OPERATIONAL TEST PROCEDURE (WITH CHEMISTRY)
1.
Using safelight conditions, with the processor at normal operating temperature (low
temperature light not flashing) and 4 1/2 minute speed, process an unex-
posed film. It
should emerge
clear
and dry.
2.
Process a light-exposed film. It should emerge
black
and dry.
3.
If the results are as descirbed, the chemistry, film and processor are performing prop-
erly and the machine is ready to use.
PRECAUTIONARY NOTE
Both automatic and manual processing are based on established time/temperature relationships.
In the DENT-X 9000 and 810 Basic, time and temperature are automatically controlled to provide
optimal image quality for correctly exposed films. Films that have been overexposed or underex-
posed may result in loss of diagnostic information and subject the patient and office personnel to
unnecessary radiation. To obtain desired film densities, exposures should be increased or
decreased in steps of 25-33% from a test exposure and film.
THEORY OF OPERATION (9000)
A. Initial Start-Up Cycle
Upon machine turn-on, the pumps run at full power for 6-9 seconds, adding about 3-4 ounces
(90 - 120 ml) of fresh chemistry to each processing tray. All machine functions activate and the
machine goes through one processing cycle in the 4 1/2 minute mode. The duration of this cycle
is seven (7) minutes.
27
4.
Feeding the Film: There are four Entry Guides for intraoral film. With the 9000 proces-
sor, feeding film into any one of these slots will activate the processing mode (Figure
23). With the 810 Basic, the "RUN" button must be pressed first to activate the system
(Figure 24). Insert all extraoral films lengthwise. Allow 15 seconds between these
large films to prevent overlapping. In the 9000, the "FILM PRESENT" light
turns off
when this 15 second period has elapsed.
NOTE:
With the 810 Basic it is recommended to activate the process mode with the
"RUN" switch for approximately 5 minutes before inserting film. This insures complete
mixing of chemicals and wets the transport rollers to help prevent artifacts from
crystals
or residues that may have accumulated overnight.
5.
The 9000 will revert to standby mode approximately 2 1/2 minutes after the last film
exits (at the 4 1/2 minute speed). With the 810 Basic, the Run button must be
pressed
after the last film exits the machine to put the machine back into standby
mode.
6.
Turn the Main Power Switch OFF and close the water supply valve at the end of the
day.
Figure 23: Guides for Intraoral Film
Figure 24: Pressing RUN
Button
