Specifications

2001 CANON INC. 2000 2000 2000 2000 CANON DADF-J1 REV.0 MAR.2001

CHAPTER 2 OPERATIONS AND TIMING

2-18

2.3.3 Original Size Detection 1

In original size detection 1, the original trailing edge sensor is used (S7), which is de-

signed to identify the original in the original tray as being small-size or large-size.

When the original covers the original trailing edge sensor, the light from the LED of the

original trailing edge sensor is reflected by the original to hit the phototransistor, at which

time the DADF identifies the original as being large-size.

The DADF sends original size data (small-size or large-size) to the copier, which uses the

data to determine the point at which the scanner is stopped for stream reading.

Small size: A5, A4, B5, STMT, LTR

Large-size: A4R, B5R, A3, B4, LTRR, LGL, 279.4x431.8 mm (11"x17")

T02-203-02

F02-203-03

ADF controller PCB

If the original is identified

as being large-size

If the original is identified

as being small-size

ADF controller PCB

Reflected light detected Reflected light absent

S7 S7

Original Original

TAILS