HP 750c Service Manual - Page 162
Mark Position, searches for the mark encoder.
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23. Mark Position The purpose of this test is to verify that the mark encoder is detected. Perform the mark position test as follows: 1 In the Service Tests submenu, scroll to 23 Mark Position" and press Enter. SERVICE TESTS 23 Mark position 2 The Remove Media / Press Enter" message is displayed on the frontĆpanel. Remove the media (if loaded) and press Enter to start the test. 3 The Looking for the Mark" message is displayed on the frontĆpanel while the plotter searches for the mark encoder. 4 If the test passes, the Mark Found / Press Enter" message is displayed on the frontĆpanel. 5 If the test fails, the Mark Not Found / Press Enter" message is displayed on the frontĆpanel. If the mark encoder fails the test, try one of the following: 1 Clean the mark encoder. 2 Perform the line sensor calibration ' page 7Ć5. 3 Perform the accuracy calibration ' page 7Ć6. 8-44 Troubleshooting C4705-90000