KERN OSF 522, User Instructions

Page: 22 / 23

21 OSF-5-BA-e-1510
8
Trouble shooting
Electrical system
Problem Possible causes
The lighting unit (if fitted) cannot be
switched on The power cable is either not connected or
not connected correctly
The bulb is not fitted
The bulb has blown
The fuse has blown
The brightness control is set to the lowest
level
The bulb has blown The wrong bulb has been used
The input voltage was too high
The bulb flickers The bulb is not correctly fitted
The lamp is worn out
The bulb brightness is not sufficient The wrong bulb has been used
The input voltage is too low
Optical unit
Problem Possible causes
You can see two images The interpupillary distance is not set
correctly
The magnifications of the eyepieces do not
match
There is dirt in the visual field There is dirt on the object being observed
There is dirt on the eyepiece surface
The image is unclear There is dirt on the objective surface
The focus wheels are jammed The torque of the focus wheels is set too
high
The microscope head slips down
while you are viewing the object The torque of the focus wheels is set too low
Eyes get tired easily The dioptre adjustment is not correct
The brightness adjustment is not correct
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