Probable causes: low toner, dirty cartridge, non-HP cartridge, or incorrect paper.
- Check toner level via the control panel or HP Smart app.
- Run the cartridge cleaning cycle. Open the Embedded Web Server (EWS). Go to the System tab, click Service. In the Cartridge Cleaning Mode area, click Start.
- Print a cleaning page for internal debris. In EWS, System > Service. In the Fuser Cleaning mode area, click Start.
- Inspect the toner cartridge. Remove it and verify the sealing tape is gone. Check the memory chip for damage. Replace cartridge if damaged.
If that didn't work: Confirm you are using an Original HP cartridge in official HP packaging. Non-Original or refilled cartridges cause print defects. Enable the Cartridge Policy in EWS (System > Supply Settings) to block unauthorized cartridges.
Heads up: Always use paper designed for laser printers, of good quality, and within the supported weight. Rough or incorrect paper causes toner adhesion issues.