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II-28
2.4
Drum Unit
2.4.1
Photosensitive Drum
Generates the latent electrostatic image and develops the image on the drum
surface.
2.4.2
Primary Charger
Forms a uniform charge on the drum surface.
(1)
Corona wire
Generates ion on the drum.
(2)
Grid
Spreads the ion evenly over the drum.
2.4.3
Developer Roller
Develops the latent electrostatic image on the drum surface by the toner.
2.4.4
Transfer Roller
Transfers the toner image to the paper from the drum surface.
2.4.5
Cleaner Roller
Removes and exhausts the toner remaining on the drum surface.
2.4.6
Erase lamp
Discharges the electrostatic latent image on the drum.
2.5
Print Process
2.5.1
Charging
The drum is charged to approx. +1000V by ion which is generated by the primary
charger. Ion is generated by an ionization of the corona wire, which applied DC
bias from High-voltage Power Supply. The flow of ion is controlled by the grid to
be distributed evenly on the drum surface. The other end of the grid is generated to
approx. 280V by the voltage regulator.
+
+
+
+
+
+ + + +
+
+
+
+
+
+
+
+
+ +
+
+
-
-
-
--
-- - - - -
Fig. 2.31
The primary charge uses a corona wire, but since the charging terminal of the
drum is a positive terminal , only less than 1/10 of the usual quantity of ozone is
generated. The level of ozone expelled from the printer is therefore not harmful to
the human body. Applicable safety standards have been complied with.
Aluminum pipe
Organic Photoconductor layer
Drum
Passive Type
Voltage Regulator
Voltage
Regulator
Corona wire
1000V
280V
Grid
HVPS
Содержание HL-720
Страница 1: ...SERVICE MANUAL MODEL HL 720 730 730Plus R LASER PRINTER ...
Страница 36: ...II 19 1 3 10 Engine I O HL 720 Fig 2 21 shows the engine interface circuit Fig 2 21 ...
Страница 37: ...II 20 HL 730 730Plus Fig 2 22 shows the engine interface circuit Fig 2 22 ...
Страница 61: ... Fig 3 18 2 4 1 1 1 ...
Страница 92: ...SERVICE MANUAL MODEL HL 760 R LASER PRINTER ...
Страница 109: ...II 8 1 3 4 DRAM Two 4M bit DRAMs x 16bits are used as the RAM Fig 2 6 ...
Страница 113: ...II 12 1 3 10 Engine I O Fig 2 12 shows the engine interface circuit Fig 2 12 ...
Страница 114: ...II 13 1 3 11 Paper Feed Motor Drive Circuit Fig 2 13 ...
Страница 133: ...Appendix 2 Main PCB Circuit Diagram 1 3 CODE UK3227000 B48K272CIR 1 3 NAME ...
Страница 134: ...Appendix 3 Main PCB Circuit Diagram 2 3 CODE UK3227000 B48K272CIR 2 3 NAME ...
Страница 135: ...CODE UK3227000 B48K272CIR 3 3 NAME Appendix 4 Main PCB Circuit Diagram 3 3 ...