II-32
2.5.3
Developing
Developing causes the toner to be attracted to the electrostatic image on the drum so as
to transform it into a visible image.
The developer consists of a non-magnetic toner. The development roller is made of
conductive rubber and the supply roller (which is also made of conductive sponge) rotate
against each other. The toner is charged and carried from the supply roller to the
development roller. The toner adheres to the development roller and is conveyed to the
drum at an even thickness controlled by the blade. The toner is nipped between the
development roller and the drum and developed onto the latent image on the drum. The
electrostatic field between the drum and the development roller, which is DC-biased from
the high-voltage power supply, creates the electrostatic potential to attract toner particles
from the development roller to the latent image area on the drum surface.
Fig. 2-40
2.5.4
Transfer
(a)
Transfer process
After the drum has been charged and exposed, and has received a developed
image, the toner formed is transferred onto the paper by applying a negative
charge to the back of the paper. The negative charge applied to the paper causes
the positively charged toner to leave the drum, and adhere to the paper. As a
result, the image is visible on the paper.
(b)
Cleaning process of transfer roller
If the toner is not transferred onto the paper perfectly, it is possible that there may
be residual toner on the drum which will adhere to the transfer roller. The transfer
voltage changes to a positive voltage during non-printing rotation of the drum.
Therefore the transfer roller is cleaned by returning the positively charged toner
adhering to the transfer roller onto the photo-conductive drum.
(a) Transfer process [ON]
(b) Cleaning process [ON]
Drum
Erase lamp
(a) Collecting process
(b) Discharging process
Cleaning roller
Development
roller
DC-bias
SR-bias
Supply roller
Develop housing
Auger
Separator
Blade
Transfer roller
Toner
Содержание HL-1020
Страница 1: ......
Страница 36: ...II 20 Fig 2 22 shows the CDCC interface circuit Fig 2 22 HL 1050 ...
Страница 37: ...II 21 1 3 10 Engine I O Fig 2 23 shows the engine interface circuit Fig 2 23 HL 820 1020 1040 ...
Страница 38: ...II 22 Fig 2 24 shows the engine interface circuit Fig 2 24 HL 1050 ...
Страница 67: ...III 18 4 PACKING Fig 3 32 Documents Accessory carton Pad Pad Printer Bag Carton ...
Страница 87: ...IV 20 3 4 Location of Feed Roller Shaft and Grounding Contacts Fig 4 7 Feed shaft roller For feed roller ...
Страница 101: ...CODE UK4007000 B48K312CIR NAME V 5 Appendix 5 Main PCB Circuit Diagram HL 820 1020 1040 1 2 ...
Страница 102: ...Appendix 6 Main PCB Circuit Diagram HL 820 1020 1040 2 2 CODE UK4007000 B48K312CIR NAME A 6 ...
Страница 103: ...Appendix 7 Main PCB Circuit Diagram HL 1050 1 5 CODE UK4041000 B512001CIR NAME A 7 ...
Страница 104: ...Appendix 8 Main PCB Circuit Diagram HL 1050 2 5 CODE UK4041000 B512001CIR NAME A 8 ...
Страница 105: ...Appendix 9 Main PCB Circuit Diagram HL 1050 3 5 CODE UK4041000 B512001CIR NAME A 9 ...
Страница 106: ...Appendix 10 Main PCB Circuit Diagram HL 1050 4 5 CODE UK4041000 B512001CIR NAME A 10 ...
Страница 107: ...Appendix 11 Main PCB Circuit Diagram HL 1050 5 5 CODE UK4041000 B512001CIR NAME A 11 ...
Страница 108: ...Appendix 12 Panel Sensor PCB Circuit Diagram CODE UK4010000 B48K303CIR NAME A 12 ...
Страница 117: ...Apr 98 84U005BE0 PARTS REFERENCE LIST MODEL HL 820 1020 1040 1050 R LASER PRINTER ...
Страница 122: ...1 1 1 MODEL HL 1050 84U 861 101 103 104 84U 862 106 6 4 5 MAIN PCB HL 1050 OTHERS ISRAEL 3 ...
Страница 133: ...R Lower Tray Unit for HL 2400C Color Laser Printer PARTS REFERENCE LIST MODEL LT 24CL Feb 1999 54S003BE0 ...
Страница 135: ...CONTENTS LOWER TRAY UNIT List 1 Drawing 2 ...
Страница 137: ... 2 GENERAL DRAWING MODEL LT 24CL 54S X06 4 3 1 6 5 2 7 ...
Страница 138: ...R Lower Tray Unit for HL 2400C Color Laser Printer SERVICE MANUAL MODEL LT 24CL Feb 1999 54S004BE0 ...
Страница 214: ......
Страница 296: ...USER S GUIDE A 12 HP LaserJet IIP 6P EPSON FX 850 IBM Propritner XL EPSON FX 850 ...