Villa Rotograph EVO, Руководство по обслуживанию

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SERVICE MANUAL
Troubleshooting
(Rev. 1) Rotograph EVO 8-57
8.4.2. Defects due to incorrect radiological data input and darkroom
Problem Description Solution
Under or overexposed
plate. The set kV values are not
suitable for the size of the
patient. Possible error
during development.
Check the development system or
repeat the examination changing the
kV values. See paragraph 6.4.4 of
the User Manual.
Completely black
plate. The film was exposed to light
or to involuntary radiation. Check that the darkroom is properly
closed and do not store new films
near X-ray sources.
Veiled plate. The edges of the films not
impressed by the dental
arch are not perfectly
transparent with consequent
faulty definition on the
entire film.
Check that the film has not expired
and that the film manufacturer's
storage indications have been
complied with. Check the working
non-actinic lamp in the darkroom.
Plate with stripes. The film has rubbed against
its box and accumulated
electrostatic charges or the
screens have not treated
with anti-static liquid.
Clean the screens with the anti-
static liquid.
Plate with blurred
details and good
contrast.
The screen is not correctly
pressed between the
screens.
Change the cassette.
Plate completely white. Was not exposed to X-rays
or the development process
was incorrect.
Check the passage of the X-rays via
acoustic and light signals (led 2 ). If
the error persists, check the
development procedure. Position the
fluorescent screen near the cassette
(option) and check the passage of
the X-rays.
The STF value is not correct. Refer to paragraph 6.9.3 of the
User's Manual to adjust the position
of the “STF”.
Soft Tissues not or
poorly visible in L-L
projection.
A symmetric cassette size
was selected. Select an asymmetrical cassette size
(which will enable the STF filter).