Toshiba E-Studio 5540c - Electric Circuit Description; Drum Surface Potential Sensor Control Circuit; Configuration

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OUTLINE OF THE MACHINE
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3.12.4 Electric Circuit Description
[ 1 ] Drum Surface Potential Sensor Control Circuit
[ 1-1 ] General description
The drum surface potential sensor measures the surface potential of the drum when the drum is
charged. Based on the measured value, this sensor controls the main charger grid bias voltage, and
thus can control the drum surface potential accurately.
[ 1-2 ] Configuration
The configuration of this control circuit is shown below.
• Drum surface potential sensor:
Measures the drum surface potential.
• Drum surface potential sensor shutter:
This shutter prevents toner and developer material from adhering to the drum surface potential
sensor.
• Control section (LGC board):
Calculates the main charger grid bias voltage to be applied when the image quality control is
performed, then controls the high-voltage transformer to adjust its bias voltage output.
• High-voltage transformer:
Generates and supplies the bias voltage of the main charger grid.