Brother International HL-2400C Service Manual - Page 57
Transfer Drum
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1.1.2 Basic Structure of the Printing System A toner image is formed through the potential of the OPC belt varying in each of the charger, exposure, development, transfer and cleaning processes. (1) Process of Print System (See Fig.4-9.) i) The OPC belt is biased to the voltage -CBV(V) by the power supply CBV. ii) A negative high voltage is applied to the charger unit by the power supply CHV, and a corona is generated as the result. iii) The developer magnetic roller of the toner cartridges is biased to -DBV(V) by the power supply DBV. iv) The frame potential of the transfer drum is GND. Fuser Unit Cleaning Unit FCBV Cleaning Burush OPC Belt Paper Discharger Transfer Drum Toner Toner Cartridge K Develop Y ACHV Transfer Roller THV (+) THV ( - ) Paper Cleaning Blade Erase Lamp M C Charger CHV DBV CBV Scannerl Unit Po ZDV Fig.4-9 No. Function 1 Charging 2 First Transfer 3 Developing Y,M Bias C,K 4 Second Transfer 5 Transfer Roller Cleaning 6 Paper Discharging 7 Drum Cleaning Power Supply (P/S) P/S Name Approx.Output Voltage CHV(-) 4.6KV HVRD6190 619V CBV(-) 200V ∼ 900V DBV(-A) 200V ∼ 400V DBV(-B) 200V ∼ 400V THV(+) 400V ∼ 3,000V THV(-) 600V ACV(∼) 4.9KV DCV(+) 200V FCBV 200V ∼ 1,500V IV-8