Canon CP660, Service Manual

Page: 97 / 407

COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
This chapter provides descriptions on the machine’s image processing operations,
functions of each operation, relationships between electrical and mechanical systems,
and timing at which each associated part is turned on.
CHAPTER 4
IMAGE FORMATION SYSTEM
I. OUTLINE..................................................4-1
A. Construction .......................................4-1
B. Operations..........................................4-2
II. FORMING LATENT STATIC IMAGES......4-5
A. Outline................................................4-5
B. Drum Cartridge Memory ....................4-6
C. Checking the Life of the Photosensitive
Drum ..................................................4-8
D. Monitoring the Waste Toner Case......4-9
III. DEVELOPMENT ....................................4-10
A. Outline..............................................4-10
B. Controlling the Developing Rotary ...4-12
C. Locking the Developing Rotary ........4-14
D. Detecting the Absence of the Toner
Cartridges ........................................4-14
E. Detecting the Level of Color Toner...4-16
F.
Checking the Presence/Absence of a
Color Toner Cartridge.......................4-17
G. Checking the Level of Black Toner and
the Presence/Absence of the Black
Toner Cartridge ................................4-17
IV. TRANSFER............................................4-18
A. Outline..............................................4-18
B. Locking the Secondary Transfer
Belt ...................................................4-19
C. Controlling the ITD Cleaning
Roller................................................4-20
V. IMAGE STABILIZATION CORRECTION
CONTROL..............................................4-21
A. Environmental Changes Correction
Control .............................................4-21
B. Image Density Correction Control (maxi-
mum density control)........................4-21
C. Image Gradation Correction Control
(requires a PS/PCL Board) ..............4-22
D. Detecting the Density.......................4-23
VI. HIGH-VOLTAGE POWER SUPPLY
CIRCUIT.................................................4-24
A. Outline..............................................4-24
B. High-Voltage PCB 1 .........................4-26
C. High-Voltage PCB 2 .........................4-30
D. Separation Static Eliminating Bias
PCB..................................................4-33
VII. OTHER CONTROL MECHANISMS.......4-34
A. Developing Rotary Motor Control ....4-34
B. Controlling the Cartridge Motor .......4-36
C. Controlling the Drum Motor..............4-37
VIII. DISASSEMBLY/ASSEMBLY ..................4-38
A. Drive System....................................4-39
B. Charging, Developing, and
Cleaning ...........................................4-45
C. PCBs ................................................4-53
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