Canon NP6045 Service Manual page 109

IMAGE FORMATION SYSTEM
This chapter discusses the principles of how images are formed. It also explains the timing at which
the various units involved in image formation are operated, and shows how they may be
disassembled/assembled and adjusted.
I. PROCESSES .....................................4-1
A. Controlling the Surface Potential
of the Drum....................................4-1
B. Controlling the Scanning Lamp
Intensity .........................................4-6
C. Controlling the Primary/Transfer
Corona Current..............................4-10
D. Controlling the Separation/Pre-
Transfer Corona Current ...............4-13
E. Controlling the Blank Exposure
Lamp (LEDs) .................................4-17
F. Drum Heater Circuit.......................4-20
G. Cleaning the Primary Charging
Wire ...............................................4-23
H. Cleaning the Pre-Transfer,
Transfer, and Separation
Charging Wires Automatically .......4-24
II. DEVELOPING ASSEMBLY AND
CLEANING ASSEMBLY .....................4-26
A. Outline ...........................................4-26
B. Detecting the Toner Level and
Controlling the Supply Operation ..4-27
COPYRIGHT © 1997 CANON INC.
CHAPTER 4
CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
C. Controlling the Developing
Bias/Roller Electrode .....................4-29
D. Detecting the Locking of the
Waste Toner Feeding Screw .........4-35
III. DISASSEMBLY AND ASSEMBLY......4-36
A. Scanning Lamp .............................4-36
B. Standard White Plate Assembly....4-38
C. Pre-Exposure Lamp Unit ...............4-40
D. Blank Exposure Lamp Assembly ..4-41
E. Photosensitive Drum .....................4-42
F. Potential Sensor Assembly ...........4-44
G. Primary Charging Assembly..........4-45
H. Pre-Transfer Charging Assembly ..4-45
I. Transfer/Separation Charging
Assembly .......................................4-46
J. Charging Wire ...............................4-49
K. Developing Assembly ....................4-55
L. Hopper Assembly ..........................4-60
M. Drum Cleaner ................................4-61
N. Separation Claw/Separation
Claw Drive Assembly ....................4-65
O. Waste Toner Feeding Assembly....4-66