II-31
2.5.5
Drum Cleaning Stage
In the image transfer stage, not all the toner on the photosensitive drum is
transferred onto the paper but some of them remain on the drum. In the drum
cleaning stage, the drum surface is cleaned by the cleaning roller, so that residual
toner on the drum surface is removed away and collected in the cleaning roller
itself. The residual toner in the cleaning roller will be discharged to the drum when
starting or unprinting the toner will be collected by a developing roller and reused
(for further developing).
2.5.6
Erasing Stage
Before the cleaning stage, the drum surface is exposed by the light emitted from
the erase lamp. (LED lamp) This stage prepares the drum to decrease
its surface voltage uniformly, and to receive an uniform change in the primary
changing stage.
Summary of Contents for HL-720
Page 1: ...SERVICE MANUAL MODEL HL 720 730 730Plus R LASER PRINTER ...
Page 36: ...II 19 1 3 10 Engine I O HL 720 Fig 2 21 shows the engine interface circuit Fig 2 21 ...
Page 37: ...II 20 HL 730 730Plus Fig 2 22 shows the engine interface circuit Fig 2 22 ...
Page 61: ... Fig 3 18 2 4 1 1 1 ...
Page 92: ...SERVICE MANUAL MODEL HL 760 R LASER PRINTER ...
Page 109: ...II 8 1 3 4 DRAM Two 4M bit DRAMs x 16bits are used as the RAM Fig 2 6 ...
Page 113: ...II 12 1 3 10 Engine I O Fig 2 12 shows the engine interface circuit Fig 2 12 ...
Page 114: ...II 13 1 3 11 Paper Feed Motor Drive Circuit Fig 2 13 ...
Page 133: ...Appendix 2 Main PCB Circuit Diagram 1 3 CODE UK3227000 B48K272CIR 1 3 NAME ...
Page 134: ...Appendix 3 Main PCB Circuit Diagram 2 3 CODE UK3227000 B48K272CIR 2 3 NAME ...
Page 135: ...CODE UK3227000 B48K272CIR 3 3 NAME Appendix 4 Main PCB Circuit Diagram 3 3 ...
