VWR International, LLC., Standard Biological Microscope
3.3 Modification of biological microscope
Unplug the biological microscope before making any modifications.
3.3.1 Replace the head
Unscrew the head lock screw and lift out the existing body tube.
Insert the new body tube vertically into pilot hole of the main unit, resting it on the shoulder.
Tighten the head lock screw.
3.3.2 Replace the objective
Lower the stage completely with the coarse focus knob.
Rotate the nosepiece to move the objective to be replaced to the side.
Unscrew the objective and remove it downward.
Fix the new objective into the hole on the nosepiece. Be very careful to match the threads correctly,
the objective should screw in smoothly and easily. Make sure the objective is screwed in tightly.
If one of the nosepiece holes is not used for an objective a dustproof cap should be screwed into the
vacancy to prevent dust from entering.
4. MAINTENANCE & TROUBLESHOOTING
4.1 Maintenance
The biological microscope is limited to the following maintenance only:
Turn off the power switch after use, and put on the dustproof cover after the microscope has cooled
down.
Do not operate the microscope in a room with humidity higher than 75%.
Remove dust or ordinary dirt on optical lens surfaces with a brush, rubber suction bulb and a
moistened lens tissue.
Use only optical lens tissues and optical lens cleaner (see below). Never clean a lens with a dry
optical lens tissue. Be sure to remove any dust before using lens tissue and cleaner.
To remove stubborn oily or lipoid dirt (such as immersion oil or fingerprints), dip the lens tissue into
a 3 to 7 ethanol-ether mixture or a commercially available optical lens cleaning solution and then
use it to wipe off the dirt.
When cleaning an optical lens surface, wipe gently in a circle from the center to the edge.
