KERN OBL 145, User Instructions

Page: 24 / 28

23 OBL-14-15-BA-e-1610
9
Trouble shooting
Problem Possible causes
The bulb does not light
The mains plug is not correctly plugged in
There is no power at the socket
Defective bulb
Defective fuse
The bulb blows immediately The specified bulb or fuse has not been used
The field of view is dark
The aperture diaphragm and/or field
diaphragm are not opened wide enough
The selector switch for the beam path is set
to “Camera”
The condenser is not correctly centred
You cannot adjust the brightness
The brightness control has been set
incorrectly
The condenser has not been correctly
centred
The condenser is too low
The field of view is dark or is not
correctly
illuminated
The objective is not positioned correctly on
the beam path
The selector switch for the beam path is
between two settings
The nosepiece is not correctly fitted
The condenser is not correctly fitted
An objective is bei
ng used which doesn’t
match the lighting area of the condenser
The condenser has not been correctly
centred
The field diaphragm is closed too tightly
The bulb is not correctly fitted
The field of view of one eye does not
match that of the other eye
The interpupillary distance is not correctly
adjusted
Dioptre setting has not been carried out
correctly
Different eyepieces are used for the
righthand and lefthand side
The eyes are not used to using a microscope