Canon PC720 Service Manual - Page 53

Drive, System

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OPERATIONS AND TIMINGINN B. Lens Drive System 1. Outline The lens drive system is driven by the scanner motor (M2). When the lens solenoid (SL3) turns on, the switching gear is pushed in the direction of the arrow c>. When the scanner motor rotates in reverse ( 4%) in this condition, the lens unit moves in REDUCE direction by the work of gears and lens cable. At the same time, the No. 4/5 mirror unit moves according to the travel (reproduction ratio) of the lens unit, changing the length of the optical path. At this time, the blank exposure lamp also moves in relation to the lens to perform black erasure at the front and the rear. SL3 ON Switching gear SL3 OFF Switching gear 0 0 (lens being driven) Switchin. gea SL3 Lens cable 0 0 (scanner being moved) Top View Cam Scanner motor(M2) No. 4/5 mirror unit REDUC signal (LNSLD*) 0 :42 0 .= ,$) :0e CO CO J to ENLARGE Lens home position Lens unit sensor (PS2) Lens travel detecting shaft for side blank exposure lamp DC controller PCB Figure 3-203 COPYRIGHT © 1994 CANON INC. CANON PC7201740f750M0 AEU AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPAN) 3 - 13

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OPERATIONS
AND
TIMING
INN
B.
Lens
Drive
System
1.
Outline
The
lens
drive
system
is
driven
by
the
scanner
motor
(M2).
When
the
lens
solenoid
(SL3)
turns
on,
the
switching
gear
is
pushed
in
the
direction
of
the
arrow
c>.
When
the
scanner
motor
rotates
in
reverse
(
4
%)
in
this
condition,
the
lens
unit
moves
in
REDUCE
direction
by
the
work
of
gears
and
lens
cable.
At
the
same
time,
the
No.
4/5
mirror
unit
moves
according
to
the
travel
(reproduction
ratio)
of
the
lens
unit,
changing
the
length
of
the
optical
path.
At
this
time,
the
blank
exposure
lamp
also
moves
in
relation
to
the
lens
to
perform
black
erasure
at
the
front
and
the
rear.
signal
(LNSLD*)
,$)
0
SL3
ON
Switching
gear
0
(lens
being
driven)
Switchin.
gea
Lens
cable
0
:
4
2
0
.=
0
:e
CO
CO
J
to
SL3
0
SL3
OFF
Switching
gear
0
(scanner
being
moved)
Top
View
Cam
Scanner
motor(M2)
No.
4/5
mirror
unit
ENLARGE
Lens
home
position
Lens
unit
sensor
(PS2)
DC
controller
PCB
REDUC
Lens
travel
detecting
shaft
for
side
blank
exposure
lamp
Figure
3-203
COPYRIGHT
©
1994
CANON
INC.
CANON
PC7201740f750M0
AEU
AUG.1994
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPAN)
3
-
13