Specifications

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON DADF-J1 REV.0 MAR.2001
CHAPTER 2 OPERATIONS AND TIMING
2-19
2.3.4 Original Size Detection 2
a. Outline
In original size detection 2, the original width detecting switch (SW301) and the registra-
tion roller clock sensor (PI5) are used to identify a default size.
The original width detecting switch is designed to find out the width of originals. As
many as five contact plates (SSW0 through 4) are in contact with the original width detect-
ing switch, operating in keeping with the slide guide. The state (ON or OFF) of each contact
plate is communicated to the ADF controller PCB, which uses the input to determine the
width of the original.
The following table shows the states of the contact plates in relation to default sizes; the
states other than those indicated are assumed to indicate the presence of an original which is
not of a default size.
F02-203-04
Slide guide
ADF controller PCB
ON/OFF
Original width
detecting switch (SW301)
T02-203-03 (States of Switches)
Default size
A5, A4R
A4, A3
B5R
B5, B4
STMT, LTRR, LGL
LTR, 279.4 x 431.8mm (11" x 17")
SSW0
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
SSW1
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
SSW2
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
ON
SSW3
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
SSW4
ON
ON
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF