How to repair the common failures of laser printers

Repair method: Mostly due to the failure of the corona discharge filament or control circuit failure, making the laser has been emitted, resulting in the printout of the content of all black. Therefore, you should check whether the corona discharge filament has been disconnected or corona high voltage exists, the laser beam path in the beam detector is working properly.

Trouble: The printout is light.

Repair method: When the toner cartridge less toner, the development of low development voltage roller and toner photographic effect of the poor, but also cause the phenomenon of light print. At this point, remove the toner box gently shake, if the print effect does not improve, it should replace the toner box or adjust the printer toner box below a set of light-sensitive switches, so that it matches the light-sensitive sensitivity of the toner.

Trouble: Repeated smudges on the print paper.

Repair method: There is a certain regularity in the appearance of such phenomena, due to a piece of paper through the printer, the machine's 12 kinds of rollers turned more than one circle, the largest photoconductor drums turned 2 ~ 3 circles, the feed rollers may be turned 10 circles, when the paper appeared in the paper at equal intervals of the smudge, it may be caused by a dirty or damaged rollers.

Trouble: The most common trouble with printers is paper jams.

Repair method: When this fault occurs, the indicator light on the operation panel will glow and send an alarm signal to the host computer. There are many reasons for this failure, such as paper output path within the debris, the paper feed roller and other parts of the rotation failure, the paper box does not feed the paper, sensor failure, etc., to rule out this kind of failure is very simple, just open the cover, remove the cardboard can be, but be careful, you must take the direction of the paper feed, and never reverse the direction of rotation of any knob. If there are frequent paper jams, check the paper feed channel, remove debris from the output path, and the front edge of the paper should be just above the metal plate. Check that the paper exit roller is not worn or has a loose spring and not enough pressure, i.e., the paper cannot be fed into the machine. Paper out of the roller is worn, a moment can not be replaced, can be used to wrap the rubber band approach to emergency treatment. After winding the rubber band, increasing the rubbing friction, can make the paper back to normal. In addition, the paper loading tray installation is not normal, the paper quality is not good (too thin, too thick, moisture), will also cause paper jam or can not take the paper failure.

Trouble: The page image is horizontally misaligned.

Repair methods: photoconductor drum cleaning scraper aging; low surface temperature of the heat roller; heat roller surface fluorine film wear and tear, the surface of the adhesion of a lot of melted toner; rubber roller pressure is not enough.

Trouble: The printer outputs blank paper.

Repair method: the cause of this type of failure may be the developer roller did not absorb the toner, may also be the photoconductor drum is not grounded, so that the negative charge can not be released to the ground, the laser beam can not play a role in the photoconductor drum. In addition, the laser printer photoconductor drum does not rotate, there will be no image generated and transmitted to the paper. Disconnect the printer from the power supply, remove the toner cartridge, open the groove on the lid of the cartridge, in the photoconductor drum of the non-sensitive parts of the mark and then reloaded into the machine. Power on and run for a while, and then take out to check whether the mark has moved, you can determine whether the photoconductor drum is working properly. If the toner can not be supplied normally or the laser beam is blocked, the phenomenon of printing blank paper will also occur. Therefore, you should check whether the toner is used up, whether the cartridge is correctly loaded into the machine, whether the sealing tape has been removed or whether the laser irradiation channel is blocked. It is important to note that the power must be turned off when checking, as the laser beam may damage the operator's eyes.