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OPERATIONS
AND
TIMING
Period
Purpose
Remarks
AER
(AE
rotation)
From
when
the
scanner
moves
forward
about 70
mm
from
the
end
of
the
image
until
it
returns
to
its
home
position.
Move
the
scanner
for-
ward
about
70
mm
from
the
end
of
the
image
and
measure
the
docu-
ment
density.
In
the
non-AE mode,
the
scanner does
not
move
forward
or
in
reverse.
SCFW
(Scanner
Forward)
When
the
scanner
is
moving
forward
•
Travel distance
changes
with
copy
paper
size.
Scanning lamp
illumi-
nates
original,
and
ref-
lected optical
image
is
transmitted
to
photo-
sensitive
drum
through
mirrors
and
lens
array.
•A REGISTRATION
sig-
nal
is
generated,
and
copy paper
is
fed
to
transfer area.
•
A
PAPER FEED
signal
is
generated
to
feed
next
sheet
of
copy
paper.
SCRV
(Scanner
reverse)
While
the
scanner
is
moving
in
reverse
•
The
speed
of
the
re-
verse
movement
is
2.5 times
that of
the
forward
movement.
Scanner
is
moved
back
to
HOME
position
to
pre-
pare
for
next
copy
LSTR
(LAST
rotation)
Untill
the
main motor
stop
after
SCRV
for last
copy ends
Ensures
full
ejection
of
last
copy
STBY
(STANDBY)
Waits
until
COPY;START
key
is
pressed
Table
3-1 (b)
3-10
COPYRIGHT©
1992
CANON
INC.
CANON
NP-1550 REV.O
JAN.1992 PRINTED
IN
JAPAN (IMPRIMEAUJAPON)
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