The duplexing assembly is a specialized component in many modern printers that enables automatic double-sided printing—also known as duplex printing.
Rather than requiring the user to manually flip pages to print on the other side, the duplexer takes over that function, flipping the sheet internally and refeeding it through the print path for the second pass.
This feature is especially important in business environments where paper conservation and professional double-sided documents are standard.
The duplexer typically consists of a system of rollers, sensors, and a paper-flipping mechanism integrated either internally or as an external module on the back of the printer.
A+ technicians must understand how duplex printing is enabled in the printer driver settings, often under the name “print on both sides” or “automatic duplex.”
Misconfigurations or mechanical issues—like jammed rollers or dirty sensors—can lead to one-sided printing or paper jams. Some duplexers are removable for maintenance or replacement, while others are built into the unit and require disassembly for access.
It’s essential to distinguish between manual duplex printing, where users flip pages themselves, and automatic duplexing, which relies on the printer’s internal hardware.
Technicians may be tasked with installing duplexer units on compatible models, configuring software support, or troubleshooting alignment issues when printouts don’t match up perfectly.
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