1. Structure: The structure of the OPC is divided into a coating and a base material, and the base material is composed of an aluminum tube, and the coating can be roughly divided into a protective layer, a charge transport layer, and a charge generating layer. 2. Working principle: When OPC is exposed to charge and then contacted with toner, the toner will be absorbed and attached to the surface of the OPC due to the action of the electric field. 3. Note:The surface coating of the OPC is easily scratched and bruised;Keep the OPC away from direct sunlight and avoid long-term exposure of the fluorescent lamp.It is forbidden to hit the surface of the OPC with hard objects. It is forbidden to directly touch the coating of the printing area of the OPC by hand to avoid leaving sweat and oil, these actions will result in poor print quality.

1. DB structure: There are two kinds of DB: one is metal powder doctor blade, the other is rubber powder doctor blade, rubber powder doctor blade structure: it is composed of iron frame and rubber sheet; metal powder doctor blade structure: It is composed of iron frame and steel sheet. 2.Working principle: Control the thickness of the toner layer on the magnetic roller(MR)/developing roller(DR) and assist the toner to be charged and charged. 3.Note:The DB cannot be pressed against each other and are prone to deformation;If the rubber powder DB is stored for too long, the rubber will become yellow and aging . The metal powder DB should prevent extrusion and the steel sheet is deformed.

1. PCR structure: HP series charging roller is composed of iron shaft, sponge and casing, and Samsung series is composed of iron shaft and rubber. 2.Working principle: The PCR charges the surface of the OPC with a uniform charge. 3.Note:The PCR cannot be pressed against each other due to their structural reasons and will be deformed; The surface of the PCR cannot be wiped with a solvent;Failure to use a hard object to collide during operation (eg, tweezers) will damage the surface of the PCR.