Gendex ORTHORALIX 9200 Service Manual page 139

ORTHORALIX 9200 Service Manual
6.
Press the DUMMY RUN key on the keyboard; the following
message appears on the display:
60kV 9mA
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 15mA
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 bXX
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 9mA
18.
Press the RESET key on the keyboard.
19.
Make an exposure, then the following will appear:
60kV 15mA
Gendex Dental Systems 4519-190-71193-7
0.80s
0.80s
SL=XX.X
0.80s
0.80s
F-70
Printed on: 20 Apr 2012, 04:59:40 pm; Printed by: UWE.ZELLER
20.
Make an exposure, then the following will appear:
aXX bXX
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.
23.
Using the following formula, calculate the correction param-
eter C:
C = 64 - (820 / 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 ceph tune.
The following message will appear on the display:
AEC CEPH TUNE
NEW=XX
where:
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 ceph AEC calibration is done.
26.
Remove the brass filter.
SL=XX.X
OLD=ZZ
(03.0)E