Auxiliary Feed; Two Consecutive Legal-Size Prints - Canon LBP-CX Series Service Manual

3. Auxiliary fel!d (manual feed)
Time (sec.)
Sequence
Main motor (DRMD)
Manual pickup roller
solenoid SL2 (MPUSD)
Registration shutter
solenoid SL 1 (RGSD)
Pickup sensor PS1 (PFS)
Delivery sensor PS3 (PDP)
Fixing roller temperature
PANT
comes TRUE
i
0
..
STBYI
150-c1
5 10
v
"
INTR
I
-
I
15 20
25
30 35
-
.. ..
.
-
PRINT
I LSTR
ISTB-Y
-
•
180
c
!160u(
Figure 2-27 Two consecutive legal-size prints
The control signals for the manual pickup roller
solenoid (SL2) and the registration shutter solenoid
(SLl) are generated by the microcomputer on the DC
controller. When a TRUE PRNT command is received
by the DC controller and there is paper set in the
manual feed tray, the microcomputer actuates the
main motor and begins counting the TG signals
produced in sync with main motor rotation. Based on
the counted TG signals, the microcomputer generates
the signals which control the manual pickup roller
solenoid and the registration shutter solenoid.
Upon receiving a true PRINT command from the
external device, the DC controller checks the pickup
sensor signal (PFS) to detect whether there is paper
on the manual feed tray. If paper is ready, the DC
controller outputs a TRUE DRUM DRIVE command
(DRMD) and actuates the main motor. Then the DC
controller outputs a TRUE MANUAL PICKUP
ROLLER SOLENOID DRIVE command (MPUSD)
(timing as shown in Fig. 2-27), thus energizing the
manual pickup roller clutch solenoid for about 2
seconds. One sheet of paper is transported toward
the registration shutter. Since the registration shutter
is closed at this time, the paper strikes it and stops.
When the paper is aligned with the leading edge
of the image on the drum, the DC controller outputs
a TRUE REGISTRATION SHUTTER SOLENOID
DRIVE command (RGSD) and energizes the registra-
tion shutter solenoid for 0.5 seconds. The registration
shutter is raised and the paper is moved into contact
with the drum. After transfer, the paper is separated
from the drum by the separation belt, carried by the
feeder rollers into the fixing assembly, and delivered
to the print tray by the delivery rollers.
Note:
In auxiliary feed (manual) mode, the process time of
PRINT does not vary with paper size. The process
time is that for legal-size paper.
The process time for INTR is 4 seconds longer than
for cassette feed, increasing the fixing temperature
by 10°
c
more than for cassette feed, thus ensuring
proper image fixing on thick paper.
2-16
COPYRIGHT
©
BY CANON INC. CANON LBP-CX SERIES REV.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONJ