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SKU : 29S0150

Brand : Lexmark

Monochrome Laser

Duplex (2-sided) Printing: Integrated Duplex

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Give every small workgroup color output with the compact, lightweight Lexmark CS431dw, ready to network or share wirelessly with output at up to 26 ppm.

Classic connections, wireless convenience

In addition to Gigabit Ethernet and USB connectivity, dual-band Wi-Fi makes it fast and easy for mobile users to get output via the Lexmark Mobile Print app, as well as Google Cloud Print, Mopria®, and AirPrint technologies. And the Lexmark Mobile Assistant app simplifies wireless configuration.

Compact and durable

Compact and lightweight, the CS431dw fits almost anywhere. But its steel frame and long-life imaging components mean it’s also built to last.

Color you can count on

Get rich, vibrant color in seconds with Lexmark’s unique Unison™ toner. And easy-to-change Extra High Yield replacement cartridges give you more printing and less downtime.

Full-spectrum security

Lexmark’s comprehensive approach to product security is a design and engineering mandate across our entire product portfolio. Our security features help keep your information safe—in the document, on the device, over the network, and at all points in between.

Save paper, save energy

Automatic two-sided printing is standard, along with built-in energy-saving modes that help support ratings of EPEAT® Silver and ENERGY STAR® certified. The Lexmark Cartridge Collection Program (LCCP) and Lexmark Equipment Collection Program (LECP) minimize waste and support recycling (availability varies by country).

Interact with ease

A 2.8-inch [7.2-cm] color touch screen enables convenient interaction with essential system functions and task information, while built-in cloud connectors let you securely access files from popular cloud services Box, DropBox, Google Drive, and Microsoft OneDrive.

Additional information

Print Technology

Monochrome Laser


Copying, Color Scanning, Printing, Network Scanning, Faxing

Workgroup Size

Small Workgroup


2.8 inch (7.2 cm) LCD touch panel

Media Sizes Supported

A6, Oficio, 7 3/4 Envelope, 9 Envelope, JIS-B5, A4, Legal, A5, Letter, Statement, Executive, Universal, DL Envelope, Folio, 10 Envelope

Included Paper Handling

100-Sheet Multipurpose Feeder, Integrated Duplex, 150-Sheet Output Bin, 250-Sheet Input

Standard Ports

USB Compatible with USB 2.0 Specification (Type B), Ethernet 10/100BaseTX (RJ-45)

Size (in. - H x W x D)

13.3 x 16.2 x 14.4 in.

Weight (lb.)

28.2 lb.

Packaged Size

15.16 x 16.54 x 18.31 in. (H x W x D)

Packaged Weight (lb.)

32.41 lb.

Copy Speed

Up to: Black: 40 cpm (Letter)

Copy Speed Duplex

Up to: Black: 17 spm (Letter)

Time to First Copy

As fast as: Black: 6.2 seconds

Reduce / Enlarge Range

25 – 400 %

Modem Speed

ITU T.30, V.34 Half-Duplex, 33.6 Kbps

Fax Transmission Speed

< 3 seconds per page

Print Speed

Up to: Black: 40 ppm (Letter)

Print Speed Duplex

Up to: Black: 17 spm (Letter)

Time to First Page

As fast as: Black: 6.2 seconds

Print Resolution

Black: 2400 IQ (2400 x 600 dpi), 600 x 600 dpi


2-sided: Integrated Duplex

Printable Area

0.2 inches of the top, bottom, right and left edges (within)

Scanner Type / ADF Scan

Flatbed scanner with ADF

Scan Area

8.5 x 14 inches (Maximum)

A4/Ltr Simplex Scan Speed

Black: 46 / 48 sides per minute, Color: 20 / 21 sides per minute

A4/Ltr Duplex Scan Speed

Black: N/A sides per minute, Color: N/A sides per minute

Scan Technology


Optical Scanning Resolution

Up to 600 X 600 dpi (color)

Scan File Formats


Scan Destinations

e-mail, Lexmark Document Solutions Suite (LDSS), USB or Network connected computer, FTP


50-Sheet Automatic Document Feeder

ADF Paper Input Capacity / ADF Paper Output Capacity

Up to: 50 pages 20 lb or 75 gsm bond, Up to: 50 pages 20 lb or 75 gsm bond

Media Types Supported

Paper Labels, Card Stock, Plain Paper, Envelopes, Refer to the Paper & Specialty Media Guide

Finishing Option


Number of Paper Inputs

Standard: 2, Maximum: 3

Paper Input Capacity

Standard: 350 pages 20 lb or 75 gsm bond, Maximum: 900 pages 20 lb or 75 gsm bond
350 pages 20 lb or 75 gsm bond

Paper Output Capacity

Standard: 150 pages 20 lb or 75 gsm bond, Maximum: 150 pages 20 lb or 75 gsm bond

Paper Weight Range Supported

16 – 32 lb. (Standard Tray), 16 – 58 lb. (Multipurpose Feeder)

Optional Paper Handling

550-Sheet Lockable Tray, 550-Sheet Tray

Maximum Monthly Duty Cycle

Up to: 50000 pages per month

Laser Cartridge Yields

3,000-page Cartridge, 15,000-page High Yield Cartridge

Imaging Unit Estimated Yield

Up to: 40000 pages, based on 3 average letter/A4-size pages per print job and ~ 5% coverage

Cartridge(s) Shipping with Product

1,500-page Return Program Toner Cartridge

Replacement Cartridges:

Product functions only with replacement cartridges designed for use in a specific geographical region.

Processor Speed

Dual Core, 1.0 GHz


Standard: 512 MB, Maximum: 512 MB

Hard Disk

Not Available

Printer Languages

PCL 5c Emulation, PCL 5e Emulation, PCL 6 Emulation, PostScript 3 Emulation, Direct Image

Fonts and Symbol Sets

2 PCL bitmap fonts, For more information, refer to the Technical Reference., 89 scalable PostScript fonts, 3 of 9 scalable PCL 5e fonts in Narrow, Regular and Wide, 89 scalable PCL fonts

Touch Screen Display


Direct USB


Ethernet Network



Wireless Option

Network Protocol Support

TCP/IP IPv6, IPSEC w/ IPv4, IPSEC w/ IPv6, TCP/IP IPv4, ICMP, TCP, IGMP, UDP, 802.1x

Network Printing Methods

LPR/LPD, Microsoft Web Services WSD, FTP, TFTP, Enhanced IP (Port 9400), IPP 1.0, 1.1, 2.0 (Internet Printing Protocol)

Network Management Protocols

DHCP6, BOOTP, RARP6, mDNS6, IGMP6, WINS6, DDNS6, SNMPv36, SNMPv1, SNMPv2c6, Telnet6, NTP6, ICMP6, HTTP6, DNS6, ARP6, HTTPs (SSL6/TLS)6, SMTP6, Finger

Network Security

SNMPv3, 802.1x Authentication: MD5, MSCHAPv2, LEAP, PEAP, TLS, TTLS


1-Year Advanced Exchange, Next Business Day

In the Box

Software and documentation CD
Up to 40,000 pages** return program imaging unit
Up to 1,500 pages* return program toner cartridge
Lexmark MX331adn multifunction laser printer
Stability sheet and safety sheet or booklet
Statement of limited warranty / guarantee
Power cord(s)
Setup guide or sheet (network and local attachment)