Lexmark C734dn: wired color printing with automatic duplex review

Automatic back sides for wired color reports

The Lexmark C734dn is a color laser printer with included Ethernet, USB and an integrated automatic-duplex unit. US part 25C0351 fits a wired team producing reports, forms or correspondence within the maker's 1,500–9,200 recommended monthly pages. It declares up to 30 one-sided Letter pages per minute in either black or color.

This exact dn supplies duplex hardware that the C734n lacks. It does not include the C734dw's wireless radio, and none of those suffixes turns this print-only device into a scanner, copier or fax. The tilting four-line grayscale panel provides settings and status rather than document capture.

Keep paper size, type and duplex together

The original tables support Letter, Legal and A4 in both ordinary input paths and the duplex unit. Automatic duplex uses a narrower paper-weight range of 60–120 gsm than the engine's general media range. Do not assume that a thick stock accepted for one-sided output is also suitable for turning automatically.

Select the correct size and type in the panel and compatible computer software, then choose one-sided or two-sided output and the appropriate binding direction. Preprinted letterhead uses different loading orientations for simplex and duplex. Check a short example before committing a longer report or valuable stock.

Suitable envelopes are separate one-sided jobs through the multipurpose feeder. Use the correct size and Envelope type and follow the flap and leading-edge orientation. Envelopes, card stock, labels and transparencies do not inherit ordinary-paper duplex support merely because they appear in a general media list.

Understand what 650 included sheets means

The standard input combines a 550-sheet drawer and 100-sheet multipurpose feeder at the 20-pound or 75-gsm ordinary-paper basis. Letter, Legal and A4 fit both. For linked continuous feeding, load matching stock and settings and put the multipurpose feeder in Cassette mode.

That feeder is an open, extended source. When it carries envelopes or another special stock, it replaces its ordinary-paper load and needs its own settings. The supplied output bin's 300-sheet figure is separate, so a full input load may require output collection. Optional drawers and the 3,750-sheet input maximum are additional hardware.

The exact specification lists 18.5 inches of closed-body depth and 20.7 inches with trays extended. Leave further room for loading, covers, ventilation and supply replacement. A body measurement alone does not describe the working footprint.

Use the wired route and confidential release properly

USB Type-B connects a computer; Ethernet provides the included network path. Print a network setup page, confirm Connected status and use the correct IP address and driver. Wireless, gigabit, parallel and serial interfaces remain options. The front Type-A socket supports documented flash-drive and PictBridge camera output, with different setup requirements from a computer queue.

Compatible Windows Print and Hold or Macintosh Job Routing software can submit a confidential job with a user name and four-digit PIN. Select the held job and enter the PIN at the printer keypad. Jobs use memory and can be deleted under memory pressure; optional-disk encryption has separate hardware conditions.

Check current software compatibility and important files rather than relying on historical lists. AirPrint and Mopria are unestablished here. The Black Only and Max Speed/Max Yield controls also have different purposes; content-driven color switching can affect output rate. The separate black Letter duplex declaration is 20 sides per minute, not a color duplex or whole-job timing.

Inspect more than the toner level

The exact US supplied Return Program toner declares 4,000 black and 4,000 composite CMY pages. Replacement declarations are 8,000 black and 6,000 CMY under ISO/IEC 19798 on the maker's continuous-print basis. Check each cartridge, its compatible region and program conditions.

Photoconductors, the waste toner container, fuser and transfer module are separate components. Inspect their status and the correct fuser voltage as well as toner. The 85,000-page maximum monthly duty figure does not replace the recommended 9,200-page ceiling. Lexmark marks this 56.7-pound model discontinued; check its electrical label, cord, software and condition. Compare a documented wireless or multifunction model if those capabilities would simplify the station.