Canon LBP-2000 Service Manual download pdf (Page 57)

CHAPTER 2

2 - 18

D. High-Voltage Power Supply Circuit

1. Outline

DC controller PCB

Video

controller PCB

CPU

ASIC

Primary

bias circuit

Developing

bias circuit

Toner level

detection circuit

Transfer

bias circuit

/PRNT

-20

TB401/TB402

Ant

TB403/TB404

TB405/TB406

T403

J104

-20

High-voltage power

supply PCB

Figure 2-2-7

The high-voltage power supply circuit is mounted on the DC controller PCB, and is used to apply

a voltage (generated by combining DC and AC voltages) to the primary charging roller and the

developing cylinder in response to commands from the CPU and according to the print signal (/

PRNT) from the video controller PCB; it applies a positive or negative DC voltage to the transfer

charging roller.

It also varies the primary DC bias and the developing DC bias to adjust the image density based

on the image density data from the video controller PCB.

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Canon LBP-2000 Service Manual Page 57