Canon LBP-1120 Service Manual page 51

Laser beam printer
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CHAPTER 2
After the specified period of time from the time the paper reaches the paper top sensor (PS002), the engine controller
sends the /BD signal to the interface controller. The interface controller sends the VIDEO signal to the engine controller
based on the /BD signal. This matches the leading edge of the image with that of print paper. The paper goes through
the transfer, separation, fixing, and delivery blocks, and is delivered to the faceup delivery slot or to the facedown tray.
Turning the delivery lever up and down switches into the faceup delivery (turn down the lever) or facedown delivery
(turn up the lever).
There are two photointerrupters (PS002 and PS201) on the paper path. These photointerrupters detect paper's reach
and pass.
If the paper does not reach or pass the sensors within the specified period of time, the CPU on the engine controller
determines a paper jam and notifies it to the interface controller.
In this printer, print paper is loaded from the top of the printer. This may cause paper pickup failures. To prevent
this, the printer contains a pickup retry function. If the paper top sensor does detect the leading edge of paper within the
specified period of time after the pickup solenoid turns ON, instead of determining a jam, the printer tries to pickup the
paper again. The printer performs the pickup retry up to twice. If the paper top sensor cannot detect the leading edge
of the paper within the specified period of time in the third trial, the printer determines that a paper pickup delay jam has
occurred.
Note:
Initial rotation ready
The state in which the main motor is rotating, the fixing unit temperature has reached its specified
value in a specified period of time after the start of main motor rotation, and the scanner motor has
reached its specified rotation speed.
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