Dell 5110cn Color Laser Printer Service Manual - Page 535

Chapter 6 Principles of Operation 1.3.12 Cleaning (general) In the cleaning (general) process, toner stored in the IDT 1 cleaner and IDT 2 cleaner after the finished toner image is transferred onto the paper and the toner remaining on the BTR are removed. - The toner not completely transferred in the "secondary transfer" and "tertiary transfer" processes is held temporarily in the IDT1 Cleaner and IDT2 Cleaner. Also, the toner of which polarity is reversed and returned to the drum is held in the Refresher. Further, the toner that passes the Refresher may stick to the RTC. These toners are cleaned at the completion of the printing. The recovery method is different between the toner held in the IDT1 Cleaner and IDT2 Cleaner and the toner held in the Refresher and RTC. (1) IDT1 Cleaner and IDT2 Cleaner High voltage equivalent to the voltage at the printing transfer is applied to the IDT1, IDT2, and BTR. The toner (negative polarity) remaining in the IDT1 Cleaner and IDT2 Cleaner are moved to the IDT1 and IDT2 electrically by transforming the IDT1 Cleaner and IDT2 Cleaner to 0V. Then, in the same manner as in the printing transfer, the residual toner is collected to the BTR surface by potential difference between IDT1, IDT2, and BTR. HVPS + + IDT1 + + + : Positive electric charge + : Toner + + + + ++ IDT2 IDT2 Cleaner + + IDT1 Cleaner + + + IDT1 + + + + + + + + HVPS + + + + + BTR + + Urethane HVPS blade IDT1 Cleaner BTR Voltage > IDT2 Voltage > IDT1 Voltage Ida_Sec06_019FA 6 - 16