Page 17
One side of the image is out of focus.
The nosepiece is not in the
center of the light path
Turn the nosepiece to a click stop
The specimen is out of place
(tilted)
Place the specimen flat on the stage.
The optical performance of the
sample cover glass is poor
Use a cover glass of better quality
II. Mechanical Section:
The coarse focus knob is hard to
turn.
The tension adjustment collar is
too tight
Loosen the tension adjustment collar
The focus is unstable.
The tension adjustment collar is
too loose
Tighten the tension adjustment collar
III. Electric section
The LED doesn’t turn on.
No power supply
Check the power cord connection
The brightness is not enough
The brightness adjustment is
low
Adjust the brightness
The light blinks
The power cord is poorly con
-
nected
Check the power cord
IV. Viewing tube assembly
The field of view of the two eyes is
different
The interpupillar distance is not
correct
Adjust the interpupillar distance
The dioptric correction is not
right
Adjust the dioptric correction
The viewing technique is not
correct, and the operator is
straining the eyesight
When look into the objective, do not stare
at the specimen but look at the whole field
of view. Periodically, move the eyes away
to look at a distant object, then back into
the objective
V. Microphotography and video
The image is unfocused
Incorrect focussing
Adjusting the focus system as in the pres
-
ent manual
The edge of the image is unfocussed
To some degree, it is inherent
to the nature of achromatic
objectives
The problem can be minimized by a correct
setting of the aperture diaphragm
Bright patches appear on the image
Stray light is entering the
microscope through the eye
-
pieces and through the camera
viewfinder
Cover the eyepieces and the viewfinder
with a dark cloth
