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6
Optical
Electrical
Problem
Possible Cause
High magnification objectives strike the specimen when
changing over from low to high magnification
Insufficient parfocality of objectives
Eye strain or fatigue
Slide is upside down
Cover glass is too thick
Eyepiece diopter not adjusted
Interpupillary distance not adjusted
Diopter adjustment not made
Field of view of left and right eyepiece differ
Inadequate illumination
Lamp does not light
Inadequate brightness
Lamp blows out immediately
Lamp flickers
Power supply not plugged in
Lamp not installed
Lamp burnt out
Specified lamp not being used
Specified Lamp not being used
Connectors are not securely connected
Lamp near end of service life
Lamp not securely plugged into socket
Lightbulb Replacement:
Make sure microscope is not plugged in!
Remove screws from base plate (3) to access bulb. Disconnect bulb wire (2) from
microscope connection (1). Insert new bulb and reconnect wires. Replace base
plate and screws.