Tuesday 21 September 2021

Corix PRO 70 DIGITAL Detal Xray machine fault codes

 

CORIX PRO 70 - WM (WALL MOUNT)

When turning on the equipment, the display will show the screen presented in Fig. 1. This screen shows the Equipment Model and the software version. At this point, the equipment will execute a “self testing procedure” in order to early
detect some kind of mal-functioning. This testing will take a few seconds.
Next, the display will show the screen presented in Fig. 2. At this point, if the “F1” key is depressed within 5 seconds, the “Menu” routine will be accessed. If not, the “Main” screen will be accessed.

When the “Main” screen is accessed, the display will show the screen presented in Fig. 3.
Once the “Main” screen is accessed, it is possible to set pre-programmed times for automatic exposures or set the timer in manual mode. Of course, it is possible at any time to switch between automatic and manual time exposures.



ERROR AND FUNTIONAL MESSAGES
The Control Panel is provided with a self diagnostic function which constantly monitors the system and its most important safety circuits. When a problem occurs, the system will show a message on the display to alert the user of this
situation.  The control unit is constantly monitoring the Main Line Voltage. If the line voltage is lower than 10% of the nominal line voltage, the display will show the message presented in the Fig.21. If the line voltage is higher than 10% of the nominal line voltage, the display will show the message presented in Fig. 22.  Once the line voltage returns to its operating range, the control unit automatically resumes its operation and the display will show the screen presented.


CHECKS AND CORRECTION OF POSSIBLE FAULTS IN DENTAL RADIOGRAPHS


LOGIC BOARD ADJUSTMENTS AND SETTINGS

Nominal Operating Line Voltage Setting
This setting is controlled by the Dip Switch “SWI” (see Fig. 2) according to the next table.  The Dip Switch is preset in the Factory and must never be changed by the user.
b) Internal Voltmeter Calibration
This adjustment is controlled by the Trimmer “POT1” (see Fig. 2) It is preset in the Factory and must never be changed by the user.
c) LCD Display Contrast Adjustment.
This adjustment is controlled by the Trimmer “POT2” (see Fig. 2) It is preset in the Factory and if necessary, it may be changed by the user.



PRE-SET EXPOSURE TIMES
The following tables of pre-set exposure times in seconds show the rated exposure time for a nominal line voltage of 120Vac (230Vac) and the final corrected exposure time, as a function of the line voltage correction factor, patient size and type of Film (D, F or Digital Sensor) for the minimum 108Vac (207Vac) and maximum 132Vac (253Vac) line voltage operating range.


PRACTICAL PROCEDURES FOR MEASURING TECHNICAL FACTORS
KVp
is defined as the high voltage value applied to the X-Ray tube after preheating time. KVp value should be measured by a non invasive instrument with an accuracy of over 2% to the nominal value.
The anodic current value (mA) is defined as the average value of a steady state current through the X-Ray tube after pre-heating time.
The anodic current value should be measured using a digital voltmeter. To do this, it is necessary to remove the Tube head plastic covers. This operation must be performed only by a qualified technician. To take this measurement, the digital voltmeter should be selected on DC and read the voltage drop at the ends of a 1KΩ, 1%, assembled on the Tube head. The relation of transformation is given by 1mA = 1V. Execute an exposure of at least 1s.
The time interval measured from the moment where the anodic peak current first exceeds 25% of the steady state to the moment it again reaches 25% when decreases is called the exposure time (t).
When taking a measurement of this time, nominal line voltage should be selected, and a digital memory oscilloscope should be used to read the voltage drop across the 1KΩ resistor. The “pre-heating time” is the time taken for the anodic current to reach 25% of its steady state value.

MEASURING EXPOSURE TIMES
The use of non-invasive equipment, when measuring functional parameters of XRay devices like exposure time, has led to introduce some interpretation issues.
The root of these issues is due to the anodic current wave form which is represented in the next figure:  IEC 60601-2-7 (1998) regulations reads: “in equipment where the filament is switched on and high voltage is applied simultaneously, the exposure time is calculated as the interval between the instant when the anodic current exceeds 25% of the nominal value and the instant when it goes below such value”. The last figure shows the anodic current wave form for an exposure of 0.2s with a pre-heating time of 0.23s. It can be seen that the time named “Delta” measured in the interval when the anodic current exceeds 25%, represents the actual exposure time (204.0ms).
Although, non-invasive methods can be simpler to perform than the invasive methods, they may lead to errors which can be considerable when determining exposure time. Calculations of exposure time obtained by using non-invasive
methods may lead to the conclusion that the unit timer is not accurate enough to meet the regulations.

Electrical Features
The supply line must meet the requirements specified on Label # 2, located on the Control Panel:
- 120 VAC +/- 10% – 10 Amp., 50/60 Hz, single-phase mains voltage + ground,
or:
- 230 VAC +/- 10% - 6 Amp., 50/60 Hz, single-phase mains voltage + ground.
The equipment must be wired to an electrical panel whose characteristics comply with the electrical regulations in the country where it is installed. A dedicated line protected by a 10A circuit breaker is recommended.