Kowa K9L48B, Service Manual, Page: 53 / 60

GG-09001 Edition 1.3
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５３
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Irregularity Check item Remedy
A white dot(s) appears at
the
same location(s)
within a picture.
The objective lens is fouled with dusts.
Clean the objective lens. Refer to “9.
Lens Cleaning”
The objective lens is fouled with tears.
Clean the objective lens. Refer to “9.
Lens Cleaning”
Patient’s eye is partly covered by
eyelashes. Keep the patient’s eyelashes from optically
blocking the pupil.
Peripheral area of a
picture becomes shaded.
Camera is positioned too far from the
patient’s eye.
Correctly align the fundus camera.
Peripheral area of a
picture
becomes
whitened.
Camera is positioned too close to the
patient’s eye.
Correctly align the fundus camera.
Locally darkened area(s)
appears on a picture.
Patient’s pupil is insufficiently dilated.
Switch to Small Pupil Mode when
Mydriatic Mode is selected. Check the
pupil
for diameter when using
Non-mydriatic Mode. If it is less than the
specified value, the center of picture
becomes darkened.
A black dot(s) appears at
the
same location(s)
within a picture.
Inside of the camera is fouled with dusts.
Remove dusts and soils off from the lens.
Refer to “9. Lens Cleaning”
Center spot is noticeable.
Check that the center of the image is not
dark.
The patient’s pupil is too small to take a
clear image.
Small pupil causes dark images and
noticeable center spot.
Check that the objective lens is not dirt.
The dirty objective lens causes noticeable
center spot.
Clean the objective lens.
Center spot is too
noticeable.
The trouble still was not solved, after
confirming all of the above.
Check that the center spot is much
brighter than fundus image. Failure of the optical adjustment, inside of
the optical head unit, is suspected.
Adjust the optical system, according to
“13-3.Adjustment of the black point glass.”