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Section F
6.7. ADJUSTING TUBE CURRENT
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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 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).
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
where:
XX is the value referred to 4 mA: it could be changed by
pressing the kV+ / kV- keys on the operator panel
YY is the value referred to 9 mA: it could be changed by
pressing the mA+ / mA- keys on the operator panel
ZZ is the value referred to 14 mA: it could be changed by
pressing the s+ / s- keys on the operator panel.
(8)
set the first two numbers (XX - YY) -10 and set the last
number (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.
(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
(13)
make an exposure, then the following will appear:
70 kV
F-64
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YY
ZZ
4 mA
0.5 s
9 mA
0.5 s
(14)
make an exposure, then the following will appear:
(15)
at the end of the third exposure, the Vf Tube Editing
program is automatically entered, showing the tube
f o
h t
e
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 (7) to point (14) till the
values obtained at the end of the calibration are stable; for
example:
first calibration
second calibration
third calibration
the third calibration can be considered ok.
When the calibration is ok, decrease the values
by 10. For example:
good calibration
corrected values
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.
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(03.0)E
ORTHORALIX 9200
70 kV
14 mA
-15
-22
-12
-18
-11
-18
-11
-18
-21
-28
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DENTSPLY Gendex
Service Manual
0.5 s
-33
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