Lexmark 500n First transfer drum process, Transfer belt Aluminum drum tube Film transfer belt

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3.Developing is processed by toner adhering to the OPC belt due to the attraction between the toner and the -VR(V) charge at the exposed area of OPC belt. The toner image becomes visible on the OPC belt.

Note: No developing takes place on the non-exposed area because the potential of toner and that of the non-exposed area of the OPC belt is an identical pole and therefore, repels.

First transfer (drum) process

The first transfer process consists of toner images on the OPC belt being transferred to the transfer belt. The transfer belt is composed of a special rubber. See “Printer theory of operation” on page 1-14for transfer belt location.

1.After the development process, the OPC belt rotates making contact and synchronizing with the transfer belt and the aluminum drum.

Transfer belt

Aluminum drum tube

Aluminum drum tube

Film (transfer belt)

2.The OPC belt has been biased to -CBV(V) potential. The potential of the transfer belt and drum is nearly GND.

3.Toner on the OPC belt is moved to the transfer belt. This occurs because of the difference of potential between the OPC belt and the transfer belt. Toner that has been developed, in each color, is moved from the OPC belt to the transfer belt and the two color toner image is overlapped on the transfer belt.

1-26Service Manual