Canon CLBR 460ps Service Manual page 138

CHAPTER 2
2. Multi-purpose tray pick-up
a. Outline
The presence of the paper on the multi-purpose tray is sensed by the multi-purpose tray paper
sensor (PS4).
When it detects the home position (HP1) for the first color image formation after receiving the
PRINT signal (/PRNT), the DC controller drives the pick-up motor (M2).
After the prescribed period of time, the multi-purpose tray pick-up solenoid (SL1) is turned
ON to transmit the rotational force of the pick-up motor to the multi-purpose tray pick-up roller.
As the pick-up roller rotates, the pick-up cam pushes up the paper lifting plate. Thus, the paper
is pressed against the pick-up roller and picked up by its rotation. After the paper is separated
from any extra sheets by the separation pad, it is fed into the printer. The subsequent opera-
tions are as described for cassette feeding.
Feed PCB
M2: Pick-up motor
SL1: Multi-purpose tray pick-up solenoid
CL1: Registration clutch
This printer performs a pick-up retry function only when the paper is picked up from the multi-
purpose tray for full-color printing.
After the pick-up operation, if the registration paper sensor cannot detect the leading edge of
2 - 80
DC controller PCB
Multi-purpose tray PCB
PS2
PS301
PS302
CL1
M2
Figure 2-5-4
SL1
Multi-purpose
tray pick-up
PS3
roller
Paper lifting
plate
PS4
PS2: Registration paper sensor
PS3: Last paper sensor
PS4: Multi-purpose tray paper sensor
PS301: OHT sensor(left)
PS302: OHT sensor(right)