Care Of Microscope; General; Mechanical Maintenance; Lamp Replacement - Leica DM E Mode D'emploi

4.11 Remove an eyepiece and view the back aperture of the
objective. Close the condenser aperture diaphragm and then, to
obtain the full resolving power of the microscope, reopen until the
diaphragm leaves just disappear from view.
Replace the eyepiece. The aperture diaphragm can be adjusted
to enhance contrast and/or increase the depth of focus.
4.12 When changing to higher power objectives, the positions of the
aperture diaphragm must be reset. As magnificaton increases, the
aperture diaphragm must be opened as required.
5.0 Care of the
Microscope

5.1 General

Keeping all optical components clean is important for maintaining
good optical performance. The microscope should always be cover-
ed with the plastic dust cover provided with the instrument when it is
not in use. If any optical surface becomes badly coated with dust or
dirt, it should be cleaned by blowing it off with a syringe or brushing
it off with a camel hair brush before attempting to wipe the surface
clean.
Optical surfaces should be cleaned with a lint-free cloth, lens tissue
or a cotton swab moistened with methanol or commercially available
glass cleaner. It is very important to avoid the excessive use of sol-
vent. The cloth lens tissue or cotton swab should be moistened with
solvent, but not be wet enough for the solvent to seep around the lens.
No part of the microscope is quite so vulnerable to dirt, dust and oil
as the front lens of the objective. Whenever lack of contrast, clou-
diness or poor definition is encountered, carefully check the conditi-
on of the front lens with a magnifier.
The lower magnification objectives have fairly large front lenses and
can be cleaned with a cloth or lens tissue wrapped around a finger
and moistened with methanol. The 40x and 100x objectives require a
little more care and examination with a magnifier.
To achieve the high degree of flatness obtained with the higher magni-
fication objectives, it is necessary to use a small concave front lens
of fairly short radius or curvature. The surface of this front lens can
be readily cleaned with a toothpick covered with a cotton tip, or with
a small cotton swab. Moisten the cotton with methanol and squeeze
it almost dry. Wipe the front lens lightly without applying undue force
or scrubbing action. Make sure that the cotton tip contacts the con-
cave lens surface. Check the objective with a magnifier after clea-
ning.
Should you need to remove the viewing body, be careful not to acci-
dentally touch the outer lens surface on the underside of the body.
Finger prints on this surface will reduce image clarity. This lens can
be cleaned in the same manner as objectives and eyepieces.

5.2 Mechanical Maintenance

Using the dust cover is the most important factor in keeping the micros-
cope in good mechanical and physical condition.
The Leica DM E has a durable finish. All non-optical parts of the instru-
ment can be cleaned with methanol, naptha or soap and water. Avoid
the use of all other organic solvents when cleaning the instrument.

5.3 Lamp Replacement

CAUTION: Unplug the instrument before attempting to change
the lamp.
CAUTION: The glass envelope of the lamp may be extremely
hot. Do not attempt to change the lamp before it is completely
cooled or without wearing adequate skin protection. The glass
should not be handled with
ched with bare hands clean the surface with a lens tissue and
methanol prior to installation.
The only component in the Leica DM E that may require periodic
replacement is the illuminator lamp.
12V, 20W Halogen replacement lamp . . . . . . . . . .# 13596025
12V, 35W Halogen replacement lamp . . . . . . . . . .# 13596030
A. Before replacement, unplug the instrument.
B. Open the lamp door by pulling locking pin
C. After it has cooled, carefully hold the lamp using a lens cloth and
remove it from its socket.
D. Place the new lamp into the socket using a lens cloth.
E. Close the lamp door, being sure to push the locking pin in until it
stops.
F. Never operate the microscope illuminator unless the lamp door is
securely closed.
5.4 Electrical Considerations / Equipment Ratings
CAUTION: Risk of electric shock. Removal of the bottom cover
of the microscope exposes hazardous voltages, which if contac-
ted, could cause injury or death. Please refer servicing to qua-
lified personnel.
bare hands. If the lamp is tou-
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