Canon FY8-13EX-000, NP6218 service manual PICK-UP/FEEDING System, Vii

1.	Outline	4-16
2.	Switching the Static Eliminator
	Bias Voltage Level	4-17
3.	Ensuring Proper Separation of
	Thin Paper	4-17
G. Controlling Blank Exposure		4-18
1.	Outline	4-18
2.	Blanking (Whiting) of Non-
	Image Areas for Reduction	4-19

3.Blanking (Whiting) Out the Leading/Trailing Edges and

	between Copies	4-19
H. Controlling the Primary Corona
Roller Cleaning Mechanism		4-20
1.	Outline	4-20
2.	Primary Charging Roller
	Cleaning Operation	4-20
I. Releasing the Transfer Roller		4-21
1.	Outline	4-21

II.DEVELOPING ASSEMBLY AND

CLEANING ASSEMBLY	4-22
A. Outline	4-22
B. Controlling the Toner Level
Detection	4-23
C. Controlling the Development
Bias	4-25
1. Outline	4-25

2.Turning On and Off the DC Component of the Developing Bias and Controlling the

Voltage to a Constant Level .....4-25

3.Turning On and Off the AC Component of the

Development Bias 4-26

4.Controlling the Voltage Level of the DC Component of the

	Development Bias	4-26
D. Automatic Control of Copy
Density		4-27
1.	Outline	4-27
2.	Control Method	4-27
3.	AE Adjustment	4-29

III. DISASSEMBLY AND ASSEMBLY	4-30
A. Illumination Assembly	4-30
1. Detaching the Scanning
Lamp/Fluorescent Lamp

Heater 4-30

2.Points to Note When Attaching the Fluorescent Lamp

	Heater/Scanning Lamp	4-32
3.	Detaching the Blank Exposure
	Assembly	4-34
4.	Detaching the Blank Exposure
	Lamp	4-35
5.	Detaching the Blank Shutter
	Solenoid	4-36
6.	Positioning the Blank Shutter
	Solenoid	4-37
7.	Routing the Blanking Cable	4-38
8.	Positioning the Left/Right
	Margin	4-38
B. Drum Unit		4-39
1.	Detaching the Drum Unit	4-39
2.	Cleaning	4-40
C. Primary Corona Assembly		4-41
1.	Detaching the Primary Corona
	Assembly	4-41
2.	Cleaning the Cleaning Pad and
	the Primary Corona Roller	4-42
3.	Positioning the Solenoid for the
	Primary Charging Roller	4-43
D. Transfer Charging Assembly		4-44
1.	Detaching the Transfer Roller ...	4-44
2.	Attaching the Drum Heater	4-44
E. Developing System		4-47
1.	Removing the Developing
	Assembly	4-47
2.	Removing the Blade
	Assembly	4-47
3.	Removing the Developing
	Cylinder Side Seal	4-48
4.	Installing the Side Seal and
	the Blade Assembly	4-51

CHAPTER 5 PICK-UP/FEEDING SYSTEM

I.	PICK-UP/FEEDING SYSTEM	5-1	IV.	MULTIFEEDER	5-7
	A. Outline	5-1		A. Outline	5-7
II.	PICK-UP OPERATION (COPIER)	5-3		B. Identifying the Size of Paper on
	A. Outline	5-3		the Multifeeder	5-8
	B. Sequence of Operations (pick-up/			C. Sequence of Operations
	feeding assembly; A4, 2 copies)....	5-4		(multifeeder; A4, 2 copies)	5-9
III.	PICK-UP FROM THE CASSETTE		V.	IDENTIFYING THE CASSETTE
	FEEDING MODULE-A2	5-5		SIZE	5-10
	A. Pick-Up Operation	5-5	VI.	IDENTIFYING JAMS	5-12
	B. Sequence of Operations			A. Pre-Registration Delay Jam	5-12
	(cassette 2; A4, 2 copies)	5-6		B. Pre-Registration Timing Jam	5-13

COPYRIGHT © 1997 CANON INC. CANON NP6218 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIMÉ AU JAPON) vii