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Lexmark 840 Series Printer User Manual
This manual covers the installation of the Lexmark 840 Series printer, including unpacking, connecting power and USB, and loading ink cartridges. It also describes the printer’s components, safety warnings, and warranty information.
The guide explains how to operate the printer, adjust printing settings, clean and calibrate the print head, replace consumables, and resolve common issues such as indicator‑light problems or slow printing. Contact information for Lexmark Support and the Solution Center is also provided. This manual is written in Chinese.
All Lexmark 840 Series documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What should I do if the printer's indicator light does not turn on?
Make sure the power cord is fully plugged into the printer's power supply and into a working electrical outlet, then press the power button.
How can I install the printer software?
Insert the supplied CD, follow the on‑screen instructions, and ensure the USB cable is securely connected between the printer and computer.
How do I replace the ink cartridge?
Remove the old cartridge and install a new one as described in the replacement section.
What should I do if the printer’s indicator light does not turn on?
Check the troubleshooting section for the “indicator light not lit” problem and follow the recommended steps.
How can I reduce radio interference from the printer?
Reorient or relocate the receiving antenna, increase the separation between the equipment and receiver, or connect the equipment to a different circuit.
What is the Lexmark customer support phone number?
You can call Lexmark customer support at 1‑800‑332‑4120.