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AUTOMATIC REFERENCE DOCUMENT CALIBRATION

IP.com Disclosure Number: IPCOM000027018D
Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 123K

Publishing Venue

Xerox Disclosure Journal

Abstract

In order to assure the proper operation of an Auto Background Suppression (ABS) feature, it may be necessary to obtain the correct background reading for white paper in three modes of operation (Open Platen,Top Document Feeder and Side Document Feeder). This background reading becomes the reference level to compare to all other background readings. To perform this operation manually would require much time and effort, with the possibility of making errors and thus hindering the performance of the function.

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XEROX DISCLOSURE JOURNAL

AUTOMATIC REFERENCE DOCUMENT CALIBRATION Roger W. Budnik

Proposed Classification
U.S. C1.355/208 Int. C1. G03g 21/00

In order to assure the proper operation of an Auto Background Suppression (ABS) feature, it may be necessary to obtain the correct background reading for white paper in three modes of operation (Open Platen,Top Document Feeder and Side Document Feeder). This background reading becomes the reference level to compare to all other background readings. To perform this operation manually would require much time and effort, with the possibility of making errors and thus hindering the performance of the function.

A routine has been devised that fully automates the sampling and recording of the white paper reference values mentioned above. The key feature of this diagnostic routine is that there is very little user interaction necessary. The routine will automatically respond to the input mode chosen by the operator. The routine operates as follows:
After entering diagnostics and entering a given code, the system will wait to respond to the input mode chosen by the operator.

In the Open Platen mode, when white paper is placed on the platen, the open platen sampling routine is invoked. The white paper is scanned, background readings are sorted and the highest reading is obtained (reference value). The ABS sampling code then passes information to the diagnostic code. This information consists of the reference value and a byte to indicate which mode was implemented. The diagnostic code now displays the reference value on the User Interface along with its corresponding non volatile memory (NVM) value and stores this value in NVM. A message indicating that Open Platen mode calibration was performed is displayed on the screen.

If the operator places a sheet of white paper in the Top Document Feeder, (TDF), the ABS TDF sampling routine will respond as soon as the startiprint button is pressed. Sampling begins approximately 100 m...