Troubleshooting laser printer quality

For laser printers, because it works similar, so a lot of quality failure is also a variety of models can be generic. Laser printers when using a certain number of years, that output a certain number of proofs, its print quality will decline, some parts used to the limit, there will be print quality defects. Some are because of our principle and performance of laser printers is not familiar with, so its not in operation to perfectly adjust status or Huan in the wrong state, it is also used material non-compliance, so the output results are poor, this is what we call "failure is not failure." It generally does not affect normal printer, but print out the result was not satisfactory and so on. Here are some print quality problems and solutions.

    Black sheet of paper output

    Possible failure reasons:

    (1) If the laser is certainly good, it may charge electrode and the grid short circuit;

    (2) scanning drive circuit logic error;

    (3) cartridge component discharge bad;

    (4) signal cable is not connected well.

    Check the location and repair methods:

     (1) the first replacement cartridge component, to see whether the fault disappears, and if so, explain the problem component is a cartridge, the replacement. The entire page appears the phenomenon of black, indicating laser is definitely good. Therefore, we can first replace a new toner cartridge re-print, if the failure to eliminate, cartridge components are sufficient to prove a problem, then check the photosensitive drum can be highly charged, magnetic roller bias electrode and the photosensitive drum is good contact electrode consumption if what point connection is bad, should find and fix.

    (2) and then check the charging wire and mesh electrodes are short-circuit or poor contact, and if so, should replace the repair or cleaning. We know that the vast majority of cartridge components for different structural models are not the same, but its working principle is the same. The use of wire electrodes charged toner cartridges, if electrode wire insulation blocks char, rather than, and can be multimeter resistance range measuring electrode wire and between the grid to see whether short-circuit, short or if the resistance is small, clean or replace the insulation seat. In addition, the electrode wire can also cause pollution or displacement of this fault, it is necessary to clean or correct electrode wire.

    (3) If the above checks are good, then the fault probably is the laser scanning frequency component drive circuit or logic circuit, it should check the scan logic circuit is damaged, replace the scanning component.

    (4) sometimes as a printer with multiple computers linked to the signal line often swap (we are opposed to the regular plug with a signal line approach to multiple computers together, because it will cause the signal line pin and socket for damage), while the signal cable is damaged or plug is not strong, so that some signals can not pass, then it will cause the output black proofs of failure, it can first check in the check is good and the signal cable is plugged in, to avoid other necessary maintenance.

    Output full-vertical black belt (line)

    Possible failure reasons:

     (1) photosensitive drum scraper or scraper on the damaged property on which Lee scratch photosensitive drum;

     (2) magnetic roller scraper local damage;

     (3) Printers (general guide roller channel) is toner contamination.

     General repair methods:

     (1) First observation of the output proofs of the Black Belt is like blurred, if so, then clean or replace the imaging drum scraper. If not, then check whether the vertical drum scratched traces, if so, then check whether the local drum scraper damage, in general, output proofs have a vertical black line, indicating drum longitudinal (circumferential direction ) a more visible scratch, it can only replace the imaging drum, but it should also carefully check whether the cleaning scraper sticky material benefit or injury, you should remove or replace the scraper so as to prevent scratching the drum.

     (2) If the problem is not photosensitive drum, magnetic roller scraper can check whether a foreign body or a defect, it simply will not limit the role of ink, toner and imaging drum beat distance between the no magnetic Local roller direct adhesion to toner on the photosensitive drum surface to form a black line. The solution is to clean magnetic roller scraper or replace magnetic roller scraper.

     (3) In addition to the above two reasons, the printer (general guide roller channel) is the formation of black toner pollution will be failure. When the printer take paper channel guide roller melt the toner have gathered, when the printing paper through friction to the print paper, will form a black line. For this reason the formation of the black line, generally are subject to change shades, line edge is vague, as the above two reasons clear, the channel was contaminated most of the toner transfer wheel, upper and lower heat rollers and other parts, so you want to clear This may turn off the printer power when hot to remove these dirt. However, if the upper and lower heat roller caused damage or aging, though cleaning will solve the problem temporarily, but soon will reproduce the failure, it should consider replacing the upper and lower heat roller.