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HP 2-pen Graphic Plotter - How to Print a Demo Plot

Issue:
How to run the confidence test (demo plot) on the HP 2-pen Graphic plotter.
Solution
The confidence test is initiated by holding the PEN UP push-button down while turning on the plotter. The PEN UP push button may be released after the pen holder starts to move. It will begin to draw an asterisk at one corner. The confidence test will repeat approximately every 55 seconds and can be stopped only by turning off the plotter. If left, the process will continue until 80 asterisks are drawn in the first row advancing P1 one row with each asterisk. Hold down the UP ARROW to decrease time between asterisks.
Summary
The confidence test checks the mechanical and electronic functions of the plotter by selecting alternate pens, moving between scaling points P1 and P2, drawing an asterisk with pen 2, and moving 79 spaces along the X-axis. Pen 2 is then stored and the pen holder returns to P1, indicating the confidence test is completed. If the asterisk is not drawn, the plotter is malfunctioning.

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