Canon PC720 Service Manual - Page 57

Image, Formation, System

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OPERATIONS AND TIMINGISM III. IMAGE FORMATION SYSTEM A. Outline The copier's image formation system performs the following functions: • controls the scanning lamp. • controls the primary/transfer corona current. • controls the developing bias. • measures the density of the original. • controls blank exposure. Copyboard glass \ \Scanning lamp Intensity sensor AE sensor Lens Blank exposure lamp Primary charging rollerj; Developing cylinder Photosensitive drum Z Drum cartridge Cartridge color detection Static eliminator Transfer roller Q101 Microprocessor DC controller PCB fluorescent lamp driver High-voltage circuit 4 O900 Microprocessor Composite power supply PCB Figure 3-301 COPYRIGHT 1994 CANON INC. CANON PC720114017501770 RE0.0 AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPAN) 3 - 17

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OPERATIONS
AND
TIMING
ISM
III.
IMAGE
FORMATION
SYSTEM
A.
Outline
The
copier's
image
formation
system
performs
the
following
functions:
•
controls
the
scanning
lamp.
•
controls
the
primary/transfer
corona
current.
•
controls
the
developing
bias.
•
measures
the
density
of
the
original.
•
controls
blank
exposure.
Copyboard
glass
\\
Scanning
lamp
Intensity
sensor
AE
sensor
Lens
Blank
exposure
lamp
Primary
charging
rollerj;
Developing
cylinder
Cartridge
color
detection
Static
eliminator
Q101
Microprocessor
DC
controller
PCB
Photosensitive
drum
Z
Drum
cartridge
Transfer
roller
fl
uorescent
lamp
driver
4
O900
Microprocessor
High
-voltage
circuit
Composite
power
supply
PCB
Figure
3-301
COPYRIGHT
1994
CANON
INC.
CANON
PC720114017501770
RE0.0
AUG.1994
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPAN)
3
-
17