Lexmark 5021-0XX - Manual (Page 60)

1-34 Service Manual
5021-0XX
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 1-19 for transfer belt location.
1. After the development process, the OPC belt rotates making
contact and synchronizing with the transfer belt and the
aluminum drum.
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.
Transfer belt
Aluminum drum tube
Aluminum drum tube
Film (transfer belt)