Your needs, this model
Does it fit your priorities?
Can I print color Legal reports on both sides over Wi-Fi at 4,500 monthly pages, with Mopria and PIN release for supported computer jobs?
Yes, with suitable network access and compatible software. The standard Legal duplex arrangement supports the documented network mobile route and driver PIN routine within the 5,000-page recommended maximum.
Explore this need in the finder →Does the standard Letter package include 500 paper-input sheets?
No. Standard input is 250 sheets plus one-sheet manual feed. The larger 750+1 maximum needs optional drawers.
Explore this need in the finder →Can the touchscreen printer also scan and copy paper documents?
No. Lexmark explicitly classifies CS431 as print-only color hardware; the touchscreen does not provide a scanner or copier.
Explore this need in the finder →A touchscreen changes operation, not the print-only scope
The Lexmark CS431dw is a US color printer reference for a small workgroup that wants automatic duplex, network sharing and a touchscreen without adding scanner hardware. Its practical advantages over a simpler compact configuration include the 2.8-inch panel, documented 802.11ac wireless and optional paper expansion. The tradeoff is that the base machine still has a 250-sheet main stack.
The exact US reference is part 40N9320. Confirm the actual suffix, regional unit, compatible software, included equipment and supply condition when comparing a machine or offer. The manufacturer's current product reference is not a promise of current stock or a new warranty. Do not treat a photograph of added trays as proof that those accessories are included.
Keep the Letter print rate and duplex routine together
Lexmark declares up to 26 one-sided Letter pages per minute in black or color. Automatic print duplex is separately rated at 13 Letter sides per minute. These are manufacturer specifications, not measurements from testing for this article. The color touchscreen does not raise the print engine's declared rate or turn a two-sided job into the faster one-sided mode.
Letter, Legal and A4 are positively supported in the ordinary main input and duplex path. Envelopes follow the instructed one-sided media routine, with different loading and stock limits. The one-sheet manual feeder is useful for an occasional alternate item rather than a second substantial stack. A general supported-media list should not be used to promise automatic two-sided handling for every stock.
The expansion figure requires an actual paper package
Standard input is 250 sheets plus a one-sheet manual feed on the stated 20-pound or 75-gsm basis. The exact model lists optional 250-sheet trays and a 750+1 maximum, but those drawers are separate equipment. If different letterhead or longer uninterrupted runs are central to the office routine, identify the real installed tray arrangement before assigning it a larger capacity.
Lexmark recommends 750–5,000 printed pages monthly, separately from its 75,000-page maximum duty ceiling. A larger paper package can reduce refilling but does not itself increase the recommended monthly range. The 100-sheet output capacity collects finished pages and should not be counted as another input source.
Network printing, peer setup and protected computer jobs
Included interfaces are USB Type-B, gigabit Ethernet and 802.11ac Wi-Fi. The Type-B socket serves a computer connection. A separate Direct USB field does not deny that explicitly specified interface. AirPrint and Mopria are documented shared-network printing routes, while the original guide also provides a Wi-Fi Direct computer setup.
These are distinct arrangements rather than a promise that every protocol works through every connection. A compatible Print and Hold driver can submit confidential PIN jobs for release at the touchscreen. Verify the actual software and release sequence; a mobile printing protocol does not establish protected submission from every phone application. Cloud connectors likewise depend on current firmware, service and account conditions.
Supplies and the work this machine does not perform
The supplied toner is declared at 1,500 pages for each CMYK cartridge under ISO/IEC 19798. Exact US extra-high-yield replacements include 20N1XK0 black at 6,000 pages and 20N1XC0, 20N1XM0 and 20N1XY0 colors at 6,700 each. These differ from the CS331 high-yield limits and MC/C cartridge codes. Match geographic compatibility and Return Program terms without deriving today's running cost from yield alone.
Lexmark explicitly classifies CS431 as print-only color hardware. There is no scanner, document feeder, copier or fax behind the touchscreen; generic app scanning text does not add those functions. The body is 16.2 inches wide, 15.5 deep and 9.6 high at 35.5 pounds, before optional trays and working clearance. Verify the electrical label and correct cord. This reference fits a shared color printing routine. Compare actual multifunction hardware for originals, or a complete expanded-input package when refilling is the main constraint.
Key details at a glance
| Color printing | Yes |
|---|---|
| Scanner | No |
| Copying | No |
| Fax | No |
| Flatbed scanner | No |
| Automatic document feeder | No |
| Automatic two-sided printing | Yes |
| Automatic two-sided scanning | No |
| Single-pass two-sided scanning | No |
| Color scanning | No |
| Instructed envelope handling | Yes |
| Apple AirPrint | Yes |
| Mopria printing | Yes |
| Supported PIN-release printing | Yes |
| Recommended monthly minimum | 750 pages |
| Recommended monthly maximum | 5000 pages |
| Maximum monthly duty | 75000 pages |
| Included ordinary-paper capacity | 251 sheets |
| Declared one-sided mono Letter rate | 26 pages/min |
| Declared one-sided color Letter rate | 26 pages/min |
| Unit-body width | 16.2 in |
| Unit-body depth | 15.5 in |
| Unit-body height | 9.6 in |
| Unit weight | 35.5 lb |
| Imaging engine | laser |
Use the exact model’s instructions for operating limits, supplied equipment and version differences.
Paper, software and setup details
Print-rate conditions
Maker maximum 26 one-sided Letter pages/minute black or color; automatic print duplex separately 13 Letter sides/minute. These are declared specifications, not measured throughput.
Paper handling
Included 250-sheet main tray plus one-sheet manual feed, standard 250+1 at 20 lb/75 gsm; per-size stack 250. Letter, Legal and A4 support automatic print duplex. Optional 250-sheet drawers can raise the stated maximum to 750+1, but are not included. Envelopes use the instructed simplex routine.
Scanning arrangement
Explicitly print-only color laser. Generic app/driver text mentioning document capture or scanning does not establish scanner, copier, fax or feeder hardware.
Computer and mobile connections
Included USB Type-B, gigabit Ethernet and 802.11ac Wi-Fi. Direct USB:No does not deny the separately listed Type-B computer connection. Original guide documents Wi-Fi Direct computer setup. AirPrint/Mopria are assigned to the shared-network route.
Supplies and declared yields
Supplied toner declared 1,500 pages each CMYK ISO/IEC 19798. Exact US 20N1XK0 black replacement 6,000 and 20N1XC0/20N1XM0/20N1XY0 colors 6,700 each; 20N10-family standard cartridges 1,500. Match geographic and Return Program conditions. CS331 4,500-page or MC/C supply codes are not substituted.
Software and support
Exact model page supports AirPrint and Mopria network printing. Original guide pages 37–38 supports compatible-driver Print and Hold confidential PIN jobs, including panel release directions for non-touchscreen models. Verify compatible current software; retired cloud listings are not service guarantees.
Electrical edition and setup
Exact US part and regional reference established. Nominal electrical input is not directly established in the read print-only sources; check the actual unit label and correct cord. Body measurements exclude operating and service clearance.
Sources for this assessment
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