Pick-Up/Delivery - Canon LBP-1210 Service Manual

CHAPTER 2
B. Pick-up/delivery
The main motor (M001) starts rotating in 0.5 seconds after the engine controller receives a print
command from the interface controller. This drives all the rollers other than the pick-up roller.
When the printer enters the initial rotation ready state (see Note), the pick-up solenoid
(SL001) is turned ON for 0.2 seconds. This transmits the main motor's rotational force to the
pick-up roller, thus rotates the roller. The roller's rotation also drives the pick-up cam. When
the pick-up cam's claw separates from the lifting plate with paper loaded, the plate is lifted by
the spring force, allowing the paper to be picked up by the pick-up roller. The paper is then
transported into the printer.
When the leading edge of the paper reaches the top of page sensor (PS402) and then a spec-
ified period of time passes, the engine controller sends the LASER BEAM DETECTION (/BD) sig-
nal to the interface controller. Based on this signal, the interface controller sends the VIDEO
signal to the laser/scanner unit, so an image is formed on the photosensitive drum. The lead-
ing edge of the image and that of the paper are aligned with each other by the /BD signal. Then,
the paper is delivered to the face-down tray by the rotations of the photosensitive drum, pres-
sure roller, face-up delivery roller, and face-down delivery roller.
Opening or closing the face-down cover manually selects either the face-down or face-up
delivery.
There are two photointerrupters, top of page sensor (PS402) and delivery paper sensor
(PS401) on the paper path to detect paper reaching and passing. If the paper does not reach or
pass each sensor within a specified period of time, the CPU on the engine controller determines
a paper jam and notifies it to the interface controller.
Note: Initial rotation ready
The state in which the fixing temperature has reached a specified value and the scan-
ner motor has reached a specified rev after a specifiedperiod, during main motor rota-
tion.
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