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Leica DM750 Manual 49
Troubleshooting
Stand
The microscope does not respond.
Make sure that the socket has voltage.
Check the cable connections.
Make sure that the stand is connected to the power supply.
Check whether the fuse is defective and replace it if necessary (see page 16).
Focus
The specimen cannot be brought into focus.
Use the correct immersion medium.
Lay the specimen with the cover glass toward the top.
Make sure that the cover slip thickness is correct and that it meets the specifica-
tions on the objective.
Dark field
No definite DF contrast is possible.
Make sure that a DF objective is being used.
The objective aperture is too high (maximum 0.75/ 1.10); if necessary, reduce
the objective aperture through the iris diaphragm on the objective.
Check the condenser centering.
Open the aperture diaphragm completely.
The image is not uniformly illuminated. The objective magnification is too weak. Use a higher magnification.
Unwanted stray light. Clean the specimen and neighboring lens surfaces.
Polarization