How do I clear an E3 error on my HP Smart Tank 750 if I suspect a paper jam?

First, power off the printer and unplug it. Then, carefully open all access doors and trays (input tray, rear access door, and duplexer if applicable). Visually inspect the entire paper path for any jammed paper. Gently remove any paper fragments, ensuring you don't tear them. After removing any obstructions, close all doors and trays securely, plug the printer back in, and power it on.