A Charger Roller is a tan or gray-colored foam rubber roller that is attached to the underside of the printer's top cover. The charge roller can be replaced separately or as part of the maintenance kit. It r is a critical component in modern electro photographic (EP) printers. Its function is to provide sufficient charge onto the OPC. If Charger Roller does not function properly, print quality problems such as non- uniformity in density, background and ghosting will result.