Kodak DryView 8150, Service Manual, Page: 251 / 470

Section 6 -- Theory of Operation
6-49
2005 July Rev. B 7F3318
6-5-3. Power up, Calibration, and Print Sequence
Figure 6-27 illustrates the sequence of power-up initialization, diagnostics, calibration, and printing that
involves the AIQC components and GSM.
1. Initialize----At power up a series of self-tests is run on the OPTICS, DENSITOMETER, and RF TAG.
2. Perform optics calibration and diagnostics.
3. Read the RF TAG----When a CARTRIDGE is loaded and opened, the RF TAG on the bottom of the
CARTRIDGE is read. The TAG data includes emulsion, jumbo, band, film type (blue or clear), version
number and CARTRIDGE ID. The slave micro on the RF TAG BOARD passes the emulsion, jumbo,
band, and type information to the GSM. (This information is called the “sensi” data.)
4. Load the Film Model----After receiving the sensi data read from the RF TAG, GSM searches for the
appropriate Film Model. If it finds the Film Model, the Media LUT is created (go to step 7). If a Film
Model has not yet been created for this sensi data, or if the Film Model is older than 1 week (no
calibration for over a week), a calibration print is scheduled (step 5).
5. Create and Read a Calibration Print----The calibration print creates the Film Model and the resulting
Media LUT. A calibration print is requested in any of the following circumstances:
•
A CARTRIDGE is loaded with an emulsion number, jumbo, band, and type that are not defined in
the Film Model.
•
A calibration request is issued from the LOCAL PANEL.
•
The target Dpatch does not equal the Dpatch moving average (see step 9 below).
•
More than 1 week has elapsed since the last calibration print for the current CURRENT.
6. Create a New Film Model----The Film Model is built from the sensi data read from the RF TAG, the
time stamp (date of the last calibration), Dmin and Dmax values established in calibration, calculated
film speed, and Dpatch data.
7. Create a Media LUT and Set the ATTENUATOR----The data from the Film Model is used to create an
LUT that interpolates required laser diode intensity values into the pixel array passing through the
LUT. Then the Laser Attenuator is set to obtain the required densities on film.
8. Print the Film----The film is printed using the Media LUT and ATTENUATOR setting established by the
Film Model from calibration data.
9. Read the Dpatch when Film is Printed (if Dpatch is used)---- For each image printed, the density of the
Dpatch on the trailing edge of the film is measured. The density read is used to adjust the OPTICS
ATTENUATOR as follows:
•
If Target Dpatch = Dpatch Moving Average, no ATTENUATOR correction is required.
•
If Target Dpatch -- Dpatch Moving Average < or = 0.7, the ATTENUATOR must be adjusted.
•
If Target Dpatch -- Dpatch Moving Average > 1.3, a calibration print must be scheduled.
10. Build a new Film Model and Adjust the ATTENUATOR, if necessary----The ATTENUATOR setting is
adjusted to obtain corrected density readings on ensuing Dpatches.