Gendex ORTHORALIX 9200 Service Manual page 82

F.3.29 Back up timer
The back-up time is counted by the microcontroller mounted on
The host board PC1 informs the microcontroller on the converter
board about the actual exposure time.
The microcontroller on the converter board sets itself to an ex-
posure time limit about 20 % longer.
When the DEAD_MAN line is on (exposure command by the op-
erator), the integration of the effective X-ray time is enabled, by
counting the time during which START_XRAY is on.
If the limit is exceeded, the microcontroller on the converter board
disables the converter electronics stopping the X-ray emission
and communicates the alarm to the host board.
The host board disactivates the START_XRAY line, resets the alarm,
and waits for the DEAD_MAN command to be released, before a
new exposure sequence is started.
Possible causes:
1.
2.
host board PC1 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).
If the host computer PC1 needs to be replaced, re-
member to remove the EEPROM D38 from the old
board and mount it on the new one, otherwise all
the following parameters will be lost:
If you forget to do this, recover the information from
the System Configuration Chart (see Section C).
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 (if expired).
Gendex Dental Systems 4519-190-71193-7
F-13
Printed on: 20 Apr 2012, 04:59:40 pm; Printed by: UWE.ZELLER
ORTHORALIX 9200 Service Manual
F.3.30 No Start/Stop HW
The microprocessor of the PC1 system control board is sending
the X-ray on start signals (one is a digital signal, the other one is
signals is the following:
1.
Dead man (positive - analog signal)
2.
on the serial communication channel are transferred in-
formation about set point of kV, mA and duration of the
exposure time
3.
X-ray start (negative - digital signal)
start/stop hw is generated.
Possible causes:
1.
PC1 system control board defect
2.
3.
or bad connection.
If the host computer PC1 needs to be replaced, re-
member to remove the EEPROM D38 from the old
board and mount it on the new one, otherwise all
the following parameters will be lost:
If you forget to do this, recover the information from
the System Configuration Chart (see Section C).
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 (if expired).
No
(03.0)E