HP Designjet T790 HP Designjet T790 and T1300 ePrinter: User's Guide - English - Page 185
Scanning errors during alignment, Printhead status messages
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3. If the loaded paper is satisfactory, the printer runs the realignment and prints a realignment pattern. Ensure the window is closed, as a strong light source near the printer during printhead realignment can affect alignment. Ink system issues 4. The process takes about five minutes. Wait until the front-panel display shows the process complete before using the printer. Scanning errors during alignment If the alignment process fails, a Scanning problems message appears on the front panel. This means that the alignment has not completed successfully. Therefore the printer is not aligned and the alignment should be repeated before printing with good image quality. The problem may be due to: ● The paper used was not valid, repeat the alignment with valid paper ● Printhead health problems, clean printheads, see Clean the printheads on page 173 ● The alignment was done with the window open, repeat the alignment with the window closed If the problem persists after using valid paper, cleaning the printheads and keeping the window closed, there may be a failure in the scanning system needing repair; or the printheads, although clean, may not work and need to be replaced. Printhead status messages These are the possible printhead status messages: ● OK: the printhead is working normally, with no known problems ● Missing: there is no printhead present, or it is not correctly installed in the printer. ● Test printhead separately: you are recommended to test the printheads individually to find the failing printhead. Remove all the printheads and insert them alone one by one, closing the latch and the carriage cover after every insertion. The front-panel display indicates the failing one showing the reseat or replace message. ● Reseat: you are recommended to remove the printhead and then reinsert it. If that fails, clean the electrical connections, see The front-panel display recommends reseating or replacing a printhead on page 172. If that fails, replace the printhead with a new printhead, see Remove a printhead on page 118 and Insert a printhead on page 121. ● Replace: the printhead is failing. Replace the printhead with a working printhead, see Remove a printhead on page 118 and Insert a printhead on page 121. ENWW Printhead status messages 177