Lexmark T640n: shared wired monochrome printing with PIN release review

A wired shared queue with local job release

The Lexmark T640n is the network-equipped T640 configuration, combining monochrome laser output with a documented confidential-print routine. Exact US part 20G0150 includes 10/100BaseTX Ethernet and USB computer connectivity. It fits a wired workgroup printing within the maker's recommended 3,000–14,000-page monthly range when users need to release selected jobs at the machine.

The n package does not include automatic duplex. Lexmark lists the matching duplex unit as available separately, while T640dn is the explicitly equipped package. Check the actual suffix and installed hardware on an offered printer rather than assuming network readiness also supplies two-sided output.

Establish the network and the confidential workflow

The original guide describes printing a network setup page, checking its connected status and confirming the IP address before installing the printer on network computers. DHCP and manually assigned addressing have different setup steps. A working Ethernet cable alone does not create the required print queue or select the correct software.

USB Type-B remains a separate direct-computer option. Wireless and gigabit interface options are not the supplied Fast Ethernet configuration. Verify current compatible software on the intended systems; the guide's historical Windows and Mac instructions establish operation, not blanket support for every newer platform.

Compatible Windows software submits confidential jobs through Print and Hold. The Mac procedure uses Job Routing and Confidential Print. Enter a user name and four-digit PIN using digits 0–9, then select the user and confidential job at the panel to release it with the matching PIN. The job stays in printer memory until the documented release or deletion action.

Optional disk encryption is a separate function. Other held-job types, including Verify, Reserve and Repeat, have different behavior and do not all require a PIN. Select the confidential routine when protected local release is essential rather than treating every held job as secure.

The 350-sheet load is two ordinary sources

The supplied drawer holds 250 sheets and the multipurpose feeder 100, totaling 350 on the stated 20-pound or 75-gsm basis. Letter, Legal and A4 fit both. Match guides, panel settings and driver size/type to the actual load. Matching sources can be linked through the documented settings; different stock should retain deliberate source choices.

The optional duplex unit mounts below the printer. The correct 250-sheet version matches the standard tray; the name does not mean it adds another paper drawer. Installing it changes the physical arrangement and may affect support-furniture requirements when combined with extra input hardware.

Suitable envelopes use their separate one-sided MPF routine, with up to ten under the guide's conditions. Select Envelope and the exact size, and avoid stamps, windows, clasps, exposed adhesive and damaged stock. The separately sold 85-envelope feeder is a different device.

Front PDFs and expansion require their own checks

The front USB Direct interface is for supported PDF printing from suitable FAT-formatted storage. NTFS, encrypted files and files without printing permissions are excluded by the guide. Select the document and quantity at the panel and leave the device connected until the job finishes.

The 3,850-sheet maximum input, larger output bins and finishing arrangements require optional equipment. Base output is 250 sheets. Check installed drawers and driver recognition, and follow the specified furniture requirements for larger floor-mounted combinations. These are paper-handling options, not scanning, copying or fax hardware.

Regular volume, supplies and condition

Lexmark declares up to 35 one-sided Letter pages per minute. The 200,000-page maximum duty rating is distinct from the recommended monthly ceiling and does not describe an ordinary workload target. Neither rating is a measured application result.

The original US supplied cartridge declares 6,000 pages, with Americas replacements at 6,000 or 21,000 under ISO/IEC 19752. Do not borrow the T644's 32,000-page option. Inspect maintenance condition and any special label-printing components on this discontinued model. Check the electrical label and operating clearance, or compare an explicitly duplex-equipped or scanner-equipped configuration when those routines matter.