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Understand DPI in printing and scanning, how it differs from image PPI, when higher DPI helps, and why quality settings affect speed and ink use.

Understand duplex printing, automatic versus manual two-sided printing, long-edge and short-edge binding, duplex scanning, and why settings disappear.

Understand laser printer drums, how they differ from toner cartridges, when replacement is needed, and how to avoid damaging the drum surface.

Understand print servers, including network printers, shared USB printers, router or NAS print servers, dedicated adapters, queues, and host-computer limits.

Compare remanufactured and new ink cartridges by cost, quality, clog risk, warranty, chip warnings, printer lockouts, and mixed-cartridge use.

Understand collated versus uncollated printing, when to use each, where to find the setting, and why page stacks can still look reversed.

Fix false out-of-paper messages by fully reloading the tray, setting guides, cleaning paper sensors, checking manual feed, humidity, rollers, and sensors.

Fix laser printer toner smearing by matching paper type, running fuser cleaning, reseating toner, warming the printer, and identifying fuser wear.

Fix PDF printing failures by clearing queues, trying another viewer, printing as image, compressing large files, batching pages, and updating drivers.

Fix generic Error Printing messages by clearing queues, restarting the spooler, simplifying files, reinstalling drivers, and checking Wi-Fi or USB reliability.