Ｖ
. Troubleshooting
62
Symptoms Causes Countermeasures
No ND filter in optical path. Put it in the optical path.
View field too
bright。
Lamp voltage too high. Lower the voltage with brightness adjustment dial.
Condenser aperture diaphragm stopped
down too far.
Normally, set to 70 to 80% of the objective N.A.
Field diaphragm image not focused on the
specimen surface.
Perform condenser focusing and centering correctly.
View field too
dark.
Optical path switchover dial not set to
100% observation.
Switch to 100% observation.
2. Operational
Symptoms Causes Countermeasures
Stage mounted incorrectly. Mount it correctly.
Image not in
focus although
the objective is
raised to the
highest position.
Objective refocusing ring clamped.
Release the clamp by turning the ring
counterclockwise to the limit.
Cannot focus with
20x and 40x
objective.
Bottom plate thickness of the container is
outside the correction range of the
objective.
Use container with bottom plate thickness within
correction range.
Images on the
left and right
eyepieces not
coincident.
Interpupillary adjustment not performed. Make adjustment.
Diopter adjustment not performed. Make adjustment.
Eye fatigue
Inadequate brightness. Adjust with brightness adjustment dial or ND filters.
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