Troubleshooting Guide; Optical System - Gima N-126 Handbuch

5. Troubleshooting Guide

5.1 Optical System

TROUBLE
1. The edge of the field of
view is dark or the bright-
ness is not uniform
2. Dirt or dust is visible in the
field of view
3. Visibility is poor
Image is not sharp;
Contrast is poor;
Details are indistinct
4. One side of image is
blurred
5. The brightness is not
enough
ENGLISH
CAUSE
The nosepiece is not in the locat-
ed position (objective and light
path not coaxial)
The surface of the lamp becomes
black
A lens (the objective, condenser,
eyepiece or collector) is dirty.
Dirt/dust on the specimen
Dirt/dust on the eyepieces
Specimen is not covered
The thickness of the cover glass is
not suitable
Specimen is placed reversely
Dry objective has oil on it. (espe-
cially for 40X objectives)
A lens (the objective, condenser,
eyepiece or collector) is dirty.
Immersion oil is not used with the
100x objective
Air bubbles existed in the immer-
sion oil
The aperture iris diaphragm is
stopped down too far
Dirt or dust on the eyepiece
Condenser is not properly cen-
tered
The nosepiece is not properly en-
gaged
The specimen is not clamped
The aperture iris diaphragm is too
small
The condenser is too low
A lens (the objective, condenser,
eyepiece or collector) is dirty.
SOLUTION
Locate the nosepiece properly
where it clicks
Change a new lamp bulb
Clean it thoroughly
Replace with a clean specimen
Clean them
Add cover glass on it
Use standard cover glass with
thickness of 0.17mm
Turn it over
Wipe the oil
Clean it
Use specified oil
Eliminate the bubble
Adjust the aperture iris dia-
phragm properly
Clean it
Center the condenser with the
centering screw
Engage the nosepiece properly
Clamp it with stage clips
Adjust it properly
Adjust it properly
Clean it
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