Aec Calibration - DENTSPLY ORTHORALIX 9200 Manual

Section F
(23) Using the following formula, calculate the correction
parameter C:
C = 64 - (750 / SL)
Where SL is the parameter obtained in step (20).
Do not consider the decimal part of the parameter: i.e. 24.3
it must be considered 24. If the parameter is higher than 50,
it must be considered 50; if the parameter is lower than
-200 (i.e. -201, -202 etc.), it must be considered -200.
(24) Switch on the unit entering the Service Programs and select
AEC pan tune.
The following message will appear on the display:
AEC PAN TUNE
NEW=XX
where:
XX = is the actual correction parameter
ZZ = is the old correction parameter
The correction parameter that must be stored is the value C
calculated in the step (23).
To modify the correction parameter, use the Program +/
Program - keys on the keyboard (possible range from -200
to +50) and press DUMMY RUN key on the keyboard to
store the new parameter and to exit from the program.
(25) The panoramic AEC calibration is done.
(26) Remove the brass filter.
CASE (B): CEPH AEC CALIBRATION
(1) Mount the brass filter (code 4519 122 25571) on the ceph
cassette carriage so that it covers the AEC sensor of the
PA5 AEC control board; see the figure below.
(2) Check that no cassette is inserted in the ceph cassette
carriage.
(3) Switch on the unit entering the Service Programs, by
keeping pressed the PATIENT SIZE and the DUMMY RUN
keys of the operator panel while switching on the unit.
Keep pressed the two keys till the message WAIT
disappears from the display.
(4) The following message will appear on the display:
SERVICE PROGRAMS
Pls press Y- Y+
where Y- and Y+ are keys S16 and S17 on the keyboard
(used to move the rotating arm along the Y axis, to center
the patient with respect to the lateral vertical light).
F-66
OLD=ZZ
150mm
ORTHORALIX 9200
By pressing the above mentioned keys, select the service
program AEC Slope.
(5) The following message will appear on the display:
(6) Press the DUMMY RUN key on the keyboard; the following
message appears on the display:
60kV
(7) Rotate the tubehead in the ceph position and move the
collimator in the AP/PA position.
(8) Press the RESET key on the keyboard.
(9) Reduce the mA value from 9 to 3 using the mA- key on the
keyboard.
(10) Make an exposure, then the following will appear:
60kV
(11) Reduce the mA value from 15 to 6 using the mA- key on the
keyboard.
(12) Make an exposure, then the following will appear:
aXX
Write these parameters on a piece of paper.
(13) Switch off the unit.
(14) If one of the two parameters a and b is greater than 255,
repeat the steps from (3) to (12) reducing the value of the
mA of the second exposure till the parameters a and b are
lower than 255. Then, write the three parameters a, b and
sl on the label of the PA5 board.
(15) Switch on the unit entering the Service Programs and select
again AEC slope.
(16) Insert the ceph cassette (with the own intensifying screens
installed) in the ceph cassette carriage.
(17) Press the DUMMY RUN key on the keyboard; the following
message appears on the display.
60kV
(18) Press the RESET key on the keyboard.
(19) Make an exposure, then the following will appear:
60kV
(20) Make an exposure, then the following will appear:
aXX
Write these parameters on a piece of paper.
(21) Switch off the unit.
(22) If one of the two parameters a and b is greater than 255,
repeat the steps from (15) to (20) reducing the value of
the mA of the two exposures till the parameters a and b are
lower than 255.
(03.0)E
Service Manual
AEC SLOPE
DUMMY RUN TO GO
9mA 0.80s
15mA 0.80s
bXX SL=XX.X
9mA 0.80s
15mA 0.80s
bXX SL=XX.X
DENTSPLY Gendex