Charging Mechanism; Controlling Pre-Exposure Led; Pre-Exposure Led Control; Primary Charging Mechanism - Canon iR6570 series Service Manual

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7.5 Charging Mechanism

The machine is equipped with a pre-exposure LED used to prevent adhesion of excess toner on the photosensitive drum because of residual charges. The

following is an item associated with the pre-exposure LED control system:

1. turning on/off the pre-exposure LED

The following is the signal associated with the mechanism:

[1] Pre-exposure LED control signal; when '0', LED goes on

The following items are associated with the primary charging control system:

1. turning on/off the primary corona current

2. controlling the constant current level of the primary corona current

3. controlling the constant voltage level of the grid bias (fixed to 850 V by a

The following shows the construction of the control system associated with the primary charging control system:

The following signals are associated with the mechanism:

[1] Primary charging leakage detection signal; when '0', if the current is too high or too low

[2] Primary corona current control signal; used to control the primary charging current generated by the high-voltage PCB

[3] High-voltage remote signal; turning on/off the primary charging corona current output

The primary charging wire cleaning mechanism is turned on at the following timing, and the construction of the control system is as shown:

Timing of Cleaning

1. when the wire cleaning mechanism is executed in user mode

PRE_LED_ON* [1]

PRIMARY-LEAK-

HVT-PRIMARY [2]

HVT-REMOTE [3]

Pre-exposure lamp

Primary charging wire

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