T640dtn
The Lexmark T640dtn combined duplex printing with a second paper tray and network connectivity, essentially the full-house T640 configuration. Busier departments avoided tray-swap interruptions while the 640H high-yield cartridge stretched replacement cycles between maintenance visits. Everything about this variant was designed to run unattended for long stretches. Compatible 640H cartridges let this loaded workhorse keep producing at a fraction of OEM running costs.
| Cartridge | Color | Page yield |
|---|---|---|
| 640H (64015HA / 64035HA) | Black | ~21,000 pages |
Frequently asked questions
Which toner does the Lexmark T640dtn use?
The Lexmark T640dtn uses the Lexmark 640H high-yield black toner cartridge (OEM 64015HA or 64035HA).
How many pages will one 640H cartridge print in the T640dtn?
About 21,000 pages at 5% coverage (ISO/IEC 19752).
Will a compatible 640H cartridge damage my T640dtn or void its warranty?
No. Compatible cartridges are built to OEM specifications and do not void your printer’s warranty.
What is the difference between the 64015HA and 64035HA cartridges for the T640dtn?
The 64015HA is a Lexmark Return Program cartridge — sold at a lower price in exchange for returning the empty cartridge to Lexmark for recycling. The 64035HA is the regular version. Both print about 21,000 pages in the T640dtn.