Exposure System, Image Formation System

CHAPTER 3 EXPOSURE SYSTEM

I.	BASIC OPERATION		3-1	IV. DISASSEMBLY AND ASSEMBLY		3-9
	A. Varying the Reproduction Ratio ....		3-1	A. Scanner Drive Assembly		3-9
II.	LENS DRIVE SYSTEM		3-1	1.	Detaching the Scanner Drive
	A. Outline		3-1		Motor	3-9
	B. Lens Motor Drive Circuit		3-3	2.	Detaching the Scanner Cable ..	3-10
	1.	Keeping the Lens Motor		3.	Assembling the Mirror
		Stationary	3-3		Position Tool	3-12
	2.	Driving the Lens Motor	3-3	4.	Routing the Scanner Cable	3-13
	C. Basic Sequence of Operations			5.	Adjusting the Position of the
	(lens drive system; non-Direct)		3-4		Mirrors (optical length of No.
III.	SCANNING DRIVE SYSTEM		3-5		1, 2, and 3 mirrors)	3-16
	A. Driving the Scanner		3-5	6.	Cleaning the Scanner No. 6
	1.	Outline	3-5		Mirror	3-17
	2.	Relationship between the		B. Lens Drive Assembly		3-18
		Scanner Sensor and Signals....	3-6	1.	Detaching the Lens Drive
	3.	Basic Sequence of			Motor	3-18
		Operations (scanner)	3-6	2.	Routing the Lens Cable	3-20
	4.	Driving the Scanner Motor	3-7	3.	Adjusting the Position of the
	5.	Scanner Operations in Page			Change Solenoid	3-21
		Separation Mode (non-AE,
		page separation, A4, 2 copies)..	3-8

I.	PROCESSES		4-1	3.	Controlling the Primary
	A. Outline		4-1		Charging Roller Bias to a
	B. Basic Sequence of Operations				Constant Voltage	4-11
	(image formation system)		4-3	4.	Switching the Primary Charging
	C. Controlling the Scanning Lamp		4-4		Roller Bias Application Voltage
	1.	Outline	4-4		Level	4-11
	2.	Turning On and Off the		5.	Application Voltage Level
		Scanning Lamp	4-5		(APVC) for the Primary
	3.	Pre-Heating Control			Charging Roller and Scanning
		(scanning lamp)	4-5		Lamp On Voltage Level
	4.	Sequence of Operations			Automatic Correction	4-12
		(scanning lamp pre-heating		E. Controlling the Transfer Roller Bias...		4-13
		control; AE, A4, continuous,		1.	Outline	4-13
		2 copies)	4-5	2.	Turning On and Off the
	5.	Controlling the Intensity of the			Transfer Roller Bias	4-15
		Scanning Lamp (FL1)	4-7	3.	Controlling the Transfer Bias
	6.	Controlling the Fluorescent			to a Constant Voltage	4-15
		Lamp Heater	4-8	4.	Controlling the Transfer Bias
	7.	Fluorescent Lamp Automatic ...	4-9		Voltage Level Correction
	8.	Fluorescent Lamp Protection			(ATVC control)	4-15
		Mechanism	4-9	5.	Current Limiter Circuit
	D. Controlling the Primary Charging				(transfer bias)	4-15
	Roller Bias		4-10	6.	Current Limiter Circuit
	1.	Outline	4-10		(cleaning bias)	4-15
	2.	Turning On and Off the Primary		F. Controlling the Static Eliminator
		Charging Roller Bias	4-11	Bias		4-16

CANON NP6218 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIMÉ AU JAPON)