Top 10 common printer Faults Analysis page 1/2

I. Printer output blank paper

For dot matrix printers, most of the reasons for Blank printing paper are due to the drying of the ribbon ink, tape pulling, printing head damage, etc., should be timely replacement of the ribbon or repair print head; For inkjet printers, most of the failures that cause blank printing are due to nozzle blockage and no ink for ink cartridges. The nozzle should be cleaned or replaced. for laser printers, this kind of fault may be caused by the fact that the video roller has not absorbed toner (the DC bias of the video roller is not added), or the photosensitive drum is not grounded, so that the negative charge cannot be released to the ground, the laser beam cannot work on the photosensitive drum.

In addition, no images are generated and uploaded to the paper if the photosensitive drum of the laser printer is not rotated. Disconnect the printer power supply, remove the toner cartridge, open the socket on the lid, mark the non-photosensitive parts of the photosensitive drum, and re-load it into the machine. Start the system for a while and check whether the mark is moved. Then, you can determine whether the drum is working properly. If the toner is not supplied normally or the laser is blocked, the blank paper may be printed. Therefore, check whether the toner is used up, whether the ink cartridges are correctly loaded into the machine, whether the sealing tape has been removed, or whether there is a shelter on the laser irradiation channel. Note that the power supply must be switched off during the check, because the laser beam may damage the operator's eyes.

Ii. blacklist of printed paper output

For dot matrix printers, the cause of the fault is hair removal, excessive ink on the ribbon, dirty Printing Head, poor quality of the ribbon, and the push rod position is adjusted too close. During the overhaul, the push rod position should be adjusted first, if the fault cannot be ruled out, replace the ribbon and clean the print head. Generally, the fault can be ruled out. For inkjet printers, check whether the nozzle is damaged, whether the ink pipe is broken, and whether the ink model is normal; for laser printers, most of them are caused by the failure of the corona discharge wire or the failure of the control circuit, which causes the laser to always launch, resulting in the entire print output. Therefore, check whether the corona discharge wire is disconnected or whether the high-voltage corona is present, and whether the beam detector in the laser beam path works normally.

3. Print incomplete characters or unclear characters

For inkjet printers, there may be two reasons: ink cartridges, printers for a long time, or directly sunlight caused by nozzle blockage. The solution is to change the new ink cartridge or ink injection. If the ink cartridge is not used up, you can determine that the nozzle is blocked: remove the ink cartridge (for the printer where the ink cartridge nozzle is not one, remove the nozzle ), soak the nozzle in warm water for a while. Be sure not to immerse the part of the circuit board in the water; otherwise, the consequences will be unimaginable.

For dot matrix printers, there may be the following reasons: printing ribbons are used for a long time; printing heads are not cleaned for a long time, there are too many dirt; printing heads have broken pins; Printing Head driver circuit is faulty. The solution is to adjust the spacing between the print head and the printing roll first. The fault cannot be ruled out. You can change the color band to a new one. If not, you need to clean the print head. The method is: remove the two fixed screws on the print head, take down the Print Head, use a needle or a small hook to clear the dirt before and after the Print Head, usually long accumulation of ribbon fiber, etc, then, you can see a few drops of oil in the position of the needle at the back of the print head to clear some dirt, leave the ribbon empty and put a few sheets of paper, and then attach the ribbon, so that the problem can be basically solved, if it is a problem with the print head or drive circuit, you can only replace the print needle or drive tube.

4. Weak print handwriting

For dot matrix printers, most of the causes of this kind of failure are ribbon ink drying, print head broken needle, Push Rod Position adjusted too far, you can replace the ribbon and adjust the push rod method to solve; for ink jet printers, nozzle blockage, dry ink, incorrect ink model, air in the ink pipe, printer operating temperature is too high will cause this fault, the nozzle, ink box, etc. for inspection and repair; for laser printers, when there are few toner in the toner cartridge, the development voltage of the display roller is low, and the photosensitive effect of the toner is poor, it also causes the printing handwriting to fade. At this time, the toner cartridge is gently shaken. If the printing effect is not improved, replace the toner cartridge or adjust a set of photosensitive switches under the toner cartridge to match the sensitivity of the toner cartridge.

5. When printing, the handwriting is clear while the other side is unclear.

This phenomenon usually occurs on the dot matrix printer, and may also occur on the inkjet printer, but the probability is small, mainly because the guide rails of the print head are not parallel to the printing roller, resulting in a close distance between the two. The solution is to adjust the gap between the guide rails and the printing roller to make them parallel. The specific method is: loosen the regulator on both sides of the print head guide, rotate the regulator in a counter-clockwise manner to reduce the gap, and finally adjust the Guide Rail and the print roll to parallel to solve the problem. However, you need to adjust the direction when you adjust it. you can adjust it gradually and print it several times more.