High-Voltage Control; Overview; Generating Primary Charging Bias; Generating Developing Bias - Canon LBP3010 Series Service Manual

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Service manual (146 pages)

Table of Contents

Chapter 2

2.4.2 High-Voltage Control

2.4.2.1 Overview

LBP3100 / LBP3010B

This circuit is comprised of the circuits that apply biases to the primary charging roller, developing cylinder, transfer roller, and the fixing control circuit. The CPU

of the engine controller controls the high-voltage power supply circuit to generate these biases. The fixing control circuit executes heater control of the fixing as-

sembly according to the instruction by the CPU of the engine controller.

The following is the block diagram of this circuit.

Engine controller

CPU

2.4.2.2 Generating Primary Charging Bias

LBP3100 / LBP3010B

The primary charging bias (PRI) is a DC negative bias that is output to apply an even negative potential to the surface of the photosensitive drum. The primary

charging high-voltage generating circuit in the high-voltage power supply circuit generates this bias.

The high-voltage power supply circuit applies the generated primary charging bias to the primary charging roller at a specified timing.

The primary charging bias varies in conjunction with the developing bias according to the information of image density sent from the main controller.

2.4.2.3 Generating Developing Bias

LBP3100 / LBP3010B

The developing bias is a DC negative bias that is output to affix toner to the static latent images formed on the photosensitive drum. This bias is a development DC

and AC superimposed bias and generated by the development high-voltage generating circuit in the high-voltage power supply circuit.

The high-voltage power supply circuit applies the generated developing bias to the developing cylinder at a specified timing.

The developing bias varies in conjunction with the primary charging bias according to the information of image density sent from the main controller.

2-10

Cleaning blade

Cleaner container

F-2-14

High-voltage power supply

Primary

charging

high-voltage

generation