Savin SDC103A Service Manual download pdf (Page 44)

100

101

MACHINE CONFIGURATION

2.1 COPY PROCESSES AROUND THE DRUM AND BELT

1. Drum Charge

In the dark, the charge corona unit gives a negative charge to the

organic photoconductive (OPC) drum. The grid plate ensures that corona

charge is applied uniformly. The charge remains on the surface of the

drum because the OPC layer has a high electrical resistance in the dark.

The amount of negative charge on the drum is proportional to the

negative voltage applied to the drum charge corona wire and casing.

2. Laser Exposure

A laser beam is reflected onto the drum by the polygon and drum

mirrors. This forms an electrical latent image on the drum surface. The

amount of charge remaining as a latent image on the drum depends on

the laser beam intensity.

3. Drum Potential Detection

The drum potential sensor detects the strength of the electric field on the

charged drum. The sensor output is one of the signals used in process

control.

Overall

Machine

Information

MACHINE CONFIGURATION

SM 1-11 A166/A187/A189

CÓPIA NÃO CONTROLADA

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Savin SDC103A Service Manual Page 44

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