Brother MFC-L5900DW: single-pass duplex scanning with Legal-size glass review

Capture both sides without changing the print engine

The Brother MFC-L5900DW suits an office that digitizes two-sided documents and prints or copies in monochrome. Its useful distinction is a 70-sheet automatic document feeder that Brother explicitly describes as single-pass duplex. It also has full Legal-size glass, so the workflow is not restricted to originals suitable for feeder transport.

Single-pass describes how the scanner captures the original, not how fast the printer produces paper. Color scanning is supported, but the laser print engine and paper copies remain black-and-white. The 3.7-inch color touchscreen is another separate feature. Choose a color-printing model when the final paper document must retain color.

Legal scanning has two actual paths

The original USA guide permits ADF documents up to 8.5 × 14 in., with the specified 17–24 lb original weight range and 70-sheet capacity based on 20 lb paper. Its operating instructions expose two-sided Long Edge and Short Edge scan settings and document-size selection for the supported computer workflow.

The same guide gives MFC-L5900DW glass up to 8.5 × 14 in. That is a genuine Legal flatbed, unlike related models with a shorter glass. Use it for an original that should not pass through the ADF, keeping the feeder empty as instructed. Allow enough room above the unit to open the cover and handle the original safely.

The declared duplex scan maximum is 56 black images per minute or 34 color images per minute. Brother’s footnote uses Letter test documents at 300 dpi with advanced features turned off. Those image rates are not print pages per minute, do not promise the same rate for Legal documents, and are not our own timed test results.

Choose the computer and network arrangement

USB, Gigabit Ethernet and 802.11b/g/n Wi-Fi support the documented desktop print and scan software. Gigabit is confirmed for this exact variant; the neighboring MFC-L5800DW has a different LAN entry. The computer-requirements table also distinguishes desktop scanning from narrower Server network-printing support.

The scan-to-file instructions select the destination computer when using the network, then expose the supported scan options. Check the actual driver, ControlCenter software and operating system before relying on an older machine. A network computer-selection PIN is distinct from the print-job release password.

AirPrint and Mopria are listed for the documented wireless-network setup, and Wi-Fi Direct is a separate peer option. A USB scan path cannot borrow those network mobile-printing protocols. Historical cloud-service names do not establish that every named service remains available today.

Keep print input and held jobs separate

The included paper arrangement is a 250-sheet cassette plus 50-sheet multipurpose tray, using the maker’s 20 lb plain-paper basis. Both support ordinary Letter, Legal and A4 sizes. The advertised 1340-sheet maximum needs optional lower trays; it is not the base printer’s included capacity.

The USA automatic-print-duplex list includes Letter and Legal among its named sizes, with its own paper-type and weight restrictions. It does not list A4 for this edition. Suitable envelopes use the MP path and their documented handling routine, rather than an assumed automatic two-sided process.

For confidential Windows print jobs, the original Brother-driver Secure Print routine assigns a separate four-digit password to each document. Select the job at the touchscreen and enter that password to release it. The data is cleared after printing and when power is turned off. This is temporary job holding, not a universal mobile-app security guarantee.

Assess the earlier office package

Brother declares up to 42 one-sided Letter pages per minute; print duplex is separately 20 sides per minute, or 10 sheets per minute. The recommended monthly maximum is 3500 pages, distinct from the 50000-page duty cycle. Select a higher recommended workload for sustained heavier use.

The original package lists roughly 3000-page toner and a separate DR820 drum with job-length-dependent life figures. Check remaining supplies and the suitable telephone connection needed for analog fax. The USA 110–120 V body weighs 38 lb and measures 19.5 × 16.8 × 19.1 in. Brother marks it discontinued. Choose this earlier model for its verified duplex capture routes, after confirming software, condition and service access.