Installed in the photoconductor drum above the reflector such as dirt, the laser encounters the mirror on the dirt is absorbed, can not reach the photoconductor drum, thus the formation of a narrow strip of white stripes on the print paper. Carefully observe the laser transmission channel, the channel will be cleaned up, that can solve the problem.
The transfer roller is mounted below the print paper channel, which also attracts dust and paper dust, and some parts become dirty or contaminated, thus preventing the toner from being transferred from the toner cartridge to the print paper, which also causes a narrow white stripe to form on the print paper. Failure of the toner cartridge usually results in a large area of faded print. Remove the toner cartridge and gently shake it so that the toner inside the cartridge is evenly distributed, and if there is still little improvement, the toner cartridge should be replaced.