Canon imageCLASS LBP6780dn review

A paper-focused monochrome workgroup reference

The Canon imageCLASS LBP6780dn is an earlier U.S. monochrome printer for an office that already has another way to scan, copy and fax. Its useful combination is an included 500-sheet cassette, a 100-sheet multipurpose tray, automatic two-sided printing and a wired network connection. The exact U.S. brochure identifies item 6469B006AA. It is a printer rather than a multifunction unit, so no scanner or document feeder is part of this assessment.

The main configuration trap is password printing. Canon's actual operating guide requires an optional SD card for Secured Print. That is a material purchase condition: a base printer does not satisfy a PIN-release requirement just because the manual contains a protected-print chapter. Inspect the installed hardware before relying on that feature in an existing unit.

Use the actual driver for automatic duplex

Native computer printing can use USB or the built-in Gigabit Ethernet interface. Install the exact supported Canon driver, select the printer in the application and use its Finishing controls to choose one-sided or two-sided output. The guide also explains binding-edge and gutter choices. Automatic duplex is positively supported for Letter, Legal and A4, with the stated 60–120 gsm paper restrictions.

The paper path matters during duplex work. Close the rear face-up output route before starting a two-sided job, and leave a partly emerged sheet alone while the printer draws it back for the reverse side. Rear face-up output is a different routine for media that benefit from a straighter path; it cannot be combined with automatic duplex.

Canon declares up to 42 one-sided Letter pages per minute and separately up to 20.5 two-sided Letter pages per minute on plain paper. Those are manufacturer figures, not a hands-on timing result. The published optimum monthly range is 1,000–4,000 prints. Its much larger 100,000-page maximum is not the recommended recurring workload; the original service specification explicitly distinguishes those limits.

Count the supplied trays before the expansion maximum

The included configuration provides 600 normal Letter sheets at the U.S. specification's 20 lb bond basis. Two additional 500-sheet cassettes can raise the maximum to 1,600, but they are accessories. A photograph or secondhand listing showing a taller stack should be checked against the actual supplied configuration.

The operating guide also shows that heavier paper reduces stack capacity. At its stated 75 gsm basis, the ordinary drawer holds approximately 500 sheets and the multipurpose tray approximately 100; at 91 gsm, those figures fall to about 400 and 80. Load within the guides and the correct limit rather than treating the maximum normal-paper number as a capacity for every medium.

Envelopes belong in the multipurpose tray. Flatten and prepare them as instructed, print on the front rather than the glued side, and use the rear face-up output. The declared envelope stack is ten. For Legal output into the normal face-down tray, extend the auxiliary support so the longer sheets do not hang unsupported.

Protected jobs need both storage and software

With the optional SD card installed, the native driver can submit a job through Secured Print and associate it with a user name and password. At the printer, bring it online, open the job menu, select the stored document and enter the PIN. The panel accepts numbers; the more specialized encrypted workflow has separate driver add-in and Remote UI conditions.

Stored documents are temporary. The guide describes deletion after printing, reset, power-off or the configured inactivity period, with one hour as the original default. Card capacity can also prevent a new protected job from being stored. These conditions make hardware verification and the exact driver important for an office replacing an older secure-print setup.

Supplies and room around the printer

The included toner is declared at 6,000 pages. Replacement Cartridge 324 has the same 6,000-page declaration, while Cartridge 324 II is rated at 12,500. The actual consumables section specifies ISO/IEC 19752 on Letter at default density. Those yields support supply planning, but do not predict the result of dense forms or establish a current cost per page.

The U.S. specification gives a loaded weight of approximately 39.7 lb and a closed body measuring 17.9 inches wide, 16.7 deep and 13.6 high. Rear output and maintenance need extra access. Choose this earlier model for its documented wired printing and substantial included paper supply; choose a verified multifunction or standard-PIN alternative when those capabilities are essential.