Chapter 6 Troubleshooting; Optical - Nikon ECLIPSE 50i Instructions Manual

6
Troubleshooting
If the product does not function properly, take appropriate action as described below. If the
problem is still not resolved after referring to "Troubleshooting," please contact your nearest Nikon
representative

Optical

6.1
Problem
Field of view vignetts.
Illumination is uneven
across the field of view.
Field of view is not
visible.
Dirt or dust is present in
the field of view.
Image quality is poor.
Contrast is poor.
Resolution is poor.
Focus is uneven.
Image flows.
Image is tinged yellow.
Field of view is too
bright.
Possible causes
Parts are attached incorrectly.
Movable parts are not switched
correctly.
Field diaphragm image is not focused
on the specimen surface.
Field diaphragm is stopped down too
far.
Dirt or dust is present on the lens or
container.
Dirt or dust is present on the lens or
container.
Field diaphragm image is not focused
on the specimen surface.
Dirt or dust is present on the lens or
container.
Objective correction ring does not
match the thickness of the
container's bottom plate.
Field diaphragm image is not focused
on the specimen surface.
Revolving nosepiece is not attached
correctly, or has not been fully
rotated to the click stop position.
Specimen is tilted relative to the
stage surface.
Revolving nosepiece is not attached
correctly, or has not been fully
rotated to the click stop position.
Lamp voltage is too low (for the 50i).
There is no ND filter in the optical
path.
Lamp voltage is too high (for the 50i).
74
Remedy
Confirm that parts (nosepiece, condenser,
etc.) are correctly attached.
Move parts (e.g., optical path switching
lever, nosepiece, filter cube switching
knob) until a click is felt.
Focus and center the condenser.
Open the field diaphragm slightly wider
than the field of view.
Clean off the dirt, and use a clean
container.
Clean off the dirt, and use a clean
container.
Focus and center the condenser.
Clean off the dirt, and use a clean
container.
Adjust the correction ring.
Focus and center the condenser.
Attach it correctly and rotate to the click
stop position.
Correctly reposition the specimen on the
stage.
Attach it correctly and rotate to the click
stop position.
Increase the voltage with the brightness
control knob.
Place ND filters in the optical path.
Reduce the voltage with the brightness
control knob.