Savin SDC103A Manuel de service télécharger pdf (Page 71)

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101

This machine uses two control methods:

•

Latent Image Control (every process control self check)

•

Toner Supply Control (every copy)

Latent Image Control

Latent image control controls the development potential to maintain the

density of the toner image on the drum. It does this by compensating for

variations in drum chargeability and toner chargeability.

The machine uses the drum potential sensor to measure the drum’s

response to a standard applied voltage. Then it uses the image density (ID)

sensor to measure drum reflectivity and the density of a standard sensor

pattern. These tests are done during the process control self check, which is

done every 150 copies and at other times such as after replacing the

developer.

Depending on the results of the self check, the machine adjusts the grid

voltage, the development bias, and the laser diode current to maintain the

correct drum potentials.

Toner Supply Control

Toner supply control maintains a constant amount of toner on the ID sensor

pattern. To do this, the machine monitors the response of the ID sensor to a

standard pattern printed for each color after every color development cycle

and uses this to control the toner supply motor with a fuzzy logic algorithm.

Rev. 1/97

PROCESS CONTROL

A166/A187/A189 2-2 SM

CÓPIA NÃO CONTROLADA

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Savin SDC103A Manuel de service Page 71

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