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120 Series
Common Issues (Continued)
Symptom
Cause
The color of the image is
The brightness adjustment knob is not in the right position
not accurate
No filter is used or filter is in use
(Trinocular Only)
The trinocular port shutter of the microscope is not open
I cannot see anything in the
camera / Image is black
The objective touches the
The cover slip is not standard sized
cover slip
The limit-stop is set too high or not engaged
Unable to move the slide
The slide is not secured correctly
smoothly
The mechanical stage is not properly secured
Focus knob does not turn
The tension knob is too tight
Stage declines by itself
The tension knob is too lose
The coarse focusing knob
Limit-stop is engaged
won't raise the stage
The fine focusing knob
Limit-stop is engaged
won't raise the stage
The bulb/light source
The bulb is close to burning out
flickers
The microscope does not
The microscope is unplugged
light up
The bulb burned out
The fuse burned out
The fuse burns out fre-
The voltage is too high
quently
The bulb burns out fre-
The voltage is too high
quently
Remedy
OPTICAL ISSUES
Adjust the brightness knob to a higher or lower setting for color
clarity
Remove color filter if natural light is desired, or insert desired
filter
Slide the silver metal pin out on the head of the microscope
to allow light to reach the trinocular port
MECHANICAL ISSUES
Replace the cover slip with the appropriate 0.17mm thickness slip
Be careful to avoid contact between objective and the slide when
the limit stop is up (unless using the 100x objective with oil). To
reengage, focus the sample, then lock the limit stop into place at
the stage height to set max height at a safe but usable distance.
Adjust the slide to use the stage clips and secure the sample
Tighten the mechanical stage screws to better secure the stage
Loosen it by adjusting the tension ring inside the coarse focus
knob counterclockwise (close to the arm of the microscope on
the left of the microscope)
Tighten it by adjusting the tension ring inside the coarse focus
knob clockwise (close to the arm of the microscope on the left
of the microscope)
Disengage the limit stop (move up) on the read of the stage of the
microscope inside the coarse focusing knob
Disengage the limit stop (move up) on the read of the stage of the
microscope inside the coarse focusing knob
ELECTRICAL ISSUES
The unit's LED bulb should not burn out. The bulb is not the
issue. Please contact customer service for warranty repair infor-
mation.
Insert the plug into the wall socket to achieve electrical illumina-
tion
The unit's LED bulb should not burn out. The bulb is not the
issue. Please contact customer service for warranty repair infor-
mation.
Replace with fuse on the bottom of the microscope
Use the correct power supply (110v if 110v unit, 220v if 220v
unit), or get a voltage adapter to convert to the proper electrical
system
Use the correct power supply (110v if 110v unit, 220v if 220v
unit), or get a voltage adapter to convert to the proper electrical
system
20
Troubleshooting