Nikon eclipse fn1 Instructions Manual page 53

Problem
The brightness is insufficient.
(Refer to the troubleshooting
for the electric system too.)
The specimen goes out of focus
when the objectives are
switched.
The specimen movement is too
sensitive.
When viewing through the
binocular eyepiece, the image
does not resolve into a single
image.
Eye strain develops while
viewing.
Chapter 5 Troubleshooting
1 Viewing Problems and Control Problems
Cause
The lamp voltage is too low.
The aperture diaphragm is
stopped down too far.
The condenser position is too low.
The diopter adjustment has not
been performed.
Parfocal adjustment for objectives
has not been performed.
The torque for the stage handle is
adjusted too light.
The interpupillary distance has
not been adjusted.
The diopter adjustment has not
been performed.
The interpupillary distance has
not been adjusted.
The diopter adjustment has not
been performed.
The brightness is not appropriate.
51
Countermeasure
Adjust the brightness with the brightness
control knob on the power supply.
Open the diaphragm to a suitable size.
Adjust the condenser focus knob so that the
field diaphragm image is focused on the
specimen surface.
Adjust the diopters.
Perform parfocal adjustment.
Adjust the torque tighter.
Adjust the interpupillary distance.
Adjust the diopters.
Adjust the interpupillary distance.
Adjust the diopters.
Adjust the brightness with the brightness
control knob on the power supply.