Chapter 4
Troubleshooting
71
Chapter 4
T
roubleshooting
1.2
Epi-fluorescence Microscopy
Problem
Cause
Measure
Lack of visibility around
periphery of field of view.
Illumination is uneven
across the field of view.
Field of view is not
visible.
The filter cube is misaligned.
Push the cube in to the limit.
(
→
Chapter 3, “6 Assembly for Epi-fluorescence
Microscopy
―
■
Attaching a filter cube”)
The shutter is closed.
Open the shutter.
(
→
Chapter 2, “15 Tips for Epi-fluorescence
Microscopy
―
Protecting the specimen and
preventing it from decoloration (shutter for the
epi-fluorescence attachment”)
A fluorescent image is
not visible (when the
lamp is ON).
The selection of the filter cube is incorrect.
Use a correct filter cube.
(
→
Chapter 2, “15.2 Selecting Filters”)
ND filters of the epi-fluorescence
attachment are in the optical path.
Remove the ND filters from the optical path as
necessary.
(
→
Chapter 2, “15 Tips for Epi-fluorescence
Microscopy
―
Adjusting the brightness of the
fluorescent image (adjusting the ND)
―
■
ND filters
in the epi-fluorescence attachment”)
Light intensity is set to too low in the
setting of the ND on the HG precentered
fiber illuminator.
Adjust it.
(
→
Check your illuminator's manual.)
A halogen light source is used for a dark
specimen.
Change the light source to a mercury lamp.
(
→
Chapter
2, “15 Tips for Epi-fluorescence
Microscopy
―
Protecting the specimen and
preventing it from decoloration (shutter for the
epi-fluorescence attachment”)
Mercury lamp on the HG precentered fiber
illuminator has reached the end of its
product life.
Replace the lamp.
(
→
Check your illuminator's manual.)
A designated objective is not used at UV or
V excitation.
Use a designated objective.
The room is bright.
Make it darker.
The fluorescent image is
very dark (when the
lamp is ON).
The optical path switching lever is not set
to 100% light distribution for the binocular
section.
Switch the lever position to 100% light
distribution for the binocular section.
(
→
Chapter 2, “9 Switching the Optical Path of the
Tube”)
The dia-illumination lamp is on.
Turn off the dia-illumination lamp.
The fluorescent image
quality is poor.
The filter cube being used is not suitable
for the specimen.
Use a filter cube suitable for the specimen.
(
→
Chapter 2, “15.2 Selecting Filters”)
The objective or cover glass is dirty.
Clean it as appropriate.
(
→
Chapter 5 “2.1 Lense Cleaning”)
The immersion oil is fluorescent.
Use our designated non-fluorescent
immersion oil.
(
→
Chapter 2, “15 Tips for Epi-fluorescence
Microscopy”)
The slide is fluorescent.
Use a non-fluorescent slide.
(
→
Chapter 2, “15 Tips for Epi-fluorescence
Microscopy”)
The contrast of the
fluorescent image is
poor.
Stray light is entering from the condenser.
Lower the condenser, or remove the
condenser and attach a shielding tube.