120 Series
Troubleshooting
20
Common Issues (Continued)
Symptom
Cause
Remedy
OPTICAL ISSUES
The color of the image is
not accurate
The brightness adjustment knob is not in the right position
Adjust the brightness knob to a higher or lower setting for color
clarity
No filter is used or filter is in use
Remove color filter if natural light is desired, or insert desired
filter
(Trinocular Only)
I cannot see anything in the
camera / Image is black
The trinocular port shutter of the microscope is not open
Slide the silver metal pin out on the head of the microscope
to allow light to reach the trinocular port
MECHANICAL ISSUES
The objective touches the
cover slip
The cover slip is not standard sized
Replace the cover slip with the appropriate 0.17mm thickness slip
The limit-stop is set too high or not engaged
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.
Unable to move the slide
smoothly
The slide is not secured correctly
Adjust the slide to use the stage clips and secure the sample
The mechanical stage is not properly secured
Tighten the mechanical stage screws to better secure the stage
Focus knob does not turn
The tension knob is too tight
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)
Stage declines by itself
The tension knob is too lose
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)
The coarse focusing knob
won’t raise the stage
Limit-stop is engaged
Disengage the limit stop (move up) on the read of the stage of the
microscope inside the coarse focusing knob
The fine focusing knob
won’t raise the stage
Limit-stop is engaged
Disengage the limit stop (move up) on the read of the stage of the
microscope inside the coarse focusing knob
ELECTRICAL ISSUES
The bulb/light source
flickers
The bulb is close to burning out
The unit’s LED bulb should not burn out. The bulb is not the
issue. Please contact customer service for warranty repair infor-
mation.
The microscope does not
light up
The microscope is unplugged
Insert the plug into the wall socket to achieve electrical illumina-
tion
The bulb burned out
The unit’s LED bulb should not burn out. The bulb is not the
issue. Please contact customer service for warranty repair infor-
mation.
The fuse burned out
Replace with fuse on the bottom of the microscope
The fuse burns out fre-
quently
The voltage is too high
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
The bulb burns out fre-
quently
The voltage is too high
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
