Tools/raw materials: printer, A4 paper.
1. First, turn off the power.
2. Open the right cover to dissipate heat and let the toner cartridge cool for three minutes.
3, by hand, directly along the red line.
4. Pull the paper below with your hand, slowly and forcefully, and pull it up.
5. Carefully pull down the paper with the same force.
6. Do not cover the right cover of the cable. When the panel prompts to open the right cover when the power is turned on, cover it back.
7. The green key and red dot indicate disappearance, and it will return to normal after a few seconds, and the panel will return to normal display.