Samsung I was always excited (have hard drives, monitors, TV, mobile phones) - so I bought two new printers and make as this, a printer in - SW, which is still functioning and in color. But when the first ink cartridge of the CLP-680 slowly came to an end, the trouble began. Around the same time there were along the right side of a long sheet through color dropout (white line on blue the background) and the message (ie red) that magenta is replaced. After replacing then came the error message "Install TR. Belt Unit". Pause or restart Stomversorgung and reconnect - everything did not help. Will return the device. Unfortunately, I've already stocked with original toner cartridges.