HP Photosmart 7520 Error Troubleshooting

TECH TIP: How an Inkjet Printhead Works -- 4, 5 & 6 Ink Cartridge Printers: https://www.youtube.com/watch?v=XgcjgkNBLB0 TECH TIP 2: Hot Water Printhead Flush - HP Series: https://www.youtube.com/watch?v=KH3p2uFalxg --- For HP Photosmart 7520 ink cartridge errors such as “Ink Cartridge Problem”, "Missing or damaged", "The following cartridges are not intended for use in this Printer" then the printer is not recognizing the cartridge's ‘smart chip’ which is affixed to the rear side of cartridge or the ink cartridge’s plastic tab is not properly locking the cartridge into the printer’s PRINTHEAD assembly. It is suggested to remove all HP 564 (564XL) ink cartridges from the printer and slowly re-install each cartridge, ensuring each 'clicks' into place properly. You may need to gently pull out on the ink cartridge’s plastic latching tab so it extends away from the cartridge body. Reinstall cartridge into printer to see if the issue has been resolved. If blank pages or output print quality is extremely poor (for example, you observe several missing colors in the Self-Test or Print Quality Diagnostic Report where otherwise all colors should normally be present with no visible streaking), then the cartridge may have trapped air inside. In 99% of the cases you'll either need to let the refilled ink cartridges 'fully absorb' the new ink for approx. 36 hours first (since they may have been 'dry' when you brought them in for refilling), or you'll need to perform a 'Clean Printhead' procedure from your printer's menu 2-3 times to reprime all of the ink lines. To clear trapped air bubbles that may have formed between the cartridge and printhead, at the 'TOOLS' menu, select 'Clean Printhead' (or similar depending on printer model). To verify proper color output, activate the 'Print Quality Report'. Select 'Tools' - 'Print Quality Report', or similar. Verify all colors have recovered and no visible streaking or fade is present in print report. If streaking or missing colors persist, then activate the 'Clean Printhead' routine 2 more times. If, after activating the 'Clean Printhead' routine 2 times in a row, along with manufacturer's suggested printer cleaning procedures, blank pages continue to be observed or output print quality is extremely poor (for example, there are several missing colors in the Print Quality Diagnostic Report or Self Test Page where otherwise all colors should normally be present with no visible streaking), then the printhead may have partially dried out and a hot water flush may be necessary to help recover the ink system. If any cartridge or print quality issues persist then refer to advanced HP printer diagnostics: http://inkjet411.com/?page_id=1813