For the best quality printing from your Epson AcuLaser C2600N AL-C2600N AL-2600N colour laser printer, it will ask you every 40,000 pages or so to replace the photoconductor unit. This is also known as the drum unit. It is very important as it transfers the toner to the paper during the printing process, so if there is any wear marks or scratches on the drum it will adversely affect the print quality.
The Epson AcuLaser C2600N Photoconductor Unit product code is S051107 and costs around 30% more than the high yield black toner for this printer.