Canon DADF-B1 Service Manual page 22

· Inch/A/B-Configured ADF
Default size Length (mm)
B5R 237 to 297
A5 128 to 188
A4R 277 to 337
STMT 120 to 180
LTRR 259 to 309
FLSC 310 to 343
LGL 343 to 396
B5 162 to 222
B4 344 to 404
LTR 196 to 256
COMPUTER 361 to 411
11x17 412 to 472
(297.4 to 431.8)
A4 190 to 250
A3 400 to 460
A default size is identified in reference to
±10 mm for the length of an original, and ±5
mm for the width. Any lengths or widths
falling outside these ranges will be assumed to
represent a non-default size original.
Table 2-203
c. Identifying the last Original
A copier with a long paper path (from
cassette to drum) is designed to pick up copy
paper early to enable faster copying operation.
As such, when the ADF picks up the last
original and places it on the copyboard glass,
the copier may already have finished picking
up copy paper.
The ADF moves the second original as far
as the pre-registration sensor immediately after
it picks up the first original (advance
separation). If the last original sensor does not
detect an original, the ADF controller will
COPYRIGHT © 1999 CANON INC. CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
assume the original as the last original and
sends the last original detection signal (LAST)
to the copier so as to prevent pickup of copy
Width (mm)
paper.
180 to 184
208 to 212
213.9 to 217.9
255 to 259
277.4 to 281.4
Prism
295 to 299
CHAPTER 2 BASIC OPERATION
Last Original Detection and Original Sizes
default size: B5, A4, LTR
length: 170 to 190 mm; 205 to
226 mm
ADF controller PCB
Pre-registration
sensor
U504
U502
Figure 2-206
Last original sensor
Original tray
Figure 2-207
Original
Last original sensor
Original
2-9