The ITB unit consists of the transfer cleaning unit, the transfer belt and four ITB rollers facing each drum. When printing the color image, the toner image with a single color formed on each drum is repeatedly transferred on the transfer belt by impressing the bias to the ITB rollers facing each drum, and then the full color toner image is formed. Also, the ID sensor (PCB6/PCB7) attached to the main unit measures the toner density on the transfer belt.
The transfer cleaning unit collects the remaining toner on the transfer belt after the paper transfer, and forwards it to the waste toner bottle as waste toner.
| No. | NameNName | No.A | Name |
|---|---|---|---|
| 1 | Tension roller | 8 | Cleaning fur brush |
| 2 | Drive roller | 9 | Cleaning roller |
| 3 | ITB roller K | 10 | Cleaning blade |
| 4 | ITB roller M | 11 | Cleaning screw |
| 5 | ITB roller C | 12 | ID sensor 1 (PCB6) |
| 6 | ITB roller Y | 13 | ID sensor 2 (PCB7) |
| 7 | Transfer belt |