What safety precautions should I take when using the paper trays?

Do not extend more than one paper tray at a time, do not use paper trays as a step, keep hands out of paper trays when closing them, and ensure all trays are closed when moving the printer. Additionally, never add or remove paper from Tray 1 during printing to avoid jams. (Page 15)

From the official HP Laserjet Pro Mfp M329 Printer manual, page 15

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使用纸张托盘时的安全建议有哪些?
Do not extend more than one paper tray at a time, do not use paper trays as a step, keep hands out of paper trays when closing them, and ensure all trays are closed when moving the printer. Additionally, never add or remove paper from Tray 1 during printing to avoid jams. (Page 15)
使用纸张托盘时的安全建议有哪些?
Do not extend more than one paper tray at a time, do not use paper trays as a step, keep hands out of paper trays when closing them, and ensure all trays are closed when moving the printer. Additionally, never add or remove paper from Tray 1 during printing to avoid jams. (Page 15)
Why should I close all trays before moving my HP printer?
Do not extend more than one paper tray at a time, do not use paper trays as a step, keep hands out of paper trays when closing them, and ensure all trays are closed when moving the printer. Additionally, never add or remove paper from Tray 1 during printing to avoid jams. (Page 15)
在处理纸张托盘的时候应该注意哪些安全事项?
Do not extend more than one paper tray at a time, do not use paper trays as a step, keep hands out of paper trays when closing them, and ensure all trays are closed when moving the printer. Additionally, never add or remove paper from Tray 1 during printing to avoid jams. (Page 15)
打开多个纸张托盘对我的HP MFP M329有害吗?
Do not extend more than one paper tray at a time, do not use paper trays as a step, keep hands out of paper trays when closing them, and ensure all trays are closed when moving the printer. Additionally, never add or remove paper from Tray 1 during printing to avoid jams. (Page 15)
What happens if I add paper to Tray 1 during printing?
Do not extend more than one paper tray at a time, do not use paper trays as a step, keep hands out of paper trays when closing them, and ensure all trays are closed when moving the printer. Additionally, never add or remove paper from Tray 1 during printing to avoid jams. (Page 15)

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