Chapter 8
8-20
8.4.3 ETB Cleaning
0019-8978
The ETB is used not only to transfer the toner on the photosensitive drum to the paper but also to write a pattern image for correction for image stabilization control.
If the toner which is not transferred to the paper remains on the ETB, it causes stain on the back of paper.
In this control, the ETB surface is cleaned by placing the residual toner on the ETB back to the photosensitive drum electrostatically.
The ETB cleaning is executed by the DC controller at the following timing.
- At power-on
- Before and after the execution of color displacement corrective control
- Before and after the execution of image gradation corrective control
- When the front cover is closed
- After printing is performed when the universal-size paper is specified
Negative charged toner and positive charged toner remain on the ETB.
When ETB cleaning starts, the DC controller sets the potential of the photosensitive drums for magenta (M) and yellow (Y) to 0, using the bias of the primary
charging roller. The photosensitive drums for cyan (C) and black (Bk) are changed negative.
For the transfer roller for each color, a positive or negative DC bias is applied as shown in the figure below.
Since potential difference occurs between each photosensitive drum and ETB, the residual toner is reverse-transferred to the photosensitive drum. The negative
charged toner is adhered to the photosensitive drums for magenta (M) and yellow (Y), and the positive charged toner is adhered to the photosensitive drums for
cyan (C) and black (Bk).
The toner adhered to the photosensitive drum is scraped by the cleaner blade and collected into the waste toner container.
F-8-26
Negative potential waste toner
Positive potential waste toner
M toner cartridge
C toner cartridge
Y toner cartridge
Bk toner cartridge
DC negative bias
DC positive bias
DC negative bias
DC
Summary of Contents for iR C1020 Series
Page 1: ...Sep 8 2008 Service Manual iR C1020 Series iR C1021i ...
Page 2: ......
Page 6: ......
Page 18: ...Contents ...
Page 19: ...Chapter 1 Introduction ...
Page 20: ......
Page 22: ......
Page 57: ...Chapter 2 Installation ...
Page 58: ......
Page 60: ......
Page 73: ...Chapter 3 Basic Operation ...
Page 74: ......
Page 76: ......
Page 81: ...Chapter 4 Main Controller ...
Page 82: ......
Page 84: ......
Page 97: ...Chapter 5 Original Exposure System ...
Page 98: ......
Page 100: ......
Page 112: ......
Page 113: ...Chapter 6 Original Feeding System ...
Page 114: ......
Page 116: ......
Page 132: ......
Page 133: ...Chapter 7 Laser Exposure ...
Page 134: ......
Page 136: ......
Page 143: ...Chapter 8 Image Formation ...
Page 144: ......
Page 146: ......
Page 180: ......
Page 181: ...Chapter 9 Pickup and Feed System ...
Page 182: ......
Page 213: ...Chapter 9 9 29 F 9 79 1 2 3 ...
Page 214: ......
Page 215: ...Chapter 10 Fixing System ...
Page 216: ......
Page 218: ......
Page 233: ...Chapter 11 External and Controls ...
Page 234: ......
Page 263: ...Chapter 12 e maintenance imageWARE Remote ...
Page 264: ......
Page 266: ......
Page 275: ...Chapter 12 12 9 F 12 27 ...
Page 280: ......
Page 281: ...Chapter 13 Maintenance and Inspection ...
Page 282: ......
Page 284: ......
Page 286: ......
Page 287: ...Chapter 14 Measurement and Adjustments ...
Page 288: ......
Page 290: ......
Page 293: ...Chapter 15 Correcting Faulty Images ...
Page 294: ......
Page 296: ......
Page 317: ...Chapter 16 Error Code ...
Page 318: ......
Page 320: ......
Page 331: ...Chapter 16 16 11 ...
Page 332: ......
Page 333: ...Chapter 17 Special Management Mode ...
Page 334: ......
Page 336: ......
Page 343: ...Chapter 17 17 7 ...
Page 344: ......
Page 345: ...Chapter 18 Service Mode ...
Page 346: ......
Page 348: ......
Page 388: ......
Page 389: ...Chapter 19 Upgrading ...
Page 390: ......
Page 392: ......
Page 396: ...Chapter 19 19 4 3 Click Next F 19 4 4 Select a USB connected device and click Next F 19 5 ...
Page 397: ...Chapter 19 19 5 5 Click Start F 19 6 6 Click Yes F 19 7 Download will be started F 19 8 ...
Page 399: ...Chapter 19 19 7 ...
Page 400: ......
Page 401: ...Chapter 20 Service Tools ...
Page 402: ......
Page 404: ......
Page 407: ...Sep 8 2008 ...
Page 408: ......