To prevent soiling of the back of print paper, the machine applies a negative bias (TR2 signal) to the secondary transfer outside roller, thus creating a potential

between ITB and roller; as a result, the negatively charged residual toner and the secondary transfer outside roller is drawn back to the ITB, where it is scraped off

by the cleaning blade for collection in the ITB cleaning unit.

MEMO:

This is a cleaning sequence using toner. The amount of toner used in one sequence is equivalent to that required to print 40 sheets of A4 at 5% image ratio.

7.7.1.4 Secondary Transfer Block

/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880

The secondary transfer block uses the drum/ITB motor (M1) as the source of drive to operate the secondary transfer roller. (M1 is controlled by the DC controller.)

[1] Secondary transfer outside roller

[2] Drum/ITB motor drive signal

M1: drum/ITB motor

7.8 Waste Toner Collection Mechanism

7.8.1 Collecting the Waste Toner

/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880

The machine collects waste toner discharged from the 2 types of cleaning units (ITB cleaning unit, drum cleaning units of individual colors) for collection in the

waste toner case.

When the power is turned on or for each print job, the DC controller drives the waste toner transport motor (M12) to rotate the feedscrew inside the waste toner

pipe, thereby moving the waste toner.

The waste toner pipe is connected to the discharge outlet of the cleaning unit. When M12 goes on, the waste toner collecting at the discharge outlets is moved

through the waste toner pipe for collection in the waste toner case.

M12

[1] ITB cleaning unit

[2] Waste toner discharge outlet

[3] Drum cleaning unit

[4] Waste toner discharge outlet

[1]

[2]

[9]

D-CON

F-7-49

D-CON