Nikon eclipse fn1 Instructions Manual page 52

Problem
The viewing is poor (too much
or too little contrast, or poor
resolution).
The focus is uneven.
The image is elongated.
The image is tinged yellow.
The image is too bright.
Chapter 5 Troubleshooting
1 Viewing Problems and Control Problems
Cause
The aperture diaphragm is
stopped down too far.
The condenser position is too low.
There is oil or water at the tip of
the dry type objective.
There is a bubble in the
immersion water at the tip of the
water immersion type objective.
The orientation adjustment of DIC
parts has not been performed.
Dirt or dust exists on the
objective, condenser, eyepieces,
filters, specimen, or optical path.
The nosepiece is not placed to a
click-stop position.
The specimen is not secured in
place on the stage surface.
The stage is tilting.
The nosepiece is not placed to a
click-stop position.
The specimen is not secured in
place on the stage surface.
The condenser has not been
centered.
The stage is tilting.
The NCB11-A filter is not used.
The lamp voltage is too low.
The lamp voltage is too high.
50
Countermeasure
Open the diaphragm to a suitable size.
Adjust the condenser focus knob so that the
field diaphragm image is focused on the
specimen surface.
Clean the components.
Raise the objective. And then, remove the
bubble from the water.
Adjust the polarizer orientation correctly.
Clean the components.
Push the slide click release button and slide the
sliding nosepiece to the click-stop position.
Attach the specimen securely.
Install the stage correctly.
Push the slide click release button and slide the
sliding nosepiece to the click-stop position.
Attach the specimen securely.
Center the condenser.
Install the stage correctly.
Place the NCB11-A filter into the optical path.
Adjust the brightness with the brightness
control knob on the power supply.
Adjust the brightness with the brightness
control knob on the power supply.