1Printer Information: Shows device information (such as the product model number, serial number, and firmware version number), the number of pages printed from the trays and duplexer, the ink level information, and the printhead health status.

NOTE: Ink level warnings and indicators provide estimates for planning purposes only. When you receive a low-ink warning message, consider having a replacement cartridge available to avoid possible printing delays. You do not need to replace cartridges until prompted to do so.

2Test Pattern 1: If the lines are not straight and connected, align the printheads. For more information, see To align the printheads.

3Test Pattern 2: If there are thin white lines across any of the colored blocks, clean the printheads. For more information, see To clean the printheads.

4Test Pattern 3: If there are dark lines or white gaps where the arrows are pointing, calibrate the linefeed. For more information, see To calibrate the linefeed.

To align the printheads

Whenever you replace a printhead, the device automatically aligns the printheads to ensure the best print quality. However, if the appearance of your printed pages indicates that the printheads are misaligned, you can start the alignment process manually.

NOTE: Before aligning the printheads, make sure you load plain paper. For more information, see Load media.

Control panel: Press (Setup), select Tools, select Align Printer, and then press OK. Press OK again when the alignment is done to continue.

Embedded Web server: Click the Settings tab, click Device Services in the left pane, select Align Printer from the drop-down list in the Print Quality section, and then click Run Diagnostic.

Toolbox (Windows): Click the Services tab, and then click Align Printheads and follow the onscreen instructions.

HP Printer Utility (Mac OS X): Click Align from the Information and Support panel.

To calibrate the linefeed

Control panel: PressSetup, select Tools, select Calibrate Linefeed, and then press OK.

Embedded Web server: Click the Settings tab, click Device Services in the left pane, select Calibrate Linefeed from the drop-down list in the Print Quality section, and then click Run Diagnostic.

Toolbox (Windows): Click the Services tab, and then click Calibrate Linefeed and follow the onscreen instructions.

HP Printer Utility (Mac OS X): Click Calibrate Linefeed from the Information and Support panel.

Maintain the printheads

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HP Pro 8500 - A909b, Pro 8500 - A909a, Pro 8500 - A909g manual To align the printheads, To calibrate the linefeed