Midmark Preva - Troubleshooting and Maintenance; Troubleshooting Common Issues

System Configuration
Preva
68
Diagnostic Mode
About Diagnostic
Mode
The Preva Dental X-ray System has a diagnostic mode in which you can
display a summary of maintenance data or display feedback values after each
exposure.
Showing the
Maintenance
Summary
1. From the Main System Configuration menu, Figure 49, select
CONFIGURE UNIT. You will see the Configuration menu shown in Figure
52.
2. Select SET CONFIG. You will see the Set Configuration menu, shown in
Figure 53.
3. To display a summary of maintenance data, highlight select SHOW
MAINT. The following maintenance data are displayed:
 Total KJ (kilojoules—total system heat on the X-ray tube)
 Exposure Count
 Reboots (power up cycles)
 OT Counts (over-threshold counts)
4. Press any button on the Operator Panel to return to the Configuration
menu.
Showing
Feedback Values
After an
Exposure
If you take an X-ray while in diagnostic mode, the display shows feedback
values for that exposure. Until you exit diagnostic mode, the display will
continue to show feedback values after each exposure.
1. From the Main System Configuration menu, Figure 49, select
CONFIGURE UNIT. You will see the Configuration menu shown in Figure
52.
2. Select SET CONFIG. You will see the Set Configuration menu, shown in
Figure 53.
3. From the Set Configuration menu, use the up and down arrows to highlight
DIAG MODE ON. Press the right arrow button to turn on diagnostic mode.
4. Exit System Configuration mode by highlighting and selecting EXIT in the
Configuration and Main menus.
5. Make an exposure. The display will show the following feedback values:
 kV
 mA
 Filament current
6. Press any button on the Operator Panel to clear the feedback values from
the display.
7. To exit diagnostic mode, press the Tooth Selection and Patient Size
Selection buttons simultaneously for 5 seconds to display the Main System
Configuration menu. From the Main menu, highlight and select
CONFIGURE UNIT. Then highlight and select SET CONFIG. On the Set
Configuration menu, highlight and select DIAG MODE OFF.
Note: Feedback values are approximate.