Lexmark MX511de: US fax MFP with Legal glass and reversing scans review

A fax-equipped MFP with a useful Legal glass

The Lexmark MX511de suits a wired team whose paperwork includes two-sided loose sheets and originals that need to remain flat. The independently checked US package, part 35S5703, includes a 4.3-inch touchscreen, a 50-sheet reversing document feeder, Legal-size glass, analog fax and 350 sheets of combined input. Printed output is monochrome even though scanning and the display use color.

The original research lead points to a different regional part, 35S5783. That page gives A4 speeds, while the US page separately establishes 45 one-sided Letter pages per minute and 20 Letter sides per minute in duplex. Keep those regional records distinct when checking an offered machine, its supplies and electrical label. A matching model name does not make every regional package identical.

Two scanner routes, with automatic reversal

Letter, Legal and A4 are supported through the feeder and on the glass. This is a meaningful difference from smaller family members: the common paper table's Legal-glass footnote explicitly includes MX511. A fragile full-length Legal original therefore has a documented flat route rather than having to be fed through rollers.

Normal multi-page originals go faceup into the feeder, short edge first, with the guides adjusted. It captures both faces automatically by reversing each sheet. That mechanism is different from single-pass capture; compare the actual method if large recurring duplex batches drive the purchase. Books, photos, thin media and small items belong on the glass.

The US scan figures also separate black and color modes. Letter simplex scanning is declared up to 43 black or 20 color sides per minute, with duplex separately 19 black or 9 color sides. These specifications do not measure the complete time to process and save a particular file.

Set up the computer and telephone paths separately

The exact US source lists scanning to USB- or network-connected computers. Gigabit Ethernet can use the documented Scan Profile workflow: choose settings and a destination on the computer, submit the profile and initiate it at the touchscreen. Confirm current scanner software, destination permissions and the intended operating system before relying on a historical workflow.

USB Type-B connects a workstation. Front and rear Type-A interfaces have their own roles, with supported front flash-drive printing and scanning subject to file and FAT-format restrictions. Wireless needs an optional N8350 card. The exact US AirPrint listing supports appropriate shared networking rather than establishing an included radio.

Analog fax adds a separate telephone setup, station identity and suitable line or adapter arrangement. The Ethernet port is not the ordinary analog fax connection. If an office uses a voice service adapter, confirm fax compatibility for that installation instead of assuming the network settings complete the job.

Paper loads and protected computer jobs

The standard 250-sheet drawer and 100-sheet multipurpose feeder total 350 sheets on the declared 20-pound or 75-gsm basis. Letter, Legal and A4 fit both inputs and automatic duplex. Appropriate paper settings matter, and suitable envelopes use a separate one-sided feeder routine. Optional drawers are required to reach the 2,000-sheet maximum.

Compatible computer Print and Hold software submits confidential jobs with a four-digit PIN for local release. Expiration, invalid attempts and available memory affect stored jobs. The de model lists a hard disk as optional; do not borrow the included disk of a dhe configuration or promise optional OCR and advanced PDF processing without their stated upgrades.

Workload, toner and an earlier offered unit

The US recommendation is 2,000–12,000 pages per month, separate from its 120,000-page maximum duty cycle. The original starter declares 5,000 pages. Listed replacements are 60F1000 at 2,500, 60F1H00 at 10,000 and 60F1X00 or 60F0XA0 at 20,000 under ISO/IEC 19752. The separate 60,000-page imaging unit has another job and coverage basis.

Match regional and Return Program terms. Lexmark marks this model discontinued, so verify condition, working software and compatible supplies. Allow loading and service room around the 48-pound body. A confirmed wireless or single-pass MFP is a more suitable alternative when either capability is essential.