What are the manifestations of photosensitive drum damage in copiers

What are the manifestations of photosensitive drum damage in photocopiers During long-term use, photosensitive drums will be damaged by external forces due to damage to internal parts of the copier or external impurities, and internal aging will occur due to repeated charging and discharging. These causes form a sensory drumhead lesion - once formed, with a certain stability that can recur in these copies in the same form over a considerable period of time, and we provide a clause that allows us to identify the same - Copier parts.

The damage characteristics of the above photosensitive drum are as follows:
(1) Scratches. It is caused by friction with the surrounding parts during rotation, and the form is fine. The lines reflected on the copy paper are along the paper feeding direction. The thin black lines are not long.

(2) Bump marks. During take-up, installation, maintenance During, the shape is an irregular spot due to the collision of the bow, reflected on the copy paper Regular line mark and dot mark.

(3) Electroporation labeling. It is caused by partial conduction between the electrode wire and the photosensitive drum to form an arc discharge. It is in the form of circular spots that reflect missing printed dots with black dots on copy paper.

(4) Traces of aging. The natural aging damage caused by the long-term use of the photosensitive drum is manifested by the peeling or cracking of the surface of the photosensitive drum, which is difficult to reproduce. It is reflected on the paper as irregular black defects or large-area fine short-line openings.

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