate when eyepiece is turned” of
“Dirty or dusty field of view when looking into
eyepiece”.
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