101
V. Troubleshooting
Problem
The image is tinged
yellow.
The image is too bright.
The brightness is
insufficient. (Refer to the
troubleshooting for the
electric system too.)
Diascopic
microscopy
The objective hits the
specimen when switched from
low to high magnification. The
specimen goes out of focus
when switching objectives.
The specimen does not
move smoothly.
When viewing through the
binocular eyepiece, the
image does not resolve
into a single image.
Eye strain develops
while viewing.
Countermeasure
Locate the NCB 11 filter into the
optical path.
(p. 44)
Increase the brightness with the
brightness control switch, and then
adjust the brightness with ND filters.
(p. 42 and 44)
Adjust the brightness with the brightness
control switch. Or, locate a ND filter
into the optical path.
(p. 42 and 44)
Adjust the brightness with the
brightness control switch.
(p. 42)
Remove the ND filter from the optical
path.
(p. 44)
Open the diaphragm to a suitable size.
(p. 51 and 54)
Remove the polarizer, the analyzer, or
the PA block from the optical path.
(p. 56 to 61)
Replace the light source to brighter one.
(p. 89)
Use the designated objective.
(p. 38, 39, 43, and 93)
Darken the room.
Adjust the condenser focus knob so that
the field diaphragm image is focused on
the specimen surface.
(p. 53)
Adjust the diopters.
(p. 49)
Mount the eyepieces correctly by
aligning the positioning grooves. (p. 93)
Secure the specimen holder correctly.
(p. 77)
Adjust the interpupillary distance.
(p. 49)
Adjust the diopters.
(p. 49)
Adjust the distance.
(p. 49)
Adjust the diopters.
(p. 49)
Adjust the brightness with the brightness
control switch or ND filters. (p. 42 and 44)
Use eyepieces having the same
viewfield number.
Cause
The NCB11 filter is not used.
The lamp voltage is too low.
The lamp voltage is too high.
The lamp voltage is too low.
A ND filter is placed in the optical path.
The aperture diaphragm is stopped
down too far.
A polarizer, analyzer, or PA block is placed
in the optical path although the bright-field
microscopy is intended to be performed.
A halogen lamp is used for a dark
specimen.
The used objective is not suitable for
the microscopy.
The room is too bright. (for the dark-field
microscopy or the epi-fl microscopy)
The condenser position is too low.
The eyepiece diopters are not adjusted.
The eyepieces are not attached
correctly.
The specimen holder is not secured
correctly on the stage.
The interpupillary distance is not
adjusted.
The eyepiece diopters are not adjusted.
The interpupillary distance is not adjusted.
The eyepiece diopters are not adjusted.
The brightness is not appropriate.
Eyepieces with different viewfield numbers
are used for the left and right eyes.
