Analysis of common faults of the hottest laser pri

2022-08-06
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Analysis of common faults in laser printing

fault (III) output horizontal irregular black belt (line)

possible fault causes:

(1) poor contact of photosensitive drum electrode

(2) the shear force of the photosensitive drum scraper is too large

(3) jitter occurs when the main gear of the photosensitive drum rotates

(4) the photosensitive drum is defective or improperly installed

general maintenance methods:

(1) first check whether the de energizing contact of the photosensitive drum is in good contact, the lattice on the surface of the photosensitive drum is connected with the conductive base after exposure, and the charge is released to the ground through the conductive base of the photosensitive drum and the de energizing brush. For example, the eliminator brush of HP 4L and 4P photosensitive drums uses the method of friction between the eliminator brush and the inner wall of the conductive base cylinder. After a certain period of time, the inner wall of the photosensitive drum is ground into two deep grooves (double electric shock) by the eliminator brush, which will cause poor contact between the contact and the conductive base of the photosensitive drum. The maintenance method is to change the original friction track of the contact, and then apply conductive grease to increase the conductivity

(2) check whether the photosensitive drum scraper is lubricated (whether the shear force is too large). There is a shearing angle between the cleaning scraper and the photosensitive drum, which has a great shearing force on the photosensitive drum. In order to have a good cleaning ability between the photosensitive drum and the scraper, and also to have a good lubrication without damaging the photosensitive drum, a layer of lubricating powder is also coated on the part of the scraper blade in the clamping mode of different tensile testing machine fixtures

resin transfer molding (RTM) is a kind of composite material manufacturing process. When the friction of the lubricating powder disappears or the lubricating powder is wiped off after long-term use, the scraper will form a great shear resistance to the photosensitive drum, which will make the photosensitive drum not run smoothly and cause jitter (this usually occurs on the regenerated selenium drum), which will make the photosensitive drum not run smoothly and cause failure. Therefore, special attention should be paid to not removing the lubricating powder from the scraper when cleaning or replacing the photosensitive drum. To eliminate this fault, only replace the scraper

(3) at present, there are many transmission gears in the printer. After the printer has been used for a certain period of time, there is often a problem of no lubrication and excessive wear between the transmission gears, resulting in excessive meshing clearance between the gears, resulting in unstable transmission and shaking, which is also an important reason for the horizontal black line fault. At this time, it is necessary to adjust the main drive gear engaged by the photosensitive drum first, and add some lubricating paste or oil on the gear appropriately. If the wear is severe and cannot be adjusted, the main drive gear engaged by the printer and the photosensitive drum should be replaced to eliminate the fault

(4) another reason for horizontal black lines is that the photosensitive drum is defective or incorrectly installed. When the photosensitive drum is defective, most of the horizontal black lines or stains on the printed page are regular. At this time, the selenium drum can be taken out for careful inspection. If there is a problem with the photosensitive drum, the photosensitive drum should be replaced. If there is no problem with the photosensitive drum, it may be caused by the incorrect installation of the photosensitive drum. When the photosensitive drum is installed incorrectly, it will cause abnormal contact with the printing paper, uneven printing and black stripes. At this time, open the cover of the printer box, take out the photosensitive drum, and reinstall it correctly

(to be continued)

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