15
6. 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:
1.The coarse focus knob is hard
to turn.
The tension adjustment col-
lar is too tight
Loosen the tension adjustment collar
2.The focus is unstable.
The tension adjustment col-
lar is too loose
Tighten the tension adjustment collar
III. Electric section
1. The LED doesn’t turn on.
No power supply
Check the power cord connection
2. The brightness is not enough
The brightness adjustment
is low
Adjust the brightness
3. The light blinks
The power cord is poorly
connected
Check the power cord
IV. Viewing tube assembly
3. 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 ob-
ject, then back into the objective
V. Microphotography and video
1. The image is unfocused
Incorrect focussing
Adjusting the focus system as in the
present manual
2. The edge of the image is
unfocussed
To some degree, it is inher-
ent to the nature of achro-
matic objectives
The problem can be minimized by a
correct setting of the aperture dia-
phragm
3. Bright patches appear on the
image
Stray light is entering the
microscope through the
eyepieces and through the
camera viewfinder
Cover the eyepieces and the viewfind
-
er with a dark cloth
Summary of Contents for VisiScope 400 Series
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