Gendex ORTHORALIX 9200 Service Manual page 81

ORTHORALIX 9200 Service Manual
F.3.25 I CHP out range
The current passing through the power transistors mounted on
to the microcontroller of the converter board itself.
When the current is outside the set operating range, the micro-
controller disables the converter electronics, and communicates
the alarm to the host board PC1; in consequence of that, the X-ray
emission is stop by disactivating the START_XRAY line. It waits for
a reset before starting a new exposure sequence.
If the current is really high, also the alarm Chp.over current may
be generated.
Possible causes:
1.
2.
tubehead defective.
If the converter board PQ1 needs to be replaced,
the service programs Tube calibration and Vf tube
editing must be performed (see the relevant para-
graphs of this section for more information).
The alarm is captured and stored as soon as it as it is detected.
Press the RESET pushbutton on the control panel to cancel the
alarm.
F.3.26 Over kV
The kV feedback from the tubehead is monitored by a comparator
the interrupt line of the microcontroller.
If the kV generated are more than 90, the microcontroller disables
the converter electronics and communicates the alarm to the host
board PC1; in consequence of that, the X-ray emission is stop by
disactivating the START_XRAY line. It waits for a reset before start-
ing a new exposure sequence.
The kV feedback signal can be monitored with a multimeter con-
Section D for more details).
Possible causes:
1.
2.
tubehead defective.
If the converter board PQ1 needs to be replaced,
the service programs Tube calibration and Vf tube
editing must be performed (see the relevant para-
graphs of this section for more information).
The alarm is captured and stored as soon as it as it is detected.
Press the RESET pushbutton on the control panel to cancel the
alarm.
Gendex Dental Systems 4519-190-71193-7
F-12
Printed on: 20 Apr 2012, 04:59:40 pm; Printed by: UWE.ZELLER
F.3.27 CHP. over current
The current passing through the power transistors mounted on
to the microcontroller of the converter board itself.
The relevant circuitry corrects the kV control loop and, in case of
excessive current, temporarily inhibits the converter electronics
and generates an alarm to the interrupt line of the microcon-
troller.
The microcontroller disables the converter electronics, and com-
municates the alarm to the host board PC1; in consequence of that,
the X-ray emission is stop by disactivating the START_XRAY line. It
waits for a reset before starting a new exposure sequence.
Possible cause:
1.
2.
tubehead defective.
If the converter board PQ1 needs to be replaced,
the service programs Tube calibration and Vf tube
editing must be performed (see the relevant para-
graphs of this section for more information).
The alarm is captured and stored as soon as it is detected.
Press the RESET pushbutton on the control panel to cancel the
alarm.
F.3.28 Converter: inv.over current
The current passing through the power transistors mounted on
to the microcontroller of the converter board itself.
When the absolute maximum current limit has been exceeded,
the converter electronics are immediately and permanently
inhibited (latched condition) and a system OFF/ON sequence is
required to cancel the alarm.
During the error condition, the alarm message is displayed on the
display and the control panel is disabled.
Possible causes:
1.
2.
tubehead defective.
If the converter board PQ1 needs to be replaced,
the service programs Tube calibration and Vf tube
editing must be performed (see the relevant para-
graphs of this section for more information).
To reset the alarm, switch the system OFF and then ON again.
(03.0)E