Canon DADF-Q1 Service Manual page 34

Chapter 2
Default size
B5, B4
STMT, LTRR, LGL
LTR, 279.4X431.8mm (11"X17")
The registration roller clock sensor (PI5) is used to measure the length of originals with reference to the revolutions made by the clock plate mounted to the slave
roller of the registration roller. Based on the revolutions of the lock plate, the ADF controller PCB identifies the length of the original in question (in feeding direc-
tion).
The DADF uses the data on the width and the length of the original obtained by original detection 2 to identify a default size, and sends the result to the copier. In
response, the copier selects the appropriate copy paper size to suit the identified size of the original.
The following tables show the default sizes in relation to the sizes detected by the DADF:
A- and A/B-Configuration
Default size
B5R
A5
A4R
FOOLSCAP
B5
B4
A4
A3
A size outside of the above ranges will be identified as a non-default size.
2-12
SSW0
ON
ON
ON
ON
ON
ON
ADF controller PCB
Registration roller
Slave roller
Original length
237 to 297
129 to 189
277 to 317
317 to 370
162 to 222
344 to 404
190 to 250
400 to 460
SSW1 SSW2
OFF ON
OFF ON
ON ON
ON OFF
ON OFF
ON ON
Registration roller
clock sensor (PI5)
Clock plate
F-2-17
T-2-4
Original width
177 to 187
205 to 213
252 to 262
292 to 302
T-2-5
SSW3 SSW4
OFF ON
OFF OFF
OFF ON
OFF ON
OFF OFF
OFF OFF
(unit: mm)