Secondary Transfer Block - Canon Color iR C3480 Service Manual

[1] ITB cleaning blade
[2] Bk halftone pattern
1. Particulars of Operation
1) The machine forms a Bk halftone pattern on the ITB over the length of the belt.
2) The machine executes ITB idle rotation. (about 45 sec)
As a result, the ITB cleaning blade removes the Bk band together with the fingerprints from the ITB. (The waste toner is collected in the cleaning unit.)
3) The machine repeats the foregoing steps (1 and 2) 3times.
4) The machine executes secondary transfer outside roller cleaning (Notes).
It takes about 180 seconds for all of the operations described above to be completed.
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

Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iR
C2550
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]
ITB
Laser Scanner Unit
F-7-48
[2]
HVT2
D-CON
M-CON
Chapter 7
0013-8509
7-41