Canon PC720 Service Manual - Page 54

Scanner, Drive, System

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®OPERATIONS AND TIMING M lngEkkaSakt il C. Scanner Drive System 1. Outline The scanner drive system is driven by the scanner motor (M2), which changes its direction of rotation so that the scanner moves forward or in reverse. The revolution at which the scanner is moved forward changes continuously according to the selected reproduction ratio, and the revolution at which the scanner is moved in reverse remains constant regardless of the selected reproduction ratio (about 3.4 times as fast as in forward in DIRECT). The distance over which the scanner travels varies according to the length of copy paper and the selected reproduction ratio. The scanner motor drives the lens drive system in addition to the scanner system. M2 PSI lightblocking plate Scanner home position (SCHP) Scanner home position sensor (PSI) O 2 O O c9 O co (ID rn rn rn O Q1O9 Figure 3-205 Motor driver circuit DC controller PCB 3 - 14 COPYRIGHT © 1994 CANON INC. CANON PC729R4017501170 REV.O AUG. 1994 PRINTED IN JAPAN (IMPRIME AU JAPON)

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®OPERATIONS
AND
TIMING
M
lngEkkaSakt
il
C.
Scanner
Drive
System
1.
Outline
The
scanner
drive
system
is
driven
by
the
scanner
motor
(M2),
which
changes
its
direction
of
rotation
so
that
the
scanner
moves
forward
or
in
reverse.
The
revolution
at
which
the
scanner
is
moved
forward
changes
continuously
according
to
the
selected
reproduction
ratio,
and
the
revolution
at
which
the
scanner
is
moved
in
reverse
remains
constant
regardless
of
the
select-
ed
reproduction
ratio
(about
3.4
times
as
fast
as
in
forward
in
DIRECT).
The
distance
over
which
the
scanner
travels
varies
according
to
the
length
of
copy
paper
and
the
selected
reproduction
ratio.
The
scanner
motor
drives
the
lens
drive
system
in
addition
to
the
scanner
system.
M2
PSI
light
-
blocking
plate
Scanner
home
position
(SCHP)
Scanner
home
position
sensor
(PSI)
O
co
O
(ID
2
O
rn
c9
rn
O
O
rn
Q1O9
Motor
driver
circuit
DC
controller
PCB
Figure
3-205
3
-
14
COPYRIGHT
©
1994
CANON
INC.
CANON
PC729R4017501170
REV.O
AUG.
1994
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPON)