Detecting The Size Of Paper; Pickup From The Manual Feed Tray; Outline - Canon imageCLASS D600s Service Manual

5.2.1.2 Retry Pickup
If the paper leading edge sensor (PS102) does not detect paper within a specific period of
time after the cassette pickup roller has started to rotate, the machine will start to rotate the
cassette pickup roller once again to execute a retry pickup operation.
If the paper leading edge sensor (PS102) still does not detect paper within a specific pe-
riod of time after the machine executes a retry pickup operation once, the machine will iden-
tify the condition as a jam and will indicate a jam message on the LCD of its control panel.

5.2.1.3 Detecting the Size of Paper

The machine detects the size of paper in the cassette in any of two ways: LGL size detec-
tion and non-LGL size detection.
LGL detection is performed by means of a LGL sensor (PS101). The legal size detection
mechanism is used to prevent picking up a subsequent sheet of paper before the trailing
edge of paper leaves the cassette, otherwise occurring if the pickup was let to occur at the
same time using other sizes when picking up LGL paper.
Non-LGL detection is performed using the paper leading edge sensor (PS102) based on
the length of paper. In fax mode, if paper of a size different from the size selected from the
control panel is placed, the DC controller will identify a paper size mismatch at the end of
printing and indicate a message on the LCD.
5.2.2

Pickup from the Manual Feed Tray

5.2.2.1 Outline

Paper is picked up from the manual feed tray under the control of the CPU on the DC
controller PCB and using the drive of the main motor (M1). When the manual feed pickup
solenoid (SL1) goes ON, the drive of the main motor (M1) is transmitted as far as the
manual pickup roller assembly to rotate the manual feed pickup roller.
The sheets of paper stacked in the pickup tray are lifted by the work of a spring and
forced against the pickup roller. Thereafter, a single sheet of paper is separated by the work
of the manual feed pickup roller and the separation pad, and is moved as far as the registra-
tion shutter.
COPYRIGHT © 2001 CANON INC.
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CANON imageCLASS D600s/PC1060s/PC1200s/iR1200s REV. 0 SEPT. 2001
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CHAPTER 4 OPERATION
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