What action should I take if my print quality deteriorates?
Ensure you are using original HP ink cartridges and check estimated levels in both software settings and cartridge access door. Align cartridges (Page 57) with plain white paper in the tray. If issues continue, clean or replace problematic ink cartridges.
From the official HP Deskjet Ink Advantage 2135 All IN One Printer manual, page 57
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