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ORTHORALIX 9200
Service Manual
5.4.8. Tube voltage
The kV range is 60-84 kV, with steps of 2 kV.
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The high tension converter includes the following chain of
components: rectifier, filter, regulating chopper, inverter, high tension
transformer.
The chopper unit operates at high frequency with the PWM
principle, providing modulation of the DC supply to the inverter unit,
depending on the kV selected by the operator.
The high tension transformer is driven by the impressed current
inverter, operating at high freqeuncy with fixed duty factor.
The high voltage is monitored by means of a voltage divider built
into the high tension transformer, which provides direct feedback
to the control loop circuit of the converter.
For measurement and accuracy details please refer to section D.
5.4.9. Tube current
The mA range is 3-15 mA, with steps of 1 mA.
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The power to the filament is controlled by a separate impressed
voltage inverter, operating at high frequency with variable amplitude
and fixed duty factor.
The filament is continuously preheated when the equipment is
switched on, and additionally heated-up for 0.8 s before the
exposure is initiated.
For details about measurement and accuracies refer to section D.
5.4.10. "Dead man" function
The exposure handswitch operates in "dead man" function,
stopping exposure and movements as soon as the X-ray pushbutton
is released.
5.4.11. X-ray tube protection
A heat storage calculator continuously checks the thermal state of
the anode, inhibiting X-ray exposure when the maximum tube load
is exceeded. The maximum duty factor is 1:20, giving a maximum
wait time of 4 minutes.
DENTSPLY Gendex
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5.4.12.Anatomical Programs
Both for Pan and Ceph operation modes several sets of
pre-programmed exposure factors are available, selected by patient
size and projection mode keys, and by the film/screen speed
setting: please refer to the Operator's Manual for further
information.
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5.4.13.Exposure time
The exposure time is controlled by the microprocessor.
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For the applicable exposure times refer to the table below:
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For measurement and accuracy details please refer to section D.
5.4.14. Back-up timer
If the supply to the tubehead is not switched off by the main timer
after completion of the preset exposure time, a back-up timer will
terminate the X-rays.
The back-up timer operates after the selected exposure time plus
20%.
The back-up timer circuit is independent from the main timer circuit
and is on the converter board PQ1.
Whenever the back-up timer intervenes, a diagnostic message
"BACK UP TIMER" is displayed.
(03.0)E
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Section A
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A-9
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