Xerox FaxCentre F12, Service Manual

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Circuit Description
WorkCentre Pro 412, FaxCentre F12 & 3/03 5-61
WorkCentre M15/M15i
This process transfers the (-)toner on the transfer roller to the printing paper by the transfer roller. The (-
)toner attached to the OPC drum will be energized to hundreds to thousands of the (+)transfer voltage by
HVPS. The (+)electrostatic force of the transfer roller generated has higher adhesiveness than the (-)toner
OPC drum and thus it moves to the surface of the paper passing through the transfer roller.
The toner transferred to the paper with weak electrostatic force is fixed to the paper by the pressure and
heat of the fixer composed of pressure roller and heat roller.
The toner attached to the paper is melted by applying the heat (approximately 180°C) from the heat roller
and the pressure (approximately 4kg) from the pressure roller. After the fixing process, the paper is sent
out of the set to finish the printing process.
5-7-7-3. Organization of the Device
HVPS is comprised of electrification output unit, bias output unit and transfer output unit.
1) Input Unit.
2) Electrification Output (Enable) Unit: MHV (Main High Voltage).
3) Bias Output (Enable) Unit: DEV (Development Voltage)/Supply (Supply Voltage)/BLADE (Blade
Voltage).
4) Transfer ‘+’ Output (Enable) Unit: THV (+) (Transfer High V)).
5) Transfer ‘-’ Output (Enable) Unit: THV (-) (Transfer High Voltage(-)).
6) Switching Unit.
7) Feedback Unit.
8) Regulation Unit.
9) Output Unit.
Electrification Unit Block-Diagram
Transfer Output Unit Block Diagram