Canon IR3300, IR2800, IR2200 manual Controlling the Developing Bias, F04-702-01

CHAPTER 4 IMAGE FORMATION SYSTEM

7.2 Controlling the Developing Bias

7.2.1 Outline

Both DC bias and AC bias are applied to the developing cylinder. The output is controlled by the composite power supply PCB based on the control signal from the DC controller PCB.

The following relate to the developing bias control system:

[1]Controlling the DC developing bias to a specific voltage level

[2]Controlling the AC developing bias to a specific voltage level

Composite power supply PCB

				+24V					Developing
	24 VDC input from								cylinder
	main power supply J135
						High-voltage
	J301	DC bias	J136			main
						transformer			Photosensitive
	-B1	ON signal	-B12		Transformer	(for DC)
									drum
					drive signal
		AC pulse				Output		Voltage	J130-1
	-B4	ON signal	-B9			control		detection
controller PCB				PW-CPU	DC bias control signal
		Serial				Voltage level
		communication
	DC bias level signal
	J301		J136
DC					Transformer
	-A3		-A10			Developing
					drive signal		AC bias
	-A1		-A12			high-voltage
						transformer
						(for AC)
	J301	AC bias	J136
	-B2	ON signal	-B11
						F04-702-01

The AC pulse ON signal is used as the primary charging output enable sig- nal when controlling primary charging.

Memo

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 4-19 P