Levenhuk 3ST [4/23] Care and maintenance

Preparations

Place a specimen in the center of a blank slide, put the slide on the stage and lock it in place

with stage clips.

Eyecups

For additional comfort during observations you can use rubber eyecups on both eyepieces.

Focusing, diopter adjustment, interpupillary distance

Place a slide on the stage and lock it in place with stage clips. Loosen the locking knob on the

microscope pole and slide the head up or down into a desired position and retighten the locking

knob. Look through the right eyepiece and turn the objective lens handle until you see the

specimen in your field of view. Afterwards, turn the focus knob until the image is sharp and clear.

Look through the left eyepiece and rotate the diopter adjustment ring until the image is sharp

and clear. Do not adjust focus during diopter adjustment! Upon completing this process, look

through both eyepieces, hold them with your hands and bring them closer or move them apart

until a double image turns into a single image.

Changing objective lenses

Levenhuk 3ST has a revolving nosepiece with two objective lenses. To switch between them you

have to rotate the nosepiece.

Changing lamps and fuses

CAUTION: Before changing a lamp or a fuse make sure the microscope is unplugged from a power

source. Also, wait until the lamp cools down.

Changing the upper illumination lamp

Loosen the locking screw on the upper illumination housing and remove the light socket from

within. Replace the old lamp with a new one and put the light socket back. Retighten the locking

screw.

Changing the lower illumination lamp

Loosen the locking screw on the stage and remove the glass. Remove the old lamp from the light

socket and replace it with a new one. Put the glass back in its place and retighten the locking

screw.

Changing the fuse

Fuse box is located on the bottom of the microscope base. Remove the cover and replace the old

fuse with a new one.

Care and maintenance

Never, under any circumstances, look directly at the Sun, another bright source of light or at a

laser through this device, as this may cause PERMANENT RETINAL DAMAGE and may lead to

BLINDNESS.

Take necessary precautions when using the device with children or others who have not read or who do

not fully understand these instructions.

After unpacking your microscope and before using it for the first time check for integrity and

durability of every component and connection.

Do not try to disassemble the device on your own for any reason. For repairs and cleaning of any kind,

please contact your local specialized service center.

Protect the device from sudden impact and excessive mechanical force. Do not apply excessive

pressure when adjusting focus. Do not overtighten the locking screws.