Pick-Up/Feed System; Outline - Canon LBP-1000 Service Manual

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CHAPTER 2
V. PICK-UP/FEED SYSTEM
A. Outline
Presence of paper on the multi-purpose tray is detected by the multi-purpose tray paper sensor
(PS504). Presence of paper in the cassette is detected by the cassette paper sensor (PS501).
When a print instruction command is input to the engine controller from the video controller,
the main motor (M1001) and scanner motor start rotating and the fixing heater temperature
control starts.
The cassette pick-up solenoid (SL501) or multi-purpose tray pick-up solenoid (SL502) is
turned ON when the following three requirements are met.
1) After the main motor has been driven for 0.5 seconds.
2) In case of paper pick-up from the cassette, after the scanner motor has reached 80% of the
specified rotation number for 0.6 seconds, and for 1.1 seconds in case of paper pick-up from
the multi-purpose tray.
3) The fixing heater temperature has been brought to the specified temperature by the initial
temperature control, or the specified period of time has elapsed after start of the tempera-
ture control.
In case of paper pick-up from the cassette, SL501 is turned ON, and the rotation of the main
motor is transmitted to the cassette pick-up roller. The cassette pick-up roller makes a rotation,
and paper in the cassette is picked up. In case of paper pick-up from the multi-purpose tray,
SL502 is turned ON, and the tray cam rotates to lift the tray loaded with paper so that the paper
makes contact with the multi-purpose tray pick-up roller. At the same time, the multi-purpose
tray pick-up roller makes a rotation to pick-up a sheet of paper from the multi-purpose tray.
The paper is separated from any excessive sheets of paper by the separation pad and fed to
the registration roller.
Paper pick-up timing
Print instruction command
Main motor (M1001)
Scanner motor
Cassette pick-up solenoid (SL501)
Multi-purpose tray pick-up solenoid (SL502)
Top-of-page sensor (PS502)
Fixing heater
2 - 32
STBY
INTR
80% of the specified rotation number
0.6
Figure 2-5-1
(Unit: second)
PRINT
1.1

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