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2.
While the user lowers the platen cover, the Xenon Lamp is lit and the CCD array detects
the Fast-Scan (Y or Front-Back) dimension of the original. Simultaneously, the Slow-Scan
size sensors determine the left-right (or Y) dimension of the document original.
3.
The Xenon Lamp is shut off and the document original size is calculated. If the size is
unrecognizable, the user is prompted to enter its size manually.
4.
The user presses the Start key on the User Interface.
5.
The FRC moves to the White Reference Position and performs additional readings calcu-
lations necessary for White Reference Correction.
6.
For magnifications between 97.2% and 400%, the FRC doesn't move; it is already at the
appropriate Start Position. However, if the magnification is between 25% and 97.1%, the
FRC moves leftward to a different Start Position. This permits the carriages more distance
in which to accelerate.
7.
The Lamp is lit and the FRC scans at a rate determined by the magnification for a dis-
tance determined by the document original's Slow-Scan dimension. While scanning, the
document original is examined for color content.
8.
The Lamp is shut off and the FRC returns to the White Reference Position.
9.
If another scan is required, then either step 6 through 9 are repeated. Additional scans
may be delayed by image processing PWBAs until they are ready to receive scan data.
10. The next steps depends on how long the job has taken to run.
•
If the time interval since the last AGC/AOC/Shading readings is less than a threshold
value stored in the NVM, then the FRC moves rightward to the Home Position.
•
If the time interval since the last AGC/AOC/Shading reading exceeds the threshold,
then the Xenon Lamp is lit for 2 seconds, and the Post-initialization Operations and
Carriage Motions are repeated. At the end of these operations, the FRC goes to its
Home Position.
Document Scanning Carriage Motion (DADF Document Positioning)
The events described in this subsection apply only if the document original is placed on the
platen by the DADF. These events are as follows:
1.
The user places the originals in the DADF, and presses the Start key on the User Inter-
face.
2.
The DADF places the first document original on the platen. While moving the document,
the DADF determines the document's Slow-Scan (X or Left-Right) and Fast-Scan (Y or
Front-Back) dimensions.
3.
The Xenon Lamp is lit and the FRC moves to the Start Position associated with higher
magnification values. This is 15 mm to the left of True Reference Position.
4.
White Variation Correction is performed.
5.
For magnifications between 97.2% and 400%, the Full-Rate Carriage doesn't move; it is
already at the appropriate Start Position. However, if the magnification is between 25%
and 97.1%, the Full-Rate Carriage moves leftward 20 mm to a different Start Position.
This permits the carriages more distance in which to accelerate.
6.
The Full-Rate Carriage scans at a rate determined by the magnification for a distance
determined by the document original's Slow-Scan dimension. While scanning, the docu-
ment original is examined for color content.
7.
The Xenon Lamp is shut off.
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DocuColor 12/DCCS50
8.
The Full-Rate Carriage returns to the high magnification Start Position, 15 mm to the left
of the True Reference Position.
9.
The DADF removes the current document from the platen.
•
If there are no more documents in the DADF and the time interval since the most
recent AGC/AOC/Shading readings are less than a threshold value stored in the
NVM, the FRC moves to the Home Position.
•
If there are no more documents in the DADF, but the time interval since the most
recent AGC/AOC/Shading readings is greater than the threshold value, then the
Xenon Lamp is lit for 2 seconds, and the Post-initialization AGC/AOC/Shading Oper-
ations and Carriage Motions are repeated. At the end of these operations, the FRC
goes to its Home Position
•
If there are more documents in the DADF, then the DADF places the new document
on the platen. When a image processing PWBAs indicate that they are ready to
receive scan data, the Xenon Lamp is lit and White Variation Correction is per-
formed. Depending on the magnification rate, the FRC may remain stationary or
move to the low magnification Start Position. In either case, it then scans at the rate
dictated by the magnification rate.
Steps 7. through 9 are repeated until the DADF Input Tray is empty.
1/05
Image Sensing (Digital Copier & Copier/Printer
10-79
Principles of Operation
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