Hello, I changed one of the OPC cylinders for a new one, for a repetitive mark that appeared on the print, the brand disappeared, but it kept staining as a loss of toner (sporadic spots or spots without any pattern). Check the belt unit and it looked scattered toner, but the drum unit looked clean, as did the toner cartridges. Until I checked the residual toner box and realized that it was saturated and I was already throwing it away, what I did was disassemble this box, take out the toner, clean it and reassemble it. I send images of com prints now. [list] [*] Image 01 and 02 is when proof print is sent from the copier, it does so on both sides of the sheet automatically. [*] Image 03 is when proof print is sent from the computer in the device properties (it only stains the sheet at the beginning and at the end). [*] Image 04 is the same as Image 03 but as without color (only stains the sheet at the beginning and at the end). [/list] Please ignore the upper left corner of image 01 and 02, the sheet is cut, side by side is similar. Thank you for your attention in advance. [Img] https://adjuntos.yoreparo.com/imagen_post/0004/46/bab1e3ec193468625383b55ce2ee6f0545a9225c.jpeg [/img] https://adjuntos.yoreparo.com/imagen_post/0004/46/10fd77fc6db4fca45e733bef73038a2a3cb21fdf.jpeg" alt="" />