In May 1997, Lexmark® introduced the Optra® S 1250, 1650, and 2450, a new line of network printers offering speeds of 12, 16, and 24 ppm per minute respectively and a maximum resolution capability of 1200 dpi for each model. A few months later, Lexmark added two more printers to the line, the 1620 and 2420, offering 16 and 24 ppm speed, as well as 1200 dpi capability, and based on the same 4059 engine as the previous three printers. In 1998, Lexmark added to the Optra S line yet again with the introduction of the 1255, 1625, 1855, and 2455.
These newest printers offer more processing power than preceding Optra S offerings. For example, the 1625 features 100 MHz compared to the 33 MHz processor of the 1620; the 2455 features a 133 MHz processor while the earlier 2420 featured a 66 MHz processor. Many options including duplexing, mailboxes, stackers, and Lexmark's impressive MarkVision management software have made these printers premier choices for corporate workgroups. The printer management software tells the end user the type of cartridge in the printer (7.5K or 17.6 page yield), the pages printed, the toner level ranging from full to empty and the approximate number of pages remaining.
The entire line of printers used the same cartridge, which was available in standard capacity (7,500 pages) and high capacity (17,600 pages). The two cartridges were essentially the same with the exception of the toner weight, 200 or 500 grams, and the physical characteristics of the encoder wheel. From a remanufacturing standpoint, the cartridge is mechanically simple to remanufacture. There are a few design features that make this cartridge somewhat unique: the location of the PCR in the printer, a PCR cleaning assembly incorporated into the wiper blade stamping, the toner metering system, and the encoder wheel that is a key element of the printer’s toner sensing technology.
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