Canon PC770 Service Manual - Page 50

preparation

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MINOPERATIONS AND TIMING Period Description Remarks STBY (standby) • Between when the power Waits until the Copy Start key switch is turned on and becomes valid. when the Copy Start key is pressed. • Between when LSTR is over and when the Copy Start key is pressed. INTR (initial rotation) For about 3.5 sec after the Copy Start key is pressed. • Removes the residual The pick-up signal is charges from the photo- generated, and the first sensitive drum and stabilizes sheet of copy paper is the sensitivity of the photo- picked up. sensitive drum in preparation for cpying operation. • Pre-heats the scanning lamp and makes preparations until the drive intensity becomes stabilized. SCFW (scanner forward) While the scanner is moving The scanning lamp illuminates The registration signal forward. the original, and the reflected is generated, and the • The distance traveled optical image is projected on copy paper is moved forward varies depending the photosensitive drum by to the transfer on the copy paper size and way of mirrors and lenses. assembly. reproduction ratio. • The speed of forward travel varies depending on the reproduction ratio. SCRV While the scanner is moving The scanner is returned to the If in continuous mode, (scanner reverse) in reverse. home position in preparation the pick-up signal is • The speed of reverse for the next copy run. generated, and copy travel is about 3.4 times as paper is picked up. fast as forward travel in DIRECT. LSTR (last rotation) For about 1 sec after SCRV The last copy paper is for the last copy is over. discharged. Table 3-101 3 - 10 COPYRIGHT 1994 CANON INC. CANON PC72017407501770 REV.0 AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON)

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MIN
OPERATIONS
AND
TIMING
Period
Description
Remarks
STBY
(standby)
•
Between
when
the
power
switch
is
turned
on
and
when
the
Copy
Start
key
is
pressed.
•
Between
when
LSTR
is
over
and
when
the
Copy
Start
key
is
pressed.
Waits
until
the
Copy
Start
key
becomes
valid.
INTR
(initial
rotation)
For
about
3.5
sec
after
the
Copy
Start
key
is
pressed.
•
Removes
the
residual
charges
from
the
photo-
sensitive
drum
and
stabilizes
the
sensitivity
of
the
photo-
sensitive
drum
in
preparation
for
cpying
operation.
•
Pre
-heats
the
scanning
lamp
and
makes
preparations
until
the
drive
intensity
becomes
stabilized.
The
pick-up
signal
is
generated,
and
the
first
sheet
of
copy
paper
is
picked
up.
SCFW
(scanner
forward)
While
the
scanner
is
moving
forward.
•
The
distance
traveled
forward
varies
depending
on
the
copy
paper
size
and
reproduction
ratio.
•
The
speed
of
forward
travel
varies
depending
on
the
reproduction
ratio.
The
scanning
lamp
illuminates
the
original,
and
the
reflected
optical
image
is
projected
on
the
photosensitive
drum
by
way
of
mirrors
and
lenses.
The
registration
signal
is
generated,
and
the
copy
paper
is
moved
to
the
transfer
assembly.
SCRV
(scanner
reverse)
While
the
scanner
is
moving
in
reverse.
•
The
speed
of
reverse
travel
is
about
3.4
times
as
fast
as
forward
travel
in
DIRECT.
The
scanner
is
returned
to
the
home
position
in
preparation
for
the
next
copy
run.
If
in
continuous
mode,
the
pick-up
signal
is
generated,
and
copy
paper
is
picked
up.
LSTR
(last
rotation)
For
about
1
sec
after
SCRV
for
the
last
copy
is
over.
The
last
copy
paper
is
discharged.
Table
3-101
3
-
10
COPYRIGHT
1994
CANON
INC.
CANON
PC72017407501770
REV.0
AUG.1994
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPON)