Canon NP6621 Service Manual page 79

From switch on until the fixing roller
WMUP (Warm-
Up) temperature reaches 165°C for the
black developer or 145°C for the CT
Unit. (about 75 seconds at an ambient
temperature of 20°C)
WMUPR (Warm- Until the fixing roller temperature
Up Rotation) reaches 175°C to 180°C for the black
developer or 155°C to 160°C for the CT
unit.
STBY (standby) • From when LSTR ends until when
the Copy Start key is pressed or the
power switch is turned OFF.
• From when the power switch is
turned ON until the Copy Start key is
pressed.
INTR For at least 1 sec after the Copy Start
(initial rotation) key is pressed.
AER
(AE rotation)
SCFW While the scanner is moving forward.
(scanner forward) • The distance traveled forward
depends on the cassette size and the
reproduction ratio.
• The speed for forward travel
depends on the selected
reproduction ratio.
SCRV While the scanner is moving in reverse.
(scanner reverse)
LSTR From when SCRV ends until when the
(last rotation) copy paper moves past the delivery
sensor.
COPYRIGHT © 1998 CANON INC.
Period
Table 3-101
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
OPERATIONS AND TIMING
Function
Allows time for fixing
roller to warm up.
Keeps fixing roller
temperature uniform.
Stabilizes drum
sensitivity to prepare for
copying.
Waits for a press on an
operation key (e.g.,
Copy Start key).
Stabilizes the drum
sensitivity in preparation
for copying operation.
Moves the scanner
forward/in reverse about
65 mm to measure the
density of the original.
Illuminates the original
by the scanning lamp,
and the reflected optical
image is projected on
the photosensitive drum
through mirrors and
lenses.
Returns the scanner to
the home position in
preparation for the next
copying operation.
Removes charges from
the surface of the
photosensitive drum as
post copying
processing.
Remarks
Warm-up time varies
with fixing roller
temperature at power
ON. When the COPY
START key is lighting
green.
• After the WMUPR
period ends, the
READY/WAIT
indicator changes
from orange to green.
• Even when the fixing
roller has warmed up,
it rotates for at least
3.5 seconds.
• 2 min or more after
LSTR ends, the
display on the control
panel switches to
standard mode.
AE mode only.
The registration signal is
generated and the copy
paper is fed to the
transfer assembly.
Discharges the last
copy.
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