49Washing Cleaning RollerCleaning roller will remove stain or contamination on cards and will get dirty gradually. If you find stain orcontamination on the issued cards, wash the Cleaning roller. We recommend washing the Cleaning rollerwhen replacing the Thermal Transfer Ribbon.1. Unlock the Top Cover by turning the key clockwise during the power on, and then open the Top Cover.The buzzer will beep, and the following error message will be indicated on the Main display.CV402 Top / Side2. Push the Print/Encode Unit Cover Open Button to open the cover.Open Top Cover.Turn this key clockwise.Open Print /Encode Unit cover.Print /Encode UnitPrint /Encode Unit Cover Open Button