Edge Sensor Calibration - HP C2858A Service Manual

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EDGE SENSE CALIBRATION
The edge sense calibration is used to calibrate the intensity of the line sensor in the carriage
PCA. A flag is cleared and set in the EEROM after the calibration and is used until recali-
brated. An improper calibration can result in edge detection failures during media loading.
The pen alignment procedure is also performed as a part of this calibration.
Perform the edge sense calibration whenever the:
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Edge Sense Calibration is accessible through the "Service Tests" menu. To perform the edge
sense calibration, do the following:
1. Press Enter at the "Status" display.
2. Use the arrow buttons to scroll to the "Utilities" main menu. Press Enter.
3. Simultaneously press the Enter and the Up Arrow buttons to access the "Service
Test" submenu.
4. Scroll to the "Edge Sense Calib" submenu. Press Enter.
5. Messages in the display will inform you to load media for the calibration to proceed.
Part of the calibration procedure is an automatic performance of the pen alignment
procedure. This process takes approximately four minutes to complete.
Adjustments/Calibrations
7-8
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edge detect failures occur during media loading
the carriage is replaced
the carriage LED sensor assembly is replaced
the EEROM is cleared or replaced
You must use paper when performing this calibration.
Note

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