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II -
8
3.2.2
Developing stage
Development places particles of toner onto the areas of the drum that have been cleared of
charge by the laser beam. This makes a visible image. This printer uses the toner projection
development method with a single-component toner.
Blade
Stirrer
Developing cylinder
Cylinder
Magnet
DC bias
AC bias
Photo-
sensitive
drum
Figure 2.11
Note: The charges on the light areas on the photosensitive drum are shown as positive in this
figure. Actually they are negative, but they are more positive than the developing
cylinder and explanation is simplified by regarding them as positive.
As shown in Figure 2.11, the developing unit consists of a developing cylinder and rubber blade.
The developing cylinder rotates around a fixed internal magnet. The single-component toner
consists of magnetite and a resin binder, and is held to the cylinder by magnetic attraction. The
toner is an insulator, and acquires a negative charge by friction due to the rotation of the cylinder.
The areas on the drum that were exposed to the laser beam have a higher potential (are less
negative) than the negatively charged toner particles on the developing cylinder. When these
areas approach the cylinder, the potential difference projects the toner particles onto them. This
is called toner projection, and the latent image on the drum becomes visible.
Developing cylinder
surface potential
Drum surface
potential
(exposed area)
DC bias
Drum surface
potential
(unexposed area)
Time t
+V
0
-V
Voltage (V)
Figure 2.12
An AC bias is applied to the developing cylinder to help project the toner particles to the drum
surface and improve the contrast of the printed image. The center voltage of the AC bias (1600
Vp-p) varies with the DC bias voltage.
The IMAGE DENSITY ADJUSTMENT signal (sent from the Engine CPU to the high-voltage
power supply) changes the DC bias, and thus the potential difference between the cylinder and
drum. This changes the density of the print.
This printer has a stirring mechanism to supply toner in the cartridge smoothly to the cylinder.
Step 3
Development
Содержание HL-1260
Страница 1: ...SERVICE MANUAL MODEL HL 1260 R LASER PRINTER ...
Страница 40: ...III 8 K D E F A C 2 C 3 C C 1 J B G 2 G 1 G H I Figure 3 6 Main PCB Circuit ...
Страница 108: ...Appendix 2 Paper Feed Size SW PCB Circuitry Diagram 1 1 A 2 CODE NAME UK2516000 B48K139 140CIR JW 27 95 P053 ...
Страница 109: ...Appendix 3 Main PCB Circuitry Diagram 1 8 A 3 CODE NAME UK2495000 B48K158 159CIR 1 8 ...
Страница 110: ...Appendix 4 Main PCB Circuitry Diagram 2 8 A 4 CODE NAME UK2495000 B48K158 159CIR 2 8 ...
Страница 111: ...Appendix 5 Main PCB Circuitry Diagram 3 8 A 5 CODE NAME UK2495000 B48K158 159CIR 3 8 ...
Страница 112: ...Appendix 6 Main PCB Circuitry Diagram 4 8 A 6 CODE NAME UK2495000 B48K158 159CIR 4 8 ...
Страница 113: ...Appendix 7 Main PCB Circuitry Diagram 5 8 A 7 CODE NAME UK2495000 B48K158 159CIR 5 8 ...
Страница 114: ...Appendix 8 Main PCB Circuitry Diagram 6 8 A 8 CODE NAME UK2495000 B48K158 159CIR 6 8 ...
Страница 115: ...Appendix 9 Main PCB Circuitry Diagram 7 8 A 9 CODE NAME UK2495000 B48K158 159CIR 7 8 ...
Страница 116: ...Appendix 10 Main PCB Circuitry Diagram 8 8 A 10 CODE NAME UK2495000 B48K158 159CIR 8 8 ...
Страница 117: ...Appendix 11 Control Panel PCB Circuitry Diagram 1 1 A 11 CODE NAME UK2527000 B48K143CIR ...
Страница 118: ...Appendix 12 Scanner LD PCB Circuitry Diagram 1 1 A 12 CODE NAME UK2674000 B48K165CIR ...
Страница 119: ...SERVICE MANUAL MODEL HL 1260e 1660 R LASER PRINTER ...
Страница 144: ...III 7 Figure 3 6 Main PCB Circuit A C 2 C 3 C J K B I H 1 H 2 C 1 H G G 1 G 2 F E D ...
Страница 168: ...CODE UK3268000 B48K259 235CIR 1 7 NAME Appendix 3 Main PCB Circuitry Diagram 1 7 ...
Страница 169: ...CODE UK3268000 B48K259 235CIR 2 7 NAME Appendix 4 Main PCB Circuitry Diagram 2 7 A 3 ...
Страница 170: ...CODE UK3268000 B48K259 235CIR 3 7 NAME Appendix 5 Main PCB Circuitry Diagram 3 7 A 4 ...
Страница 171: ...CODE UK3268000 B48K259 235CIR 4 7 NAME Appendix 6 Main PCB Circuitry Diagram 4 7 A 5 ...
Страница 172: ...CODE UK3268000 B48K259 235CIR 5 7 NAME A 6 Appendix 7 Main PCB Circuitry Diagram 5 7 ...
Страница 173: ...CODE UK3268000 B48K259 235CIR 6 7 NAME Appendix 8 Main PCB Circuitry Diagram 6 7 A 7 ...
Страница 174: ...CODE UK3268000 B48K259 235CIR 7 7 NAME Appendix 9 Main PCB Circuitry Diagram 7 7 A 8 ...
Страница 175: ...CODE UK3253000 B48K253CIR 1 1 NAME Appendix 11 Scanner LD PCB Circuitry Diagram 1 1 A 9 ...
Страница 188: ...PARTS REFERENCE LIST MODEL HL 1260e R LASER PRINTER ...
Страница 213: ...I Brother Laser Printer HL 1260e HL 1660 USER S GUIDE ...
Страница 421: ...APPENDICES Appendix 15 HP LaserJet 4 Mode Roman 8 8U ISO Latin1 0N ISO Latin2 2N ISO Latin5 5N ...
Страница 422: ...USER S GUIDE Appendix 16 PC 8 10U PC 8 D N 11U PC 850 12U PC 852 17U ...
Страница 423: ...APPENDICES Appendix 17 PC 8 Turkish 9T Windows Latin1 19U Windows Latin2 9E Windows Latin5 5T ...
Страница 424: ...USER S GUIDE Appendix 18 Legal 1U Ventura Math 6M Ventura Intl 13J Ventura US 14J ...
Страница 425: ...APPENDICES Appendix 19 PS Math 5M PS Text 10J Math 8 8M Pi Font 15U ...
Страница 426: ...USER S GUIDE Appendix 20 MS Publishing 6J Windows 3 0 9U Desktop 7J MC Text 12J ...
Страница 429: ...APPENDICES Appendix 23 PC 8 PC 8 D N PC 850 PC 852 ...
Страница 430: ...USER S GUIDE Appendix 24 PC 860 PC 863 PC 865 PC 8 Turkish ...
Страница 431: ...APPENDICES Appendix 25 IBM Mode PC 8 PC 8 D N PC 850 PC 852 ...
Страница 432: ...USER S GUIDE Appendix 26 PC 860 PC 863 PC 865 PC 8 Turkish ...
Страница 433: ...APPENDICES Appendix 27 HP GL Mode ANSI ASCII 9825 CHR SET ...
Страница 434: ...USER S GUIDE Appendix 28 FRENCH GERMAN SCANDINAVIAN SPANISH LATIN JIS ASCII ...
Страница 435: ...APPENDICES Appendix 29 ROMAN8 EXT ISO IRV ISO SWEDISH ISO SWEDISH N ...
Страница 436: ...USER S GUIDE Appendix 30 ISO NORWAY 1 ISO GERMAN ISO FRENCH ISO U K ...
Страница 437: ...APPENDICES Appendix 31 ISO ITALIAN ISO SPANISH ISO PORTUGUESE ISO NORWAY 2 ...