Gendex ORTHORALIX 9200 Service Manual page 136

F.6.7 Adjusting tube current
After a replacement of the converter board PQ1
and of the tubehead, it is mandatory to perform
the mA calibration.
Proceed as follows:
1.
Switch on the unit and wait for 5 min.
2.
make three panoramic exposures (74 kV, 4 mA) respecting
the duty cycle.
3.
switch off the unit.
4.
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.
5.
The following message will appear on the display:
SERVICE PROGRAMS
Pls press Y- Y+
where:
to move the rotating arm along the Y axis, to center the
patient with respect to the lateral vertical light).
By pressing the above mentioned keys, select the Service
program Vf Tube editing.
6.
The following message will appear on the display:
VF TUBE EDITING
Press DUMMY RUN to go
7.
Press the DUMMY RUN key on the keyboard; three values
will appear on the display:
XX YY ZZ
where:
pressing the kV+ / kV- keys on the operator panel
pressing the mA+ / mA- keys on the operator panel
pressing the s+ / s- keys on the operator panel.
8.
set the first two numbers (XX - YY) -10 and set the last num-
ber (ZZ) to -20, by using the above mentioned keys on the
operator panel.
9.
press the DUMMY RUN key to store the new parameters and
to exit from Vf Tube editing service program.
Gendex Dental Systems 4519-190-71193-7
F-67
Printed on: 20 Apr 2012, 04:59:40 pm; Printed by: UWE.ZELLER
ORTHORALIX 9200 Service Manual
10.
enter the Tube calibration service program.
11.
The following message will appear on the display:
TUBE CALIBRATION
Press DUMMY RUN to go
12.
Press the DUMMY RUN key on the keyboard; the following
will appear on the display:
70 kV 4 mA 0.5 s
13.
make an exposure, then the following will appear:
70 kV 9 mA 0.5 s
14.
make an exposure, then the following will appear:
70 kV 14 mA 0.5 s
15.
at the end of the third exposure, the Vf Tube Editing pro-
gram is automatically entered, showing the tube calibration
parameters obtained at the end of the tube calibration; take
note that these parameters are already stored,and the old
ones are lost.
16.
record the values on a piece of paper.
17.
press the DUMMY RUN key on the keyboard to leave the Vf
Tube Editing service program.
18.
repeat the procedure from point (10) to point (17) till the
values obtained at the end of the calibration are stable; for
example:
first calibration -15
second calibration -12
third calibration -11
the third calibration can be considered ok.
When the calibration is ok, decrease the values by 10. For
example:
good calibration -11
corrected values -21
The values can be decreased using the Vf Tube Editing
service program.
19.
record the final values obtained in the System Configuration
Module.
20.
switch off the unit.
If during the first calibration the alarm kV out of range or
mA out of range is shown on the display, enter the Vf Tube
editing service program and set the values to -10 (ten) and
repeat the calibration.
If the alarm appears again, enter again the Vf Tube editing
service program and continue to reduce the values of a step
of -10 (ten) till the alarm disappears
-22 -33
-18 -27
-18 -26
-18 -26
-28 -36
(03.0)E