Image moves while
adjusting focus
Light is too dim
Objective lens collides with
the slide when switching
from a lower to a higher
power objective
Image won't come into
focus when using a
high-powered objective
Lamp does not turn on
Lamp flickers while on
Slide is shifting on the
stage
Disc diaphragm hole
selection is too small
Lamp setting is too low
Voltage is too low
Slide is upside down or too
thick
Stage is set too close to
the objectives
Safety rack stop needs
adjustment
Slide is upside down
No power source
Bulb has burned out
Bulb is not inserted into the
socket correctly
Power adapter is not fully
plugged in
Reposition slide more
securely in the clips
Rotate the disc diaphragm
to a larger hole
Increase intensity on the
control knob
Use the supplied power
adapter
Use a lab-quality slide or
flip the slide over so the
cover slip is facing up
Lower the stage with the
coarse focus knob
Adjust the safety rack stop
to stop the stage farther
from the objectives
Flip the slide over so the
cover slip is facing up
Check that the adapter is
fully connected or that
batteries are installed
Replace the bulb
Check to make sure the
bulb is fully screwed into
the socket
Check to make sure that
the adapter is fully
connected to wall socket
and to the microscope
6
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