Adjustment Procedures; Verify The Centering Of The System With The Image Quality Phantom - DENTSPLY ORTHORALIX 9200 Manual

ORTHORALIX 9200
Service Manual
6.

ADJUSTMENT PROCEDURES

6.1. VERIFY THE CENTERING OF THE SYSTEM
WITH THE IMAGE QUALITY PHANTOM
If the results obtained making a panoramic projection with the image
quality phantom are not in the tolerance (during the procedure to
test the system centering as explained in the Section C of this
Service Manual paragraph Testing the centering of the system), it
is necessary to change the start position of the movements following
the procedure below:
(1) simmetry not correct
the semi-projections "b" and "c" must be equal, with a tolerance of
± 2 mm (nominal value with the central vertical line well focused =
80 mm); if not, the start position of the X movement must be changed.
This is possible by entering the Service Programs and changing
the start position using the X movement test and adjustment program
(see paragraph 4.3.1. of this Section F of the Service Manual).
If the semi-projection on the right side (letter R on the film) is bigger
than the left side, introduce negative correction number by pressing
the key s- on the operator panel (max -99).
If the semi-projection on the right side (letter R on the film) is smaller
than the left side, introduce positive correction number by pressing
the key s+ on the operator panel (max +99).
Take note that in case of a big error in the simmetry, even the
central vertical line "a" could be not vertical with respect to the
horizontal line "d": by adjusting the start position of the X movement,
also this problem will be solved.
(2) dark area not centered
the dark area must be centered with respect to the central vertical
line "a" with a tolerance of ± 2 mm; if not, the start position of the R
movement must be changed.
This is possible by entering the Service Programs and changing
the start position using the R movement test and adjustment program
(see paragraph 4.3.3. of this Section F of the Service Manual).
If it is necessary to increase the right side of the dark area, introdu-
ce negative correction number by pressing the key s- on the
operator panel (max -99).
If it is necessary to increase the left side of the dark area, introdu-
ce positive correction number by pressing the key s+ on the
operator panel (max +99).
DENTSPLY Gendex
Take note that in case of a big error in the position of the dark area,
even the central vertical line "a" could be not vertical with respect
to the horizontal line "d": by adjusting the start positon of the R
movement, also this problem will be solved.
(3) layer in focus not in the right position (image too small
or image too wide)
the position of the layer in focus must be in the middle of the central
vertical line "a".
If not, the result is a too small or a too wide image (in the panoramic
the nominal value of the semi-projection is 80 mm) and this could be
corrected by changing the start position of the Y movement.
This is possible by entering the Service Programs and changing
the start position using the Y movement test and adjustment program
(see paragraph 4.3.2. of this Section F of the Service Manual).
If the image is too wide, introduce negative correction number by
pressing the key s- on the operator panel (max -99).
If the image is too small introduce positive correction number by
pressing the key s+ on the operator panel (max +99).
(4) horizontal line not flat
the line "d" must be horizontal and flat within a band of 6 mm.
If not, verify:
(a) that the phantom is correctly mounted on the chin rest
(b) that the chin rest is correctly inserted in the byte block
holder (and this means that the phantom is horizontal)
(c) that the byte block holder is not damaged (resulting in a
not horizontal phantom).
Take note that small undulation of the line "d" should be considered
as normal, due to the manufacturing way of the phantom itself.
(03.0)E
Section F
F-47