System Configuration
Preva
65
Changing Pre-programmed Exposure Settings
The Preva Dental X-ray System allows the operator to increase or decrease
image density for all presets for a receptor simultaneously or to change each
of the technique factors for a preset individually. You can also restore factory
default settings. For charts of the factory default settings, refer to Factory
Default Exposure Settings on page 18 in the Preva User manual.
Note: If the 12” [30 cm] cone is going to be used, configure the Preva for
use with the 12” cone before changing preprogrammed exposure
settings. Configuring the Preva for use with the 12” cone will reset
exposure settings to the default settings used with the 12” cone.
Displaying the
Change Presets
Menu
1. From the Main System Configuration menu, Figure 49, select CHANGE
PRESETS. You will see the Preset Options menu shown in Figure 51.
2. Selecting EXIT returns the display to the Main System Configuration
menu.
Changing All
Receptor Settings
Globally
1. Select ALTER DENSITIES from the Preset Options menu. The first Image
Receptor Type illuminates. The display shows the selected Image
Receptor Type and current density.
2. Using the Image Receptor Type button, select the image receptor to
adjust.
3. Use the up and down arrow buttons to specify a percentage by which
densities will be increased or decreased for the selected receptor.
Densities can be increased in steps of 25% and decreased in steps of
20%.
4. Press the right arrow to save your settings.
Preprogramming
to Digital Sensors
1. Energize the system.
2. Press the Tooth Selection and Patient Size Selection buttons for five full
seconds.
3. Select CHANGE PRESETS from the Menu Options screen.
4. Select SELECT RECEPTOR from the Preset Options menu.
5. Press the up or down button to highlight the sensor or phosphor plate to
change, and press Enter.
6. Select YES or NO on the Verification screen.
7. Exit the Preset Options menu.
Changing Presets
Individually
1. Select EDIT PRESETS from the Preset Options menu. The display notifies
you that you are entering Edit Preset Mode, and Tooth Size, Image
Receptor Type and Patient Size are illuminated.
2. Use the Tooth Selection, Image Receptor Type and Patient Size Selection
buttons to select the preset to change. The display shows the current
values for the preset.
3. Use the right arrow button to display the technique factor to change.
4. Use the up and down arrow buttons to set the value for the selected
technique factor and preset.
5. Repeat steps 2-4 to change additional presets.
6. When you have completed all changes, press the Tooth Selection and
Patient Size Selection buttons simultaneously for 5 seconds to record the
change.
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