Casseette Feed; Two Consecutive A4/Letter Size Prints - Canon LBP-CX Series Service Manual

2. Cassette feed
Time (sec.)
Sequence
Main motor
(DRMD)
Cassette pickup roller _ _
PANT
comes TRUE
i
0
INTR
clutch !IOlenoid SL3 (CPUSD)
1 - - - - - -
Registration shutter solenoid
SL1 (RGSD)
Pickup sensor PS1 (PFS)
5
10
Delivery sensor PS3 ( P D P ) I - - - - - - - - - - - - - - -
15
20 25
20
PRINT
LSTR STBY
160°C
Fixing roller temperature
160
0
C 17 0
°
c
l...'-;;;..;;......;;..J'-----------------------------..._----~
Figure 2-26 Two consecutive A4/Letter size prints
The signals which drive the cassette pickup roller
clutch solenoid (SL3) and the registration shutter
solenoid (SLl) are generated by the microcomputer
on the DC controller. The microcomputer begins
counting TG signals (which are synchronous with
main motor rotation) as soon as a TRUE PRNT com-
mand is transmitted. Based on the count, the
microcomputer sends d.rive signals to control SL3 and
SLl.
When the DC controller receives a TRUE PRNT
command froth the external device, the DC controller
outputs a TRUE DRUM DRIVE command (DRMD)
and actuates the main motor. The DC controller
energizes the pickup roller clutch solenoid for about
0.9 seconds by outputting a TRUE CASSETTE
PICKUP ROLLER CLUTCH SOLENOID command
(CPUSD). At this time, the cassette pickup rollers
make one rotation, pickup a sheet of paper from the
cassette, and transport it via the cassette feed rollers
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 :regis-
tration shutter solenoid for 0.5 seconds. Then 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.
COPYRIGHT
©
BY CANON INC. CANON LBP-CX SERIES REV.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONJ
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